FEATURE: Set endpoint credentials directly from LlmModel. (#625)

* FEATURE: Set endpoint credentials directly from LlmModel.

Drop Llama2Tokenizer since we no longer use it.

* Allow http for custom LLMs

---------

Co-authored-by: Rafael Silva <xfalcox@gmail.com>

app/controllers/discourse_ai/admin/ai_llms_controller.rb

@@ -58,6 +58,8 @@ module DiscourseAi
           :provider,
           :tokenizer,
           :max_prompt_tokens,
+          :url,
+          :api_key,
         )
       end
     end

app/serializers/llm_model_serializer.rb

@@ -3,5 +3,5 @@
 class LlmModelSerializer < ApplicationSerializer
   root "llm"
 
-  attributes :id, :display_name, :name, :provider, :max_prompt_tokens, :tokenizer
+  attributes :id, :display_name, :name, :provider, :max_prompt_tokens, :tokenizer, :api_key, :url
 end

assets/javascripts/discourse/admin/models/ai-llm.js

@@ -3,11 +3,14 @@ import RestModel from "discourse/models/rest";
 export default class AiLlm extends RestModel {
   createProperties() {
     return this.getProperties(
+      "id",
       "display_name",
       "name",
       "provider",
       "tokenizer",
-      "max_prompt_tokens"
+      "max_prompt_tokens",
+      "url",
+      "api_key"
     );
   }
 

assets/javascripts/discourse/components/ai-llm-editor.gjs

@@ -33,7 +33,9 @@ export default class AiLlmEditor extends Component {
     const isNew = this.args.model.isNew;
 
     try {
-      await this.args.model.save();
+      const result = await this.args.model.save();
+
+      this.args.model.setProperties(result.responseJson.ai_persona);
 
       if (isNew) {
         this.args.llms.addObject(this.args.model);
@@ -61,7 +63,7 @@ export default class AiLlmEditor extends Component {
       <div class="control-group">
         <label>{{i18n "discourse_ai.llms.display_name"}}</label>
         <Input
-          class="ai-llm-editor__display-name"
+          class="ai-llm-editor-input ai-llm-editor__display-name"
           @type="text"
           @value={{@model.display_name}}
         />
@@ -69,7 +71,7 @@ export default class AiLlmEditor extends Component {
       <div class="control-group">
         <label>{{i18n "discourse_ai.llms.name"}}</label>
         <Input
-          class="ai-llm-editor__name"
+          class="ai-llm-editor-input ai-llm-editor__name"
           @type="text"
           @value={{@model.name}}
         />
@@ -85,6 +87,22 @@ export default class AiLlmEditor extends Component {
           @content={{this.selectedProviders}}
         />
       </div>
+      <div class="control-group">
+        <label>{{I18n.t "discourse_ai.llms.url"}}</label>
+        <Input
+          class="ai-llm-editor-input ai-llm-editor__url"
+          @type="text"
+          @value={{@model.url}}
+        />
+      </div>
+      <div class="control-group">
+        <label>{{I18n.t "discourse_ai.llms.api_key"}}</label>
+        <Input
+          class="ai-llm-editor-input ai-llm-editor__api-key"
+          @type="text"
+          @value={{@model.api_key}}
+        />
+      </div>
       <div class="control-group">
         <label>{{I18n.t "discourse_ai.llms.tokenizer"}}</label>
         <ComboBox
@@ -96,7 +114,7 @@ export default class AiLlmEditor extends Component {
         <label>{{i18n "discourse_ai.llms.max_prompt_tokens"}}</label>
         <Input
           @type="number"
-          class="ai-llm-editor__max-prompt-tokens"
+          class="ai-llm-editor-input ai-llm-editor__max-prompt-tokens"
           step="any"
           min="0"
           lang="en"

assets/stylesheets/modules/llms/common/ai-llms-editor.scss

@@ -29,4 +29,8 @@
     text-align: center;
     font-size: var(--font-up-1);
   }
+
+  .ai-llm-editor-input {
+    width: 350px;
+  }
 }

config/locales/client.en.yml

@@ -204,6 +204,8 @@ en:
         provider: "Service hosting the model:"
         tokenizer: "Tokenizer:"
         max_prompt_tokens: "Number of tokens for the prompt:"
+        url: "URL of the service hosting the model:"
+        api_key: "API Key of the service hosting the model:"
         save: "Save"
         saved: "LLM Model Saved"
 

db/migrate/20240514171609_add_endpoint_data_to_llm_model.rb

@@ -0,0 +1,8 @@
+# frozen_string_literal: true
+
+class AddEndpointDataToLlmModel < ActiveRecord::Migration[7.0]
+  def change
+    add_column :llm_models, :url, :string
+    add_column :llm_models, :api_key, :string
+  end
+end

lib/completions/dialects/chat_gpt.rb

@@ -8,14 +8,14 @@ module DiscourseAi
           def can_translate?(model_name)
             model_name.starts_with?("gpt-")
           end
-
-          def tokenizer
-            DiscourseAi::Tokenizer::OpenAiTokenizer
-          end
         end
 
         VALID_ID_REGEX = /\A[a-zA-Z0-9_]+\z/
 
+        def tokenizer
+          llm_model&.tokenizer_class || DiscourseAi::Tokenizer::OpenAiTokenizer
+        end
+
         def native_tool_support?
           true
         end
@@ -30,7 +30,7 @@ module DiscourseAi
         end
 
         def max_prompt_tokens
-          return opts[:max_prompt_tokens] if opts.dig(:max_prompt_tokens).present?
+          return llm_model.max_prompt_tokens if llm_model&.max_prompt_tokens
 
           # provide a buffer of 120 tokens - our function counting is not
           # 100% accurate and getting numbers to align exactly is very hard
@@ -38,7 +38,7 @@ module DiscourseAi
 
           if tools.present?
             # note this is about 100 tokens over, OpenAI have a more optimal representation
-            @function_size ||= self.class.tokenizer.size(tools.to_json.to_s)
+            @function_size ||= self.tokenizer.size(tools.to_json.to_s)
             buffer += @function_size
           end
 
@@ -113,7 +113,7 @@ module DiscourseAi
         end
 
         def calculate_message_token(context)
-          self.class.tokenizer.size(context[:content].to_s + context[:name].to_s)
+          self.tokenizer.size(context[:content].to_s + context[:name].to_s)
         end
 
         def model_max_tokens

lib/completions/dialects/claude.rb

@@ -10,10 +10,6 @@ module DiscourseAi
               model_name,
             )
           end
-
-          def tokenizer
-            DiscourseAi::Tokenizer::AnthropicTokenizer
-          end
         end
 
         class ClaudePrompt
@@ -26,6 +22,10 @@ module DiscourseAi
           end
         end
 
+        def tokenizer
+          llm_model&.tokenizer_class || DiscourseAi::Tokenizer::AnthropicTokenizer
+        end
+
         def translate
           messages = super
 
@@ -50,7 +50,8 @@ module DiscourseAi
         end
 
         def max_prompt_tokens
-          return opts[:max_prompt_tokens] if opts.dig(:max_prompt_tokens).present?
+          return llm_model.max_prompt_tokens if llm_model&.max_prompt_tokens
+
           # Longer term it will have over 1 million
           200_000 # Claude-3 has a 200k context window for now
         end

lib/completions/dialects/command.rb

@@ -10,14 +10,14 @@ module DiscourseAi
           def can_translate?(model_name)
             %w[command-light command command-r command-r-plus].include?(model_name)
           end
-
-          def tokenizer
-            DiscourseAi::Tokenizer::OpenAiTokenizer
-          end
         end
 
         VALID_ID_REGEX = /\A[a-zA-Z0-9_]+\z/
 
+        def tokenizer
+          llm_model&.tokenizer_class || DiscourseAi::Tokenizer::OpenAiTokenizer
+        end
+
         def translate
           messages = super
 
@@ -38,7 +38,7 @@ module DiscourseAi
         end
 
         def max_prompt_tokens
-          return opts[:max_prompt_tokens] if opts.dig(:max_prompt_tokens).present?
+          return llm_model.max_prompt_tokens if llm_model&.max_prompt_tokens
 
           case model_name
           when "command-light"
@@ -61,7 +61,7 @@ module DiscourseAi
         end
 
         def calculate_message_token(context)
-          self.class.tokenizer.size(context[:content].to_s + context[:name].to_s)
+          self.tokenizer.size(context[:content].to_s + context[:name].to_s)
         end
 
         def system_msg(msg)

lib/completions/dialects/dialect.rb

@@ -20,10 +20,6 @@ module DiscourseAi
             ]
           end
 
-          def available_tokenizers
-            all_dialects.map(&:tokenizer)
-          end
-
           def dialect_for(model_name)
             dialects = []
 
@@ -38,20 +34,21 @@ module DiscourseAi
 
             dialect
           end
-
-          def tokenizer
-            raise NotImplemented
-          end
         end
 
-        def initialize(generic_prompt, model_name, opts: {})
+        def initialize(generic_prompt, model_name, opts: {}, llm_model: nil)
           @prompt = generic_prompt
           @model_name = model_name
           @opts = opts
+          @llm_model = llm_model
         end
 
         VALID_ID_REGEX = /\A[a-zA-Z0-9_]+\z/
 
+        def tokenizer
+          raise NotImplemented
+        end
+
         def can_end_with_assistant_msg?
           false
         end
@@ -88,7 +85,7 @@ module DiscourseAi
 
         private
 
-        attr_reader :model_name, :opts
+        attr_reader :model_name, :opts, :llm_model
 
         def trim_messages(messages)
           prompt_limit = max_prompt_tokens
@@ -147,7 +144,7 @@ module DiscourseAi
         end
 
         def calculate_message_token(msg)
-          self.class.tokenizer.size(msg[:content].to_s)
+          self.tokenizer.size(msg[:content].to_s)
         end
 
         def tools_dialect

lib/completions/dialects/fake.rb

@@ -8,10 +8,10 @@ module DiscourseAi
           def can_translate?(model_name)
             model_name == "fake"
           end
+        end
 
-          def tokenizer
-            DiscourseAi::Tokenizer::OpenAiTokenizer
-          end
+        def tokenizer
+          DiscourseAi::Tokenizer::OpenAiTokenizer
         end
 
         def translate

lib/completions/dialects/gemini.rb

@@ -8,16 +8,16 @@ module DiscourseAi
           def can_translate?(model_name)
             %w[gemini-pro gemini-1.5-pro].include?(model_name)
           end
-
-          def tokenizer
-            DiscourseAi::Tokenizer::OpenAiTokenizer ## TODO Replace with GeminiTokenizer
-          end
         end
 
         def native_tool_support?
           true
         end
 
+        def tokenizer
+          llm_model&.tokenizer_class || DiscourseAi::Tokenizer::OpenAiTokenizer ## TODO Replace with GeminiTokenizer
+        end
+
         def translate
           # Gemini complains if we don't alternate model/user roles.
           noop_model_response = { role: "model", parts: { text: "Ok." } }
@@ -68,7 +68,7 @@ module DiscourseAi
         end
 
         def max_prompt_tokens
-          return opts[:max_prompt_tokens] if opts.dig(:max_prompt_tokens).present?
+          return llm_model.max_prompt_tokens if llm_model&.max_prompt_tokens
 
           if model_name == "gemini-1.5-pro"
             # technically we support 1 million tokens, but we're being conservative
@@ -81,7 +81,7 @@ module DiscourseAi
         protected
 
         def calculate_message_token(context)
-          self.class.tokenizer.size(context[:content].to_s + context[:name].to_s)
+          self.tokenizer.size(context[:content].to_s + context[:name].to_s)
         end
 
         def system_msg(msg)

lib/completions/dialects/mistral.rb

@@ -12,10 +12,10 @@ module DiscourseAi
               mistral
             ].include?(model_name)
           end
+        end
 
-          def tokenizer
-            DiscourseAi::Tokenizer::MixtralTokenizer
-          end
+        def tokenizer
+          llm_model&.tokenizer_class || DiscourseAi::Tokenizer::MixtralTokenizer
         end
 
         def tools
@@ -23,7 +23,7 @@ module DiscourseAi
         end
 
         def max_prompt_tokens
-          return opts[:max_prompt_tokens] if opts.dig(:max_prompt_tokens).present?
+          return llm_model.max_prompt_tokens if llm_model&.max_prompt_tokens
 
           32_000
         end

lib/completions/dialects/open_ai_compatible.rb

@@ -8,10 +8,10 @@ module DiscourseAi
           def can_translate?(_model_name)
             true
           end
+        end
 
-          def tokenizer
-            DiscourseAi::Tokenizer::Llama3Tokenizer
-          end
+        def tokenizer
+          llm_model&.tokenizer_class || DiscourseAi::Tokenizer::Llama3Tokenizer
         end
 
         def tools
@@ -19,7 +19,7 @@ module DiscourseAi
         end
 
         def max_prompt_tokens
-          return opts[:max_prompt_tokens] if opts.dig(:max_prompt_tokens).present?
+          return llm_model.max_prompt_tokens if llm_model&.max_prompt_tokens
 
           32_000
         end

lib/completions/endpoints/anthropic.rb

@@ -63,7 +63,9 @@ module DiscourseAi
         end
 
         def model_uri
-          @uri ||= URI("https://api.anthropic.com/v1/messages")
+          url = llm_model&.url || "https://api.anthropic.com/v1/messages"
+
+          URI(url)
         end
 
         def prepare_payload(prompt, model_params, dialect)
@@ -78,7 +80,7 @@ module DiscourseAi
         def prepare_request(payload)
           headers = {
             "anthropic-version" => "2023-06-01",
-            "x-api-key" => SiteSetting.ai_anthropic_api_key,
+            "x-api-key" => llm_model&.api_key || SiteSetting.ai_anthropic_api_key,
             "content-type" => "application/json",
           }
 

lib/completions/endpoints/aws_bedrock.rb

@@ -71,7 +71,8 @@ module DiscourseAi
             end
 
           api_url =
-            "https://bedrock-runtime.#{SiteSetting.ai_bedrock_region}.amazonaws.com/model/#{bedrock_model_id}/invoke"
+            llm_model&.url ||
+              "https://bedrock-runtime.#{SiteSetting.ai_bedrock_region}.amazonaws.com/model/#{bedrock_model_id}/invoke"
 
           api_url = @streaming_mode ? (api_url + "-with-response-stream") : api_url
 
@@ -91,7 +92,7 @@ module DiscourseAi
             Aws::Sigv4::Signer.new(
               access_key_id: SiteSetting.ai_bedrock_access_key_id,
               region: SiteSetting.ai_bedrock_region,
-              secret_access_key: SiteSetting.ai_bedrock_secret_access_key,
+              secret_access_key: llm_model&.api_key || SiteSetting.ai_bedrock_secret_access_key,
               service: "bedrock",
             )
 

lib/completions/endpoints/base.rb

@@ -60,9 +60,10 @@ module DiscourseAi
           end
         end
 
-        def initialize(model_name, tokenizer)
+        def initialize(model_name, tokenizer, llm_model: nil)
           @model = model_name
           @tokenizer = tokenizer
+          @llm_model = llm_model
         end
 
         def native_tool_support?
@@ -70,7 +71,11 @@ module DiscourseAi
         end
 
         def use_ssl?
-          true
+          if model_uri&.scheme.present?
+            model_uri.scheme == "https"
+          else
+            true
+          end
         end
 
         def perform_completion!(dialect, user, model_params = {}, feature_name: nil, &blk)
@@ -294,7 +299,7 @@ module DiscourseAi
           tokenizer.size(extract_prompt_for_tokenizer(prompt))
         end
 
-        attr_reader :tokenizer, :model
+        attr_reader :tokenizer, :model, :llm_model
 
         protected
 

lib/completions/endpoints/cohere.rb

@@ -42,7 +42,9 @@ module DiscourseAi
         private
 
         def model_uri
-          URI("https://api.cohere.ai/v1/chat")
+          url = llm_model&.url || "https://api.cohere.ai/v1/chat"
+
+          URI(url)
         end
 
         def prepare_payload(prompt, model_params, dialect)
@@ -56,7 +58,7 @@ module DiscourseAi
         def prepare_request(payload)
           headers = {
             "Content-Type" => "application/json",
-            "Authorization" => "Bearer #{SiteSetting.ai_cohere_api_key}",
+            "Authorization" => "Bearer #{llm_model&.api_key || SiteSetting.ai_cohere_api_key}",
           }
 
           Net::HTTP::Post.new(model_uri, headers).tap { |r| r.body = payload }

lib/completions/endpoints/gemini.rb

@@ -51,9 +51,16 @@ module DiscourseAi
         private
 
         def model_uri
-          mapped_model = model == "gemini-1.5-pro" ? "gemini-1.5-pro-latest" : model
-          url =
-            "https://generativelanguage.googleapis.com/v1beta/models/#{mapped_model}:#{@streaming_mode ? "streamGenerateContent" : "generateContent"}?key=#{SiteSetting.ai_gemini_api_key}"
+          if llm_model
+            url = llm_model.url
+          else
+            mapped_model = model == "gemini-1.5-pro" ? "gemini-1.5-pro-latest" : model
+            url = "https://generativelanguage.googleapis.com/v1beta/models/#{mapped_model}"
+          end
+
+          key = llm_model&.api_key || SiteSetting.ai_gemini_api_key
+
+          url = "#{url}:#{@streaming_mode ? "streamGenerateContent" : "generateContent"}?key=#{key}"
 
           URI(url)
         end

lib/completions/endpoints/hugging_face.rb

@@ -44,7 +44,7 @@ module DiscourseAi
         private
 
         def model_uri
-          URI(SiteSetting.ai_hugging_face_api_url)
+          URI(llm_model&.url || SiteSetting.ai_hugging_face_api_url)
         end
 
         def prepare_payload(prompt, model_params, _dialect)
@@ -53,7 +53,8 @@ module DiscourseAi
             .merge(messages: prompt)
             .tap do |payload|
               if !payload[:max_tokens]
-                token_limit = SiteSetting.ai_hugging_face_token_limit || 4_000
+                token_limit =
+                  llm_model&.max_prompt_tokens || SiteSetting.ai_hugging_face_token_limit
 
                 payload[:max_tokens] = token_limit - prompt_size(prompt)
               end
@@ -63,11 +64,11 @@ module DiscourseAi
         end
 
         def prepare_request(payload)
+          api_key = llm_model&.api_key || SiteSetting.ai_hugging_face_api_key
+
           headers =
             { "Content-Type" => "application/json" }.tap do |h|
-              if SiteSetting.ai_hugging_face_api_key.present?
-                h["Authorization"] = "Bearer #{SiteSetting.ai_hugging_face_api_key}"
-              end
+              h["Authorization"] = "Bearer #{api_key}" if api_key.present?
             end
 
           Net::HTTP::Post.new(model_uri, headers).tap { |r| r.body = payload }

lib/completions/endpoints/ollama.rb

@@ -48,7 +48,7 @@ module DiscourseAi
         private
 
         def model_uri
-          URI("#{SiteSetting.ai_ollama_endpoint}/v1/chat/completions")
+          URI(llm_model&.url || "#{SiteSetting.ai_ollama_endpoint}/v1/chat/completions")
         end
 
         def prepare_payload(prompt, model_params, _dialect)

lib/completions/endpoints/open_ai.rb

@@ -78,6 +78,8 @@ module DiscourseAi
         private
 
         def model_uri
+          return URI(llm_model.url) if llm_model&.url
+
           url =
             if model.include?("gpt-4")
               if model.include?("32k")
@@ -115,10 +117,12 @@ module DiscourseAi
         def prepare_request(payload)
           headers = { "Content-Type" => "application/json" }
 
+          api_key = llm_model&.api_key || SiteSetting.ai_openai_api_key
+
           if model_uri.host.include?("azure")
-            headers["api-key"] = SiteSetting.ai_openai_api_key
+            headers["api-key"] = api_key
           else
-            headers["Authorization"] = "Bearer #{SiteSetting.ai_openai_api_key}"
+            headers["Authorization"] = "Bearer #{api_key}"
           end
 
           if SiteSetting.ai_openai_organization.present?

lib/completions/endpoints/vllm.rb

@@ -44,6 +44,8 @@ module DiscourseAi
         private
 
         def model_uri
+          return URI(llm_model.url) if llm_model&.url
+
           service = DiscourseAi::Utils::DnsSrv.lookup(SiteSetting.ai_vllm_endpoint_srv)
           if service.present?
             api_endpoint = "https://#{service.target}:#{service.port}/v1/chat/completions"
@@ -63,7 +65,8 @@ module DiscourseAi
         def prepare_request(payload)
           headers = { "Referer" => Discourse.base_url, "Content-Type" => "application/json" }
 
-          headers["X-API-KEY"] = SiteSetting.ai_vllm_api_key if SiteSetting.ai_vllm_api_key.present?
+          api_key = llm_model&.api_key || SiteSetting.ai_vllm_api_key
+          headers["X-API-KEY"] = api_key if api_key.present?
 
           Net::HTTP::Post.new(model_uri, headers).tap { |r| r.body = payload }
         end

lib/completions/llm.rb

@@ -25,7 +25,7 @@ module DiscourseAi
         end
 
         def tokenizer_names
-          DiscourseAi::Completions::Dialects::Dialect.available_tokenizers.map(&:name).uniq
+          DiscourseAi::Tokenizer::BasicTokenizer.available_llm_tokenizers.map(&:name)
         end
 
         def models_by_provider
@@ -91,17 +91,16 @@ module DiscourseAi
         end
 
         def proxy(model_name)
-          # We are in the process of transitioning to always use objects here.
-          # We'll live with this hack for a while.
           provider_and_model_name = model_name.split(":")
           provider_name = provider_and_model_name.first
           model_name_without_prov = provider_and_model_name[1..].join
-          is_custom_model = provider_name == "custom"
 
-          if is_custom_model
+          # We are in the process of transitioning to always use objects here.
+          # We'll live with this hack for a while.
+          if provider_name == "custom"
             llm_model = LlmModel.find(model_name_without_prov)
-            provider_name = llm_model.provider
-            model_name_without_prov = llm_model.name
+            raise UNKNOWN_MODEL if !llm_model
+            return proxy_from_obj(llm_model)
           end
 
           dialect_klass =
@@ -111,24 +110,32 @@ module DiscourseAi
             if @canned_llm && @canned_llm != model_name
               raise "Invalid call LLM call, expected #{@canned_llm} but got #{model_name}"
             end
-            return new(dialect_klass, nil, model_name, opts: { gateway: @canned_response })
-          end
 
-          opts = {}
-          opts[:max_prompt_tokens] = llm_model.max_prompt_tokens if is_custom_model
+            return new(dialect_klass, nil, model_name, gateway: @canned_response)
+          end
 
           gateway_klass = DiscourseAi::Completions::Endpoints::Base.endpoint_for(provider_name)
 
-          new(dialect_klass, gateway_klass, model_name_without_prov, opts: opts)
+          new(dialect_klass, gateway_klass, model_name_without_prov)
+        end
+
+        def proxy_from_obj(llm_model)
+          provider_name = llm_model.provider
+          model_name = llm_model.name
+
+          dialect_klass = DiscourseAi::Completions::Dialects::Dialect.dialect_for(model_name)
+          gateway_klass = DiscourseAi::Completions::Endpoints::Base.endpoint_for(provider_name)
+
+          new(dialect_klass, gateway_klass, model_name, llm_model: llm_model)
         end
       end
 
-      def initialize(dialect_klass, gateway_klass, model_name, opts: {})
+      def initialize(dialect_klass, gateway_klass, model_name, gateway: nil, llm_model: nil)
         @dialect_klass = dialect_klass
         @gateway_klass = gateway_klass
         @model_name = model_name
-        @gateway = opts[:gateway]
-        @max_prompt_tokens = opts[:max_prompt_tokens]
+        @gateway = gateway
+        @llm_model = llm_model
       end
 
       # @param generic_prompt { DiscourseAi::Completions::Prompt } - Our generic prompt object
@@ -185,13 +192,9 @@ module DiscourseAi
 
         model_params.keys.each { |key| model_params.delete(key) if model_params[key].nil? }
 
-        gateway = @gateway || gateway_klass.new(model_name, dialect_klass.tokenizer)
-        dialect =
-          dialect_klass.new(
-            prompt,
-            model_name,
-            opts: model_params.merge(max_prompt_tokens: @max_prompt_tokens),
-          )
+        dialect = dialect_klass.new(prompt, model_name, opts: model_params, llm_model: llm_model)
+
+        gateway = @gateway || gateway_klass.new(model_name, dialect.tokenizer, llm_model: llm_model)
         gateway.perform_completion!(
           dialect,
           user,
@@ -202,18 +205,20 @@ module DiscourseAi
       end
 
       def max_prompt_tokens
-        return @max_prompt_tokens if @max_prompt_tokens.present?
-
-        dialect_klass.new(DiscourseAi::Completions::Prompt.new(""), model_name).max_prompt_tokens
+        llm_model&.max_prompt_tokens ||
+          dialect_klass.new(DiscourseAi::Completions::Prompt.new(""), model_name).max_prompt_tokens
       end
 
-      delegate :tokenizer, to: :dialect_klass
+      def tokenizer
+        llm_model&.tokenizer_class ||
+          dialect_klass.new(DiscourseAi::Completions::Prompt.new(""), model_name).tokenizer
+      end
 
       attr_reader :model_name
 
       private
 
-      attr_reader :dialect_klass, :gateway_klass
+      attr_reader :dialect_klass, :gateway_klass, :llm_model
     end
   end
 end

lib/configuration/llm_validator.rb

@@ -18,19 +18,16 @@ module DiscourseAi
         model_name_without_prov = provider_and_model_name[1..].join
         is_custom_model = provider_name == "custom"
 
-        if is_custom_model
-          llm_model = LlmModel.find(model_name_without_prov)
-          provider_name = llm_model.provider
-          model_name_without_prov = llm_model.name
-        end
+        # Bypass setting validations for custom models. They don't rely on site settings.
+        if !is_custom_model
+          endpoint = DiscourseAi::Completions::Endpoints::Base.endpoint_for(provider_name)
 
-        endpoint = DiscourseAi::Completions::Endpoints::Base.endpoint_for(provider_name)
+          return false if endpoint.nil?
 
-        return false if endpoint.nil?
-
-        if !endpoint.correctly_configured?(model_name_without_prov)
-          @endpoint = endpoint
-          return false
+          if !endpoint.correctly_configured?(model_name_without_prov)
+            @endpoint = endpoint
+            return false
+          end
         end
 
         if !can_talk_to_model?(val)

lib/tokenizer/basic_tokenizer.rb

@@ -4,6 +4,15 @@ module DiscourseAi
   module Tokenizer
     class BasicTokenizer
       class << self
+        def available_llm_tokenizers
+          [
+            DiscourseAi::Tokenizer::AnthropicTokenizer,
+            DiscourseAi::Tokenizer::Llama3Tokenizer,
+            DiscourseAi::Tokenizer::MixtralTokenizer,
+            DiscourseAi::Tokenizer::OpenAiTokenizer,
+          ]
+        end
+
         def tokenizer
           raise NotImplementedError
         end

lib/tokenizer/llama2_tokenizer.rb

@@ -1,12 +0,0 @@
-# frozen_string_literal: true
-
-module DiscourseAi
-  module Tokenizer
-    class Llama2Tokenizer < BasicTokenizer
-      def self.tokenizer
-        @@tokenizer ||=
-          Tokenizers.from_file("./plugins/discourse-ai/tokenizers/llama-2-70b-chat-hf.json")
-      end
-    end
-  end
-end

spec/lib/completions/dialects/dialect_spec.rb

@@ -7,7 +7,7 @@ class TestDialect < DiscourseAi::Completions::Dialects::Dialect
     trim_messages(messages)
   end
 
-  def self.tokenizer
+  def tokenizer
     Class.new do
       def self.size(str)
         str.length

spec/lib/completions/llm_spec.rb

@@ -6,9 +6,7 @@ RSpec.describe DiscourseAi::Completions::Llm do
       DiscourseAi::Completions::Dialects::Mistral,
       canned_response,
       "hugging_face:Upstage-Llama-2-*-instruct-v2",
-      opts: {
-        gateway: canned_response,
-      },
+      gateway: canned_response,
     )
   end
 

spec/shared/tokenizer_spec.rb

@@ -126,23 +126,6 @@ describe DiscourseAi::Tokenizer::AllMpnetBaseV2Tokenizer do
   end
 end
 
-describe DiscourseAi::Tokenizer::Llama2Tokenizer do
-  describe "#size" do
-    describe "returns a token count" do
-      it "for a sentence with punctuation and capitalization and numbers" do
-        expect(described_class.size("Hello, World! 123")).to eq(9)
-      end
-    end
-  end
-
-  describe "#truncate" do
-    it "truncates a sentence" do
-      sentence = "foo bar baz qux quux corge grault garply waldo fred plugh xyzzy thud"
-      expect(described_class.truncate(sentence, 3)).to eq("foo bar")
-    end
-  end
-end
-
 describe DiscourseAi::Tokenizer::MultilingualE5LargeTokenizer do
   describe "#size" do
     describe "returns a token count" do