diff --git a/core/src/main/java/org/elasticsearch/common/io/stream/StreamInput.java b/core/src/main/java/org/elasticsearch/common/io/stream/StreamInput.java
index 3f44b61f212..d00499798b5 100644
--- a/core/src/main/java/org/elasticsearch/common/io/stream/StreamInput.java
+++ b/core/src/main/java/org/elasticsearch/common/io/stream/StreamInput.java
@@ -39,6 +39,7 @@ import org.elasticsearch.index.query.QueryBuilder;
 import org.elasticsearch.index.query.functionscore.ScoreFunctionBuilder;
 import org.elasticsearch.search.rescore.RescoreBuilder;
 import org.elasticsearch.search.suggest.SuggestionBuilder;
+import org.elasticsearch.search.suggest.phrase.PhraseSuggestionBuilder.SmoothingModel;
 import org.joda.time.DateTime;
 import org.joda.time.DateTimeZone;
 
@@ -706,6 +707,13 @@ public abstract class StreamInput extends InputStream {
         return readNamedWriteable(ScoreFunctionBuilder.class);
     }
 
+    /**
+     * Reads a {@link SmoothingModel} from the current stream
+     */
+    public SmoothingModel readSmoothingModel() throws IOException {
+        return readNamedWriteable(SmoothingModel.class);
+    }
+
     /**
      * Reads a list of objects
      */
diff --git a/core/src/main/java/org/elasticsearch/common/io/stream/StreamOutput.java b/core/src/main/java/org/elasticsearch/common/io/stream/StreamOutput.java
index 5e0af597b09..e903ddae1dc 100644
--- a/core/src/main/java/org/elasticsearch/common/io/stream/StreamOutput.java
+++ b/core/src/main/java/org/elasticsearch/common/io/stream/StreamOutput.java
@@ -38,6 +38,7 @@ import org.elasticsearch.index.query.QueryBuilder;
 import org.elasticsearch.index.query.functionscore.ScoreFunctionBuilder;
 import org.elasticsearch.search.rescore.RescoreBuilder;
 import org.elasticsearch.search.suggest.SuggestionBuilder;
+import org.elasticsearch.search.suggest.phrase.PhraseSuggestionBuilder.SmoothingModel;
 import org.joda.time.ReadableInstant;
 
 import java.io.EOFException;
@@ -670,6 +671,13 @@ public abstract class StreamOutput extends OutputStream {
         writeNamedWriteable(scoreFunctionBuilder);
     }
 
+    /**
+     * Writes the given {@link SmoothingModel} to the stream
+     */
+    public void writeSmoothingModel(SmoothingModel smoothinModel) throws IOException {
+        writeNamedWriteable(smoothinModel);
+    }
+
     /**
      * Writes the given {@link GeoPoint} to the stream
      */
diff --git a/core/src/main/java/org/elasticsearch/search/suggest/phrase/PhraseSuggestionBuilder.java b/core/src/main/java/org/elasticsearch/search/suggest/phrase/PhraseSuggestionBuilder.java
index 09d108b6356..a03f9109eda 100644
--- a/core/src/main/java/org/elasticsearch/search/suggest/phrase/PhraseSuggestionBuilder.java
+++ b/core/src/main/java/org/elasticsearch/search/suggest/phrase/PhraseSuggestionBuilder.java
@@ -216,6 +216,13 @@ public final class PhraseSuggestionBuilder extends SuggestionBuilder<PhraseSugge
         return this;
     }
 
+    /**
+     * Gets the {@link SmoothingModel}
+     */
+    public SmoothingModel smoothingModel() {
+        return this.model;
+    }
+
     public PhraseSuggestionBuilder tokenLimit(int tokenLimit) {
         this.tokenLimit = tokenLimit;
         return this;
@@ -391,8 +398,8 @@ public final class PhraseSuggestionBuilder extends SuggestionBuilder<PhraseSugge
          * Default discount parameter for {@link StupidBackoff} smoothing
          */
         public static final double DEFAULT_BACKOFF_DISCOUNT = 0.4;
-        private double discount = DEFAULT_BACKOFF_DISCOUNT;
         static final StupidBackoff PROTOTYPE = new StupidBackoff(DEFAULT_BACKOFF_DISCOUNT);
+        private double discount = DEFAULT_BACKOFF_DISCOUNT;
         private static final String NAME = "stupid_backoff";
         private static final ParseField DISCOUNT_FIELD = new ParseField("discount");
 
@@ -743,7 +750,11 @@ public final class PhraseSuggestionBuilder extends SuggestionBuilder<PhraseSugge
         out.writeOptionalFloat(realWordErrorLikelihood);
         out.writeOptionalFloat(confidence);
         out.writeOptionalVInt(gramSize);
-        // NORELEASE model.writeTo();
+        boolean hasModel = model != null;
+        out.writeBoolean(hasModel);
+        if (hasModel) {
+            out.writeSmoothingModel(model);
+        }
         out.writeOptionalBoolean(forceUnigrams);
         out.writeOptionalVInt(tokenLimit);
         out.writeOptionalString(preTag);
@@ -767,7 +778,9 @@ public final class PhraseSuggestionBuilder extends SuggestionBuilder<PhraseSugge
         builder.realWordErrorLikelihood = in.readOptionalFloat();
         builder.confidence = in.readOptionalFloat();
         builder.gramSize = in.readOptionalVInt();
-        // NORELEASE read model
+        if (in.readBoolean()) {
+            builder.model = in.readSmoothingModel();
+        }
         builder.forceUnigrams = in.readOptionalBoolean();
         builder.tokenLimit = in.readOptionalVInt();
         builder.preTag = in.readOptionalString();
@@ -790,7 +803,7 @@ public final class PhraseSuggestionBuilder extends SuggestionBuilder<PhraseSugge
                 Objects.equals(confidence, other.confidence) &&
                 // NORELEASE Objects.equals(generator, other.generator) &&
                 Objects.equals(gramSize, other.gramSize) &&
-                // NORELEASE Objects.equals(model, other.model) &&
+                Objects.equals(model, other.model) &&
                 Objects.equals(forceUnigrams, other.forceUnigrams) &&
                 Objects.equals(tokenLimit, other.tokenLimit) &&
                 Objects.equals(preTag, other.preTag) &&
@@ -803,10 +816,8 @@ public final class PhraseSuggestionBuilder extends SuggestionBuilder<PhraseSugge
     @Override
     protected int doHashCode() {
         return Objects.hash(maxErrors, separator, realWordErrorLikelihood, confidence,
-                /** NORELEASE generators, */
-                gramSize,
-                /** NORELEASE model, */
-                forceUnigrams, tokenLimit, preTag, postTag,
+                // NORELEASE generators,
+                gramSize, model, forceUnigrams, tokenLimit, preTag, postTag,
                 collateQuery, collateParams, collatePrune);
     }
 
diff --git a/core/src/test/java/org/elasticsearch/search/suggest/AbstractSuggestionBuilderTestCase.java b/core/src/test/java/org/elasticsearch/search/suggest/AbstractSuggestionBuilderTestCase.java
index 71d37a69116..61f678b5a08 100644
--- a/core/src/test/java/org/elasticsearch/search/suggest/AbstractSuggestionBuilderTestCase.java
+++ b/core/src/test/java/org/elasticsearch/search/suggest/AbstractSuggestionBuilderTestCase.java
@@ -38,7 +38,7 @@ import static org.hamcrest.Matchers.not;
 public abstract class AbstractSuggestionBuilderTestCase<SB extends SuggestionBuilder<SB>> extends ESTestCase {
 
     private static final int NUMBER_OF_TESTBUILDERS = 20;
-    private static NamedWriteableRegistry namedWriteableRegistry;
+    protected static NamedWriteableRegistry namedWriteableRegistry;
 
     /**
      * setup for the whole base test class
diff --git a/core/src/test/java/org/elasticsearch/search/suggest/phrase/LaplaceModelTests.java b/core/src/test/java/org/elasticsearch/search/suggest/phrase/LaplaceModelTests.java
index 87ad654e0cd..1a939018b8f 100644
--- a/core/src/test/java/org/elasticsearch/search/suggest/phrase/LaplaceModelTests.java
+++ b/core/src/test/java/org/elasticsearch/search/suggest/phrase/LaplaceModelTests.java
@@ -28,6 +28,11 @@ public class LaplaceModelTests extends SmoothingModelTestCase {
 
     @Override
     protected SmoothingModel createTestModel() {
+        return createRandomModel();
+    }
+
+
+    static SmoothingModel createRandomModel() {
         return new Laplace(randomDoubleBetween(0.0, 10.0, false));
     }
 
diff --git a/core/src/test/java/org/elasticsearch/search/suggest/phrase/LinearInterpolationModelTests.java b/core/src/test/java/org/elasticsearch/search/suggest/phrase/LinearInterpolationModelTests.java
index 1112b7a5ed7..7984395abcc 100644
--- a/core/src/test/java/org/elasticsearch/search/suggest/phrase/LinearInterpolationModelTests.java
+++ b/core/src/test/java/org/elasticsearch/search/suggest/phrase/LinearInterpolationModelTests.java
@@ -28,6 +28,10 @@ public class LinearInterpolationModelTests extends SmoothingModelTestCase {
 
     @Override
     protected SmoothingModel createTestModel() {
+        return createRandomModel();
+    }
+
+    static LinearInterpolation createRandomModel() {
         double trigramLambda = randomDoubleBetween(0.0, 10.0, false);
         double bigramLambda = randomDoubleBetween(0.0, 10.0, false);
         double unigramLambda = randomDoubleBetween(0.0, 10.0, false);
diff --git a/core/src/test/java/org/elasticsearch/search/suggest/phrase/PhraseSuggestionBuilderTests.java b/core/src/test/java/org/elasticsearch/search/suggest/phrase/PhraseSuggestionBuilderTests.java
index 74f655b6aa1..63fb937f3d0 100644
--- a/core/src/test/java/org/elasticsearch/search/suggest/phrase/PhraseSuggestionBuilderTests.java
+++ b/core/src/test/java/org/elasticsearch/search/suggest/phrase/PhraseSuggestionBuilderTests.java
@@ -21,6 +21,11 @@ package org.elasticsearch.search.suggest.phrase;
 
 import org.elasticsearch.script.Template;
 import org.elasticsearch.search.suggest.AbstractSuggestionBuilderTestCase;
+import org.elasticsearch.search.suggest.phrase.PhraseSuggestionBuilder.Laplace;
+import org.elasticsearch.search.suggest.phrase.PhraseSuggestionBuilder.LinearInterpolation;
+import org.elasticsearch.search.suggest.phrase.PhraseSuggestionBuilder.SmoothingModel;
+import org.elasticsearch.search.suggest.phrase.PhraseSuggestionBuilder.StupidBackoff;
+import org.junit.BeforeClass;
 
 import java.io.IOException;
 import java.util.HashMap;
@@ -28,6 +33,13 @@ import java.util.Map;
 
 public class PhraseSuggestionBuilderTests extends AbstractSuggestionBuilderTestCase<PhraseSuggestionBuilder> {
 
+    @BeforeClass
+    public static void initSmoothingModels() {
+        namedWriteableRegistry.registerPrototype(SmoothingModel.class, Laplace.PROTOTYPE);
+        namedWriteableRegistry.registerPrototype(SmoothingModel.class, LinearInterpolation.PROTOTYPE);
+        namedWriteableRegistry.registerPrototype(SmoothingModel.class, StupidBackoff.PROTOTYPE);
+    }
+
     @Override
     protected PhraseSuggestionBuilder randomSuggestionBuilder() {
         PhraseSuggestionBuilder testBuilder = new PhraseSuggestionBuilder(randomAsciiOfLength(10));
@@ -50,7 +62,7 @@ public class PhraseSuggestionBuilderTests extends AbstractSuggestionBuilderTestC
             testBuilder.collateParams(collateParams );
         }
         if (randomBoolean()) {
-            // NORELEASE add random model
+            randomSmoothingModel();
         }
 
         if (randomBoolean()) {
@@ -59,6 +71,22 @@ public class PhraseSuggestionBuilderTests extends AbstractSuggestionBuilderTestC
         return testBuilder;
     }
 
+    private static SmoothingModel randomSmoothingModel() {
+        SmoothingModel model = null;
+        switch (randomIntBetween(0,2)) {
+        case 0:
+            model = LaplaceModelTests.createRandomModel();
+            break;
+        case 1:
+            model = StupidBackoffModelTests.createRandomModel();
+            break;
+        case 2:
+            model = LinearInterpolationModelTests.createRandomModel();
+            break;
+        }
+        return model;
+    }
+
     @Override
     protected void mutateSpecificParameters(PhraseSuggestionBuilder builder) throws IOException {
         switch (randomIntBetween(0, 7)) {
@@ -107,6 +135,9 @@ public class PhraseSuggestionBuilderTests extends AbstractSuggestionBuilderTestC
         case 10:
             builder.collateParams().put(randomAsciiOfLength(5), randomAsciiOfLength(5));
             break;
+        case 11:
+            builder.smoothingModel(randomValueOtherThan(builder.smoothingModel(), PhraseSuggestionBuilderTests::randomSmoothingModel));
+            break;
         // TODO mutate random Model && generator
         }
     }
diff --git a/core/src/test/java/org/elasticsearch/search/suggest/phrase/StupidBackoffModelTests.java b/core/src/test/java/org/elasticsearch/search/suggest/phrase/StupidBackoffModelTests.java
index c3bd66d2a81..3a59c19b13e 100644
--- a/core/src/test/java/org/elasticsearch/search/suggest/phrase/StupidBackoffModelTests.java
+++ b/core/src/test/java/org/elasticsearch/search/suggest/phrase/StupidBackoffModelTests.java
@@ -28,6 +28,10 @@ public class StupidBackoffModelTests extends SmoothingModelTestCase {
 
     @Override
     protected SmoothingModel createTestModel() {
+        return createRandomModel();
+    }
+
+    static SmoothingModel createRandomModel() {
         return new StupidBackoff(randomDoubleBetween(0.0, 10.0, false));
     }