diff --git a/model/src/main/java/com/basistech/rosette/apimodel/CategoriesOptions.java b/model/src/main/java/com/basistech/rosette/apimodel/CategoriesOptions.java
index 29ba8c781..9b5a81961 100644
--- a/model/src/main/java/com/basistech/rosette/apimodel/CategoriesOptions.java
+++ b/model/src/main/java/com/basistech/rosette/apimodel/CategoriesOptions.java
@@ -25,6 +25,14 @@ public final class CategoriesOptions {
     private Boolean explain;
     private Integer numCategories;
 
+    /**
+     * Create a set of categorization options with default values.
+     * Note that {@code null} is used to represent defaults.
+     */
+    public CategoriesOptions() {
+        //
+    }
+
     /**
      * constructor for {@code CategoriesOptions}
      * @param model model to use for categorization
diff --git a/model/src/main/java/com/basistech/rosette/apimodel/EntitiesOptions.java b/model/src/main/java/com/basistech/rosette/apimodel/EntitiesOptions.java
index 1422eded9..ff11a3ff5 100644
--- a/model/src/main/java/com/basistech/rosette/apimodel/EntitiesOptions.java
+++ b/model/src/main/java/com/basistech/rosette/apimodel/EntitiesOptions.java
@@ -31,6 +31,14 @@ public final class EntitiesOptions {
     private Boolean allowPartialGazetteerMatches;
     private Boolean redactorPreferLength;
 
+    /**
+     * Create a set of entity extraction options with default values.
+     * Note that {@code null} is used to represent defaults.
+     */
+    public EntitiesOptions() {
+        //
+    }
+
     /**
      * Constructor for {@code EntitiesOptions}
      * @param resolveNamedEntities resolve in-document named entities
diff --git a/model/src/main/java/com/basistech/rosette/apimodel/LanguageOptions.java b/model/src/main/java/com/basistech/rosette/apimodel/LanguageOptions.java
index 5b22be63c..03d9d43b0 100644
--- a/model/src/main/java/com/basistech/rosette/apimodel/LanguageOptions.java
+++ b/model/src/main/java/com/basistech/rosette/apimodel/LanguageOptions.java
@@ -34,6 +34,13 @@ public final class LanguageOptions {
     private String encodingHint;
     private Double encodingHintWeight;
     private Set<LanguageWeight> languageWeightAdjustments;
+
+    /**
+     * Create a set of language detection options with default values.
+     * Note that {@code null} is used to represent defaults.
+     */
+    public LanguageOptions() {
+    }
     
     /**
      * constructor for {@code LanguageOptions} 
diff --git a/model/src/main/java/com/basistech/rosette/apimodel/MorphologyOptions.java b/model/src/main/java/com/basistech/rosette/apimodel/MorphologyOptions.java
index fa05e8847..dc85c525a 100644
--- a/model/src/main/java/com/basistech/rosette/apimodel/MorphologyOptions.java
+++ b/model/src/main/java/com/basistech/rosette/apimodel/MorphologyOptions.java
@@ -30,6 +30,14 @@ public final class MorphologyOptions {
     private Boolean fstTokenize;
     private String defaultTokenizationLanguage;
 
+    /**
+     * Create a set of morphology options with default values.
+     * Note that {@code null} is used to represent defaults.
+     */
+    public MorphologyOptions() {
+        //
+    }
+
     /**
      * constructor for {@code MorphologyOptions}
      * @param disambiguate whether the linguistics analysis should disambiguate results
diff --git a/model/src/main/java/com/basistech/rosette/apimodel/RelationshipOptions.java b/model/src/main/java/com/basistech/rosette/apimodel/RelationshipOptions.java
index e7e2576e6..060378c0f 100644
--- a/model/src/main/java/com/basistech/rosette/apimodel/RelationshipOptions.java
+++ b/model/src/main/java/com/basistech/rosette/apimodel/RelationshipOptions.java
@@ -23,6 +23,14 @@ public final class RelationshipOptions {
 
     private AccuracyMode accuracyMode;
 
+    /**
+     * Create a set of relationship extraction options with default values.
+     * Note that {@code null} is used to represent defaults.
+     */
+    public RelationshipOptions() {
+        //
+    }
+
     /**
      * constructor for {@code RelationshipOptions}
      * @param accuracyMode   accuracyMode to use for relationship extraction
diff --git a/model/src/main/java/com/basistech/rosette/apimodel/SentimentOptions.java b/model/src/main/java/com/basistech/rosette/apimodel/SentimentOptions.java
index 8dfa8b3f6..940d8a9dd 100644
--- a/model/src/main/java/com/basistech/rosette/apimodel/SentimentOptions.java
+++ b/model/src/main/java/com/basistech/rosette/apimodel/SentimentOptions.java
@@ -24,6 +24,14 @@ public final class SentimentOptions {
     private SentimentModel model;
     private Boolean explain;
 
+    /**
+     * Create a set of sentiment analysis options with default values.
+     * Note that {@code null} is used to represent defaults.
+     */
+    public SentimentOptions() {
+        //
+    }
+
     /**
      * constructor for {@code SentimentOptions}
      * @param model   model to use for sentiment analysis