diff --git a/native/jni/com_android_inputmethod_latin_BinaryDictionary.cpp b/native/jni/com_android_inputmethod_latin_BinaryDictionary.cpp
index 6e2219d87..c2cd2addd 100644
--- a/native/jni/com_android_inputmethod_latin_BinaryDictionary.cpp
+++ b/native/jni/com_android_inputmethod_latin_BinaryDictionary.cpp
@@ -304,17 +304,18 @@ static jint latinime_BinaryDictionary_getNextWord(JNIEnv *env, jclass clazz,
         jlong dict, jint token, jintArray outCodePoints) {
     Dictionary *dictionary = reinterpret_cast<Dictionary *>(dict);
     if (!dictionary) return 0;
-    const jsize outCodePointsLength = env->GetArrayLength(outCodePoints);
-    if (outCodePointsLength != MAX_WORD_LENGTH) {
-        AKLOGE("Invalid outCodePointsLength: %d", outCodePointsLength);
+    const jsize codePointBufSize = env->GetArrayLength(outCodePoints);
+    if (codePointBufSize != MAX_WORD_LENGTH) {
+        AKLOGE("Invalid outCodePointsLength: %d", codePointBufSize);
         ASSERT(false);
         return 0;
     }
-    int wordCodePoints[outCodePointsLength];
-    memset(wordCodePoints, 0, sizeof(wordCodePoints));
-    const int nextToken = dictionary->getNextWordAndNextToken(token, wordCodePoints);
+    int wordCodePoints[codePointBufSize];
+    int wordCodePointCount = 0;
+    const int nextToken = dictionary->getNextWordAndNextToken(token, wordCodePoints,
+            &wordCodePointCount);
     JniDataUtils::outputCodePoints(env, outCodePoints, 0 /* start */,
-            MAX_WORD_LENGTH /* maxLength */, wordCodePoints, outCodePointsLength,
+            MAX_WORD_LENGTH /* maxLength */, wordCodePoints, wordCodePointCount,
             false /* needsNullTermination */);
     return nextToken;
 }
@@ -555,12 +556,13 @@ static bool latinime_BinaryDictionary_migrateNative(JNIEnv *env, jclass clazz, j
 
     // TODO: Migrate historical information.
     int wordCodePoints[MAX_WORD_LENGTH];
+    int wordCodePointCount = 0;
     int token = 0;
     // Add unigrams.
     do {
-        token = dictionary->getNextWordAndNextToken(token, wordCodePoints);
-        const int wordLength = CharUtils::getCodePointCount(MAX_WORD_LENGTH, wordCodePoints);
-        const WordProperty wordProperty = dictionary->getWordProperty(wordCodePoints, wordLength);
+        token = dictionary->getNextWordAndNextToken(token, wordCodePoints, &wordCodePointCount);
+        const WordProperty wordProperty = dictionary->getWordProperty(wordCodePoints,
+                wordCodePointCount);
         if (dictionaryStructureWithBufferPolicy->needsToRunGC(true /* mindsBlockByGC */)) {
             dictionaryStructureWithBufferPolicy = runGCAndGetNewStructurePolicy(
                     std::move(dictionaryStructureWithBufferPolicy), dictFilePathChars);
@@ -569,8 +571,8 @@ static bool latinime_BinaryDictionary_migrateNative(JNIEnv *env, jclass clazz, j
                 return false;
             }
         }
-        if (!dictionaryStructureWithBufferPolicy->addUnigramEntry(wordCodePoints, wordLength,
-                wordProperty.getUnigramProperty())) {
+        if (!dictionaryStructureWithBufferPolicy->addUnigramEntry(wordCodePoints,
+                wordCodePointCount, wordProperty.getUnigramProperty())) {
             LogUtils::logToJava(env, "Cannot add unigram to the new dict.");
             return false;
         }
@@ -578,9 +580,9 @@ static bool latinime_BinaryDictionary_migrateNative(JNIEnv *env, jclass clazz, j
 
     // Add bigrams.
     do {
-        token = dictionary->getNextWordAndNextToken(token, wordCodePoints);
-        const int wordLength = CharUtils::getCodePointCount(MAX_WORD_LENGTH, wordCodePoints);
-        const WordProperty wordProperty = dictionary->getWordProperty(wordCodePoints, wordLength);
+        token = dictionary->getNextWordAndNextToken(token, wordCodePoints, &wordCodePointCount);
+        const WordProperty wordProperty = dictionary->getWordProperty(wordCodePoints,
+                wordCodePointCount);
         if (dictionaryStructureWithBufferPolicy->needsToRunGC(true /* mindsBlockByGC */)) {
             dictionaryStructureWithBufferPolicy = runGCAndGetNewStructurePolicy(
                     std::move(dictionaryStructureWithBufferPolicy), dictFilePathChars);
@@ -589,8 +591,8 @@ static bool latinime_BinaryDictionary_migrateNative(JNIEnv *env, jclass clazz, j
                 return false;
             }
         }
-        const PrevWordsInfo prevWordsInfo(wordCodePoints, wordLength,
-                false /* isStartOfSentence */);
+        const PrevWordsInfo prevWordsInfo(wordCodePoints, wordCodePointCount,
+                false /* isBeginningOfSentence */);
         for (const BigramProperty &bigramProperty : *wordProperty.getBigramProperties()) {
             if (!dictionaryStructureWithBufferPolicy->addNgramEntry(&prevWordsInfo,
                     &bigramProperty)) {
diff --git a/native/jni/src/suggest/core/dictionary/dictionary.cpp b/native/jni/src/suggest/core/dictionary/dictionary.cpp
index 0bcde2294..228260216 100644
--- a/native/jni/src/suggest/core/dictionary/dictionary.cpp
+++ b/native/jni/src/suggest/core/dictionary/dictionary.cpp
@@ -145,10 +145,11 @@ const WordProperty Dictionary::getWordProperty(const int *const codePoints,
             codePoints, codePointCount);
 }
 
-int Dictionary::getNextWordAndNextToken(const int token, int *const outCodePoints) {
+int Dictionary::getNextWordAndNextToken(const int token, int *const outCodePoints,
+        int *const outCodePointCount) {
     TimeKeeper::setCurrentTime();
     return mDictionaryStructureWithBufferPolicy->getNextWordAndNextToken(
-            token, outCodePoints);
+            token, outCodePoints, outCodePointCount);
 }
 
 void Dictionary::logDictionaryInfo(JNIEnv *const env) const {
diff --git a/native/jni/src/suggest/core/dictionary/dictionary.h b/native/jni/src/suggest/core/dictionary/dictionary.h
index 542ba7291..247ee2421 100644
--- a/native/jni/src/suggest/core/dictionary/dictionary.h
+++ b/native/jni/src/suggest/core/dictionary/dictionary.h
@@ -103,7 +103,8 @@ class Dictionary {
     // Method to iterate all words in the dictionary.
     // The returned token has to be used to get the next word. If token is 0, this method newly
     // starts iterating the dictionary.
-    int getNextWordAndNextToken(const int token, int *const outCodePoints);
+    int getNextWordAndNextToken(const int token, int *const outCodePoints,
+            int *const outCodePointCount);
 
     const DictionaryStructureWithBufferPolicy *getDictionaryStructurePolicy() const {
         return mDictionaryStructureWithBufferPolicy.get();
diff --git a/native/jni/src/suggest/core/policy/dictionary_structure_with_buffer_policy.h b/native/jni/src/suggest/core/policy/dictionary_structure_with_buffer_policy.h
index e2771f97c..b72601109 100644
--- a/native/jni/src/suggest/core/policy/dictionary_structure_with_buffer_policy.h
+++ b/native/jni/src/suggest/core/policy/dictionary_structure_with_buffer_policy.h
@@ -104,7 +104,8 @@ class DictionaryStructureWithBufferPolicy {
     // Method to iterate all words in the dictionary.
     // The returned token has to be used to get the next word. If token is 0, this method newly
     // starts iterating the dictionary.
-    virtual int getNextWordAndNextToken(const int token, int *const outCodePoints) = 0;
+    virtual int getNextWordAndNextToken(const int token, int *const outCodePoints,
+            int *const outCodePointCount) = 0;
 
     virtual bool isCorrupted() const = 0;
 
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/backward/v402/ver4_patricia_trie_policy.cpp b/native/jni/src/suggest/policyimpl/dictionary/structure/backward/v402/ver4_patricia_trie_policy.cpp
index 4ac0f406e..9780ae048 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/backward/v402/ver4_patricia_trie_policy.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/backward/v402/ver4_patricia_trie_policy.cpp
@@ -478,10 +478,9 @@ const WordProperty Ver4PatriciaTriePolicy::getWordProperty(const int *const code
     return WordProperty(&codePointVector, &unigramProperty, &bigrams);
 }
 
-int Ver4PatriciaTriePolicy::getNextWordAndNextToken(const int token, int *const outCodePoints) {
-    // TODO: Return code point count like other methods.
-    // Null termination.
-    outCodePoints[0] = 0;
+int Ver4PatriciaTriePolicy::getNextWordAndNextToken(const int token, int *const outCodePoints,
+        int *const outCodePointCount) {
+    *outCodePointCount = 0;
     if (token == 0) {
         mTerminalPtNodePositionsForIteratingWords.clear();
         DynamicPtReadingHelper::TraversePolicyToGetAllTerminalPtNodePositions traversePolicy(
@@ -498,13 +497,8 @@ int Ver4PatriciaTriePolicy::getNextWordAndNextToken(const int token, int *const
     }
     const int terminalPtNodePos = mTerminalPtNodePositionsForIteratingWords[token];
     int unigramProbability = NOT_A_PROBABILITY;
-    const int codePointCount = getCodePointsAndProbabilityAndReturnCodePointCount(
+    *outCodePointCount = getCodePointsAndProbabilityAndReturnCodePointCount(
             terminalPtNodePos, MAX_WORD_LENGTH, outCodePoints, &unigramProbability);
-    if (codePointCount < MAX_WORD_LENGTH) {
-        // Null termination. outCodePoints have to be null terminated or contain MAX_WORD_LENGTH
-        // code points.
-        outCodePoints[codePointCount] = 0;
-    }
     const int nextToken = token + 1;
     if (nextToken >= terminalPtNodePositionsVectorSize) {
         // All words have been iterated.
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/backward/v402/ver4_patricia_trie_policy.h b/native/jni/src/suggest/policyimpl/dictionary/structure/backward/v402/ver4_patricia_trie_policy.h
index 2e948ac4a..16b1bd2c1 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/backward/v402/ver4_patricia_trie_policy.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/backward/v402/ver4_patricia_trie_policy.h
@@ -134,7 +134,8 @@ class Ver4PatriciaTriePolicy : public DictionaryStructureWithBufferPolicy {
     const WordProperty getWordProperty(const int *const codePoints,
             const int codePointCount) const;
 
-    int getNextWordAndNextToken(const int token, int *const outCodePoints);
+    int getNextWordAndNextToken(const int token, int *const outCodePoints,
+            int *const outCodePointCount);
 
     bool isCorrupted() const {
         return mIsCorrupted;
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v2/patricia_trie_policy.cpp b/native/jni/src/suggest/policyimpl/dictionary/structure/v2/patricia_trie_policy.cpp
index 7e1f3b233..5c62b9caf 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/v2/patricia_trie_policy.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v2/patricia_trie_policy.cpp
@@ -391,7 +391,9 @@ const WordProperty PatriciaTriePolicy::getWordProperty(const int *const codePoin
     return WordProperty(&codePointVector, &unigramProperty, &bigrams);
 }
 
-int PatriciaTriePolicy::getNextWordAndNextToken(const int token, int *const outCodePoints) {
+int PatriciaTriePolicy::getNextWordAndNextToken(const int token, int *const outCodePoints,
+        int *const outCodePointCount) {
+    *outCodePointCount = 0;
     if (token == 0) {
         // Start iterating the dictionary.
         mTerminalPtNodePositionsForIteratingWords.clear();
@@ -409,8 +411,8 @@ int PatriciaTriePolicy::getNextWordAndNextToken(const int token, int *const outC
     }
     const int terminalPtNodePos = mTerminalPtNodePositionsForIteratingWords[token];
     int unigramProbability = NOT_A_PROBABILITY;
-    getCodePointsAndProbabilityAndReturnCodePointCount(terminalPtNodePos, MAX_WORD_LENGTH,
-            outCodePoints, &unigramProbability);
+    *outCodePointCount = getCodePointsAndProbabilityAndReturnCodePointCount(terminalPtNodePos,
+            MAX_WORD_LENGTH, outCodePoints, &unigramProbability);
     const int nextToken = token + 1;
     if (nextToken >= terminalPtNodePositionsVectorSize) {
         // All words have been iterated.
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v2/patricia_trie_policy.h b/native/jni/src/suggest/policyimpl/dictionary/structure/v2/patricia_trie_policy.h
index dce94363a..ec8407408 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/v2/patricia_trie_policy.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v2/patricia_trie_policy.h
@@ -137,7 +137,8 @@ class PatriciaTriePolicy : public DictionaryStructureWithBufferPolicy {
     const WordProperty getWordProperty(const int *const codePoints,
             const int codePointCount) const;
 
-    int getNextWordAndNextToken(const int token, int *const outCodePoints);
+    int getNextWordAndNextToken(const int token, int *const outCodePoints,
+            int *const outCodePointCount);
 
     bool isCorrupted() const {
         return mIsCorrupted;
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_policy.cpp b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_policy.cpp
index f7f2a32b4..46107d92a 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_policy.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_policy.cpp
@@ -489,10 +489,9 @@ const WordProperty Ver4PatriciaTriePolicy::getWordProperty(const int *const code
     return WordProperty(&codePointVector, &unigramProperty, &bigrams);
 }
 
-int Ver4PatriciaTriePolicy::getNextWordAndNextToken(const int token, int *const outCodePoints) {
-    // TODO: Return code point count like other methods.
-    // Null termination.
-    outCodePoints[0] = 0;
+int Ver4PatriciaTriePolicy::getNextWordAndNextToken(const int token, int *const outCodePoints,
+        int *const outCodePointCount) {
+    *outCodePointCount = 0;
     if (token == 0) {
         mTerminalPtNodePositionsForIteratingWords.clear();
         DynamicPtReadingHelper::TraversePolicyToGetAllTerminalPtNodePositions traversePolicy(
@@ -509,13 +508,8 @@ int Ver4PatriciaTriePolicy::getNextWordAndNextToken(const int token, int *const
     }
     const int terminalPtNodePos = mTerminalPtNodePositionsForIteratingWords[token];
     int unigramProbability = NOT_A_PROBABILITY;
-    const int codePointCount = getCodePointsAndProbabilityAndReturnCodePointCount(
+    *outCodePointCount = getCodePointsAndProbabilityAndReturnCodePointCount(
             terminalPtNodePos, MAX_WORD_LENGTH, outCodePoints, &unigramProbability);
-    if (codePointCount < MAX_WORD_LENGTH) {
-        // Null termination. outCodePoints have to be null terminated or contain MAX_WORD_LENGTH
-        // code points.
-        outCodePoints[codePointCount] = 0;
-    }
     const int nextToken = token + 1;
     if (nextToken >= terminalPtNodePositionsVectorSize) {
         // All words have been iterated.
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_policy.h b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_policy.h
index 0a20965f3..5d66a2cce 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_policy.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_policy.h
@@ -113,7 +113,8 @@ class Ver4PatriciaTriePolicy : public DictionaryStructureWithBufferPolicy {
     const WordProperty getWordProperty(const int *const codePoints,
             const int codePointCount) const;
 
-    int getNextWordAndNextToken(const int token, int *const outCodePoints);
+    int getNextWordAndNextToken(const int token, int *const outCodePoints,
+            int *const outCodePointCount);
 
     bool isCorrupted() const {
         return mIsCorrupted;