diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 2e339e660..1dfdd77f3 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "4.50.0"
+  ".": "4.51.0"
 }
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1ee8c73f1..86f6e8123 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,28 @@
 # Changelog
 
+## [4.51.0](https://github.com/openai/openai-java/compare/v4.50.0...v4.51.0) (2026-08-11)
+
+
+### Features
+
+* **api:** Add GPT_DAYBREAK and GPT_5_6_CYBER model identifiers ([5b9ba3a](https://github.com/openai/openai-java/commit/5b9ba3a75cbbb77335408c92f02be6f7b8c406ac))
+
+
+### Bug Fixes
+
+* **api:** Add GPT_DAYBREAK and GPT_5_6_CYBER model identifiers ([#856](https://github.com/openai/openai-java/issues/856)) ([5b9ba3a](https://github.com/openai/openai-java/commit/5b9ba3a75cbbb77335408c92f02be6f7b8c406ac))
+* **api:** clarify audio upload metadata requirements ([#857](https://github.com/openai/openai-java/issues/857)) ([593f04c](https://github.com/openai/openai-java/commit/593f04c912d9331cd83c71ba7a4f6846e2e02fcc))
+
+
+### Chores
+
+* **api:** Update generated file header text ([#846](https://github.com/openai/openai-java/issues/846)) ([d11a357](https://github.com/openai/openai-java/commit/d11a357aea469a78400334beadeeac17ca24fd69))
+
+
+### Documentation
+
+* keep README badges on latest release ([#839](https://github.com/openai/openai-java/issues/839)) ([33c6b57](https://github.com/openai/openai-java/commit/33c6b57709af067148dea6026c0d160df3413635))
+
 ## [4.50.0](https://github.com/openai/openai-java/compare/v4.49.0...v4.50.0) (2026-08-03)
 
 
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index c0828069f..4433d1850 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -76,14 +76,14 @@ Then in your project's `build.gradle.kts` or `pom.xml`, reference the locally pu
 <!-- x-release-please-start-version -->
 
 ```kotlin
-implementation("com.openai:openai-java:4.50.0")
+implementation("com.openai:openai-java:4.51.0")
 ```
 
 ```xml
 <dependency>
   <groupId>com.openai</groupId>
   <artifactId>openai-java</artifactId>
-  <version>4.50.0</version>
+  <version>4.51.0</version>
 </dependency>
 ```
 
diff --git a/README.md b/README.md
index 99c129546..b81984d27 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,7 @@ The REST API documentation can be found on [platform.openai.com](https://platfor
 ### Gradle
 
 ```kotlin
-implementation("com.openai:openai-java:4.50.0")
+implementation("com.openai:openai-java:4.51.0")
 ```
 
 ### Maven
@@ -24,7 +24,7 @@ implementation("com.openai:openai-java:4.50.0")
 <dependency>
   <groupId>com.openai</groupId>
   <artifactId>openai-java</artifactId>
-  <version>4.50.0</version>
+  <version>4.51.0</version>
 </dependency>
 ```
 
@@ -87,7 +87,7 @@ with normal AWS credentials:
 <!-- x-release-please-start-version -->
 
 ```kotlin
-implementation("com.openai:openai-java-bedrock:4.50.0")
+implementation("com.openai:openai-java-bedrock:4.51.0")
 ```
 
 <!-- x-release-please-end -->
diff --git a/bedrock.md b/bedrock.md
index 803f99e46..db928aa82 100644
--- a/bedrock.md
+++ b/bedrock.md
@@ -11,14 +11,14 @@ Use this artifact instead of adding AWS dependencies to the base OpenAI package
 <!-- x-release-please-start-version -->
 
 ```kotlin
-implementation("com.openai:openai-java-bedrock:4.50.0")
+implementation("com.openai:openai-java-bedrock:4.51.0")
 ```
 
 ```xml
 <dependency>
   <groupId>com.openai</groupId>
   <artifactId>openai-java-bedrock</artifactId>
-  <version>4.50.0</version>
+  <version>4.51.0</version>
 </dependency>
 ```
 
diff --git a/build.gradle.kts b/build.gradle.kts
index aea3e0d3c..9c590b26d 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -30,7 +30,7 @@ repositories {
 
 allprojects {
     group = "com.openai"
-    version = "4.50.0" // x-release-please-version
+    version = "4.51.0" // x-release-please-version
 
     // Dokka 2.1.0 depends on Jackson 2.15.3. Keep its isolated build-tool classpaths on a
     // secure, internally aligned Jackson release without changing the SDK's published or