changelog and model docs

Author: mchenco

src/content/changelog/workers-ai/2025-08-05-openai-open-models.mdx

@@ -0,0 +1,42 @@
+---
+title: OpenAI open models now available on Workers AI
+description: Partnering with OpenAI as a Day 0 launch partner to bring you 2 new open models on Workers AI
+products:
+  - agents
+  - workers-ai
+date: 2025-08-05
+---
+
+We're thrilled to be a Day 0 partner with [OpenAI](http://openai.com/index/introducing-gpt-oss) to bring their [latest open models](https://openai.com/index/gpt-oss-model-card/) to Workers AI, including support for Responses API, Code Interpreter, and Web Search (coming soon).
+
+Get started with the new models at `@cf/openai/gpt-oss-120b` and `@cf/openai/gpt-oss-20b`.
+Check out the [blog](https://blog.cloudflare.com/openai-gpt-oss-on-workers-ai) for more details about the new models, and the [`gpt-oss-120b`](/workers-ai/models/gpt-oss-120b) and [`gpt-oss-20b`](/workers-ai/models/gpt-oss-20b) model pages for more information about pricing and context windows.
+
+## Responses API
+The new Responses API is available through the REST API at `https://api.cloudflare.com/client/v4/accounts/<account_id>/ai/run/@cf/openai/gpt-oss-120b/responses`. Responses API streaming support is coming soon.
+
+The existing Workers Binding `env.AI.run(“@cf/openai/gpt-oss-120b”)` and REST API `https://api.cloudflare.com/client/v4/accounts/<account_id>/ai/run/@cf/openai/gpt-oss-120b` and OpenAI compatible REST API endpoint `https://api.cloudflare.com/client/v4/accounts/<account_id>/ai/run/@cf/openai/gpt-oss-120b/chat/completions` will return the Chat Completions format for backwards compatibility.
+
+```
+curl https://api.cloudflare.com/client/v4/accounts/<account_id>/ai/v1/responses \
+  -H "Content-Type: application/json" \
+  -H "Authorization: Bearer $CLOUDFLARE_API_KEY" \
+  -d '{
+    "model": "@cf/openai/gpt-oss-120b",
+    "reasoning": {"effort": "medium"},
+    "input": [
+      {
+        "role": "user",
+        "content": "What are the benefits of open-source models?"
+      }
+    ]
+  }'
+
+
+```
+
+## Code Interpreter
+The model is natively trained to support stateful code execution, and we've implemented support for this feature using our [Sandbox SDK](https://github.com/cloudflare/sandbox-sdk) and [Containers](https://blog.cloudflare.com/containers-are-available-in-public-beta-for-simple-global-and-programmable/). Cloudflare's Developer Platform is uniquely positioned to support this feature, so we're very excited to bring our products together to support this new use case.
+
+## Web Search (coming soon)
+We are working to implement Web Search for the model, where users can bring their own Exa API Key so the model can browse the Internet.