Enterprise teams can now use open models like GLM-5.3 Flash and Kimi K3 natively in Codex and count spend against their OpenAI commit.
Baseten
@baseten
Sep 29
Article

Announcing our partnership with OpenAI

We’re excited to partner with OpenAI as one of the first open-model inference providers in the OpenAI B2B Marketplace, including a native integration within Codex. OpenAI enterprise customers can now

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Replying to @philipkiely
Wow, never expected frontier labs to add opensource models to their products. What about support in Agents API?

Sep 29, 2026 · 6:44 PM UTC

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Replying to @sshchoholiev
Supports Responses API and Codex today
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