Baseten announces OpenAI partnership for enterprise open-model access

Baseten announced a partnership with OpenAI on Sept. 29, bringing its open-model inference into the OpenAI B2B Marketplace with a native Codex integration.

The company says OpenAI enterprise customers can use existing OpenAI commitments for models served by Baseten, either in Codex or through the Responses API. Baseten describes this as a way to combine open and closed models and route coding tasks to the model that fits the job.

Nathan Lambert’s reaction was that OpenAI’s perceived pressure to serve these models was a favorable signal for open models. That is his interpretation of the partnership, rather than an explanation from OpenAI of its motives.

The announcement addresses enterprise customers and directs those seeking native Codex access through their OpenAI commitment to an interest list.