OpenAI launches marketplace: Baseten open-weight inference sold via Responses API

baseten · x · 2026-09-30

Baseten's CEO called OpenAI's marketplace the biggest announcement of the day: customers can now buy open-weight model inference from Baseten directly through OpenAI's Responses API (and Codex).

This brings third-party inference providers into OpenAI's API distribution channel, letting developers call open-weight models without changing endpoints — and marks OpenAI's entry into model hosting reselling.

Related event: Baseten Becomes First Open-Model Inference Provider in OpenAI's B2B Marketplace(4 posts)→

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