Openai’s flagship coding tool just started reselling a chinese open model. baseten now lets…
openai’s flagship coding tool just started reselling a chinese open model. baseten now lets enterprise users run kimi k3 — moonshot’s 2.8t-parameter open weights — inside codex, with usage billed straight into existing openai commitments, the first deal of its kind for a chinese model.
the walled garden is now a marketplace for its rivals.
Context
Verified date: Baseten announced its OpenAI partnership on Sep 29, 2026, as one of the first open-model inference providers in the OpenAI B2B Marketplace, with a native Codex integration. TechNode (Sep 30) says enterprise customers can count Kimi K3 use against existing OpenAI spending commitments, and that Sina Finance called it the first time a Chinese open model entered OpenAI's enterprise billing system.
Inside AI (Sep 30) and AI Daily Insights (Oct 1) report the same arrangement.
The Baseten route into Codex, the billing against OpenAI commitments and the 'first of its kind' framing match TechNode, which attributes the 'first' to Sina Finance. The date in the post is Oct 1 and the announcement is Sep 29. Kimi K3 having 2.8 trillion parameters was not seen in the sources read, so unsupported here, not refuted. 'The walled garden is now a marketplace' is the author's opinion.
Related work
- Inside AI ↗Sep 30, 2026.
- TechNode ↗Sep 30, 2026.
- Baseten ↗Sep 29, 2026.
Watch next
- Read Baseten's post for which open models are available through Codex besides Kimi K3.
Sources
Provenance
The note above is reproduced unedited from the original post, first published on Threads on 1 October 2026 at 06:16 IST. Sources are the papers and datasets the note draws on.
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