Openai's flagship coding agent just started running the competition's weights. codex added glm and…
openai's flagship coding agent just started running the competition's weights. codex added glm and kimi at devday on sept 30, alongside computer use and security scans, so your agent can now be powered by the same open models openai is fighting.
the moat stopped being the model and became the orchestration around it.
Context
Verified date: OpenAI's DevDay 2026 recap is dated Sep 29, 2026, and The Decoder reports Codex expansions including reusable cloud development environments, a voice-controlled CLI and code review. Promtime (Sep 30) says Codex now works with Kimi K3 and GLM-5.3 Flash through Baseten, and that enterprise commitment spending on open models served by Baseten can count toward OpenAI commitments.
Kimi's docs say Codex CLI and the desktop app can connect to Kimi directly through a custom model provider.
Open models in Codex are confirmed, but the sources describe access through Baseten and a custom provider setting, so 'Codex running the competition's weights' is a looser reading of 'Codex can use them'. DevDay was Sep 29 to 30. Computer use and security scans were not seen in the sources read, so unsupported here, not refuted. as Codex additions in the excerpts read, though The Decoder mentions security scans. 'The moat became the orchestration' is the author's opinion.
Related work
- Using Kimi in Codex, Kimi Code Docs ↗Setup instructions.
- The Decoder ↗Sep 29, 2026.
- Promtime ↗Sep 30, 2026.
Watch next
- Read the DevDay recap for the exact list of Codex models and who serves them.
Sources
- DevDay 2026 Recap, OpenAIopenai.com
- OpenAI expands Codex and its API at DevDay, The Decoderthe-decoder.com
- Codex opens up to Kimi K3 and GLM-5.3 Flash via Baseten, Promtimepromtime.net
Provenance
The note above is reproduced unedited from the original post, first published on Threads on 30 September 2026 at 23:19 IST. Sources are the papers and datasets the note draws on.
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