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The Codex Changelog · October 1 · 6 min

Codex 0.159.1 Swaps in GPT 6.1 Sol

Codex 0.159.1 quietly changes the default model to GPT 6.1 Sol, bringing lower costs, a new service-tier behavior, and low default reasoning effort for faster sessions. We also cover the follow-up fixes in 0.159.2 and 0.159.3, plus the rollout caveats that could leave teams on older models without realizing it. Show Notes Releases · openai/codex - GitHub: https://github.com/openai/codex/releases ChatGPT & Codex changelog: https://learn.chatgpt.com/docs/changelog

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Codex 0.159.1 quietly changes the default model to GPT 6.1 Sol, bringing lower costs, a new service-tier behavior, and low default reasoning effort for faster sessions. We also cover the follow-up fixes in 0.159.2 and 0.159.3, plus the rollout caveats that could leave teams on older models without realizing it.

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