OpenAI Blog · Sep 15, 2025
Addendum to GPT-5 system card: GPT-5-Codex
Reviewed by Errol Vogt, Site support technician & online learning analyst · original summary · editorial policy
Addendum to GPT-5 system card: GPT-5-Codex. This addendum to the GPT-5 system card shares a new model: GPT-5-Codex, a version of GPT-5 further optimized for agentic coding in Codex. GPT-5-Codex adjusts its thinking effort more dynamically based on task complexity, responding quickly to simple conversational queries or small tasks, while independently working for longer on more complex tasks. This update is relevant for small-office operators tracking changes in their tools.
Operator takeaway: For operators: review whether 'Addendum to GPT-5 system card: GPT-5-Codex' affects your current setup before relying on it in production.
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