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GPT-5.1 Instant and GPT-5.1 Thinking System Card Addendum

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This GPT-5 system card addendum provides updated safety metrics for GPT-5. 1 Instant and Thinking, including new evaluations for mental health and emotional reliance.

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OpenAI Blog
Sep 15, 2025

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.