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GPT-5.1 Instant and GPT-5.1 Thinking: a GPT‑5 upgrade with adaptive reasoning — Instant for fast conversational replies and Thinking for dynamic, precise reasoning.

GPT-5.1 Instant and GPT-5.1 Thinking: a GPT‑5 upgrade with adaptive reasoning — Instant for fast conversational replies and Thinking for dynamic, precise reasoning.
GPT-5.1 is the next iteration of OpenAI's GPT-5 family, split into two primary variants: GPT-5.1 Instant (optimized for fast, conversational responses with adaptive reasoning) and GPT-5.1 Thinking (which dynamically adapts thinking time to question complexity). The models introduce an adaptive reasoning capability that lets the model decide when to 'think' before responding and a new explicit reasoning mode 'none' to force no reasoning tokens for faster responses and improved compatibility with hosted tools. Developers get API access to gpt-5.1-chat-latest, specialized codex variants (gpt-5.1-codex and gpt-5.1-codex-mini) optimized for long-running, agentic coding tasks, and integration features like Auto routing that dispatches queries to the best-suited model. Compared to prior GPT-5 models, GPT-5.1 improves instruction-following, coding quality, token efficiency on simple tasks, and offers more steerability and safer guardrails documented in the system card addendum.


