"OpenAI recently released upgrades to their GPT-5 model. GPT‑5.1 Instant, the default chat model, has improvements to instruction following. GPT‑5.1 Thinking, the reasoning model, is faster and gives more understandable responses. GPT‑5.1-Codex-Max, the coding model, is trained to use compaction to perform long-running tasks. The Instant and Thinking models are used in the ChatGPT application, and are chosen automatically by an auto-routing model."
"While the company continues to have ChatGPT automatically choose the best model for a chat, OpenAI reversed its plan to immediately deprecate older models. According to OpenAI: Going forward, when we introduce new ChatGPT models, our approach is to give people ample space to evaluate what's changed and share feedback, allowing us to continue innovating our frontier models while transitioning smoothly. Sunset periods will be communicated clearly and with plenty of advance notice."
OpenAI upgraded GPT-5 to GPT-5.1 with three variants: Instant for improved instruction following, Thinking for faster, clearer reasoning, and GPT-5.1-Codex-Max for long-running coding via compaction. Instant and Thinking are auto-selected in ChatGPT using an auto-routing model. Default responses were adjusted toward a more conversational style based on user preference, and new customization controls enable tone and style changes through presets and personalization. Three new presets—Quirky, Candid, and Professional—were added. OpenAI paused immediate deprecation of older models and committed to clear sunset periods and phased fine-tuning rollouts.
Read at InfoQ
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