We’re updating GPT-5 to GPT-5.1 Instant and GPT-5.1 Thinking, making answers both smarter and more conversational. GPT-5.1 Instant now uses light adaptive reasoning for tougher questions while staying fast, and GPT-5.1 Thinking adapts its thinking time more precisely for complex tasks with clearer, less jargony responses.
GPT-5.1 Auto continues to route each query to the best model, and GPT-5 models remain available for three months under the Legacy models dropdown so you can compare and transition at your own pace.
GPT-5.1 Instant and Thinking are rolling out first to paid (Pro, Plus, Go, Business) users, then to free and logged-out users, with Enterprise and Edu getting a temporary early-access toggle; GPT-5.1 will also be available soon in the API as gpt-5.1-chat-latest (Instant) and gpt-5.1 (Thinking).