Overview
- OpenAI introduced two GPT-5.1 variants—Instant for everyday use and Thinking for complex tasks—with auto‑routing between models.
- GPT-5.1 adds eight conversation presets and new controls to tune tone and style, with experiments for direct personality fine‑tuning in settings.
- OpenAI says GPT-5.1 employs adaptive reasoning and posts gains on AIME 2025 and Codeforces, with clearer, less jargony responses.
- The rollout prioritizes paid ChatGPT tiers before reaching free users, and legacy GPT-5 models remain selectable for three months.
- Separately, families allege chatbots can groom children; a wrongful‑death suit by Megan Garcia against Character.ai is pending, and the company declined to comment.