"On Wednesday, OpenAI released GPT-5.1 Instant and GPT-5.1 Thinking, two updated versions of its flagship AI models now available in ChatGPT. The company is wrapping the models in the language of anthropomorphism, claiming that they're warmer, more conversational, and better at following instructions. The release follows complaints earlier this year that its previous models were excessively cheerful and sycophantic, along with an opposing controversy among users over how OpenAI modified the default GPT-5 output style after several suicide lawsuits."
"The new GPT-5.1 Instant model will serve as ChatGPT's faster default option for most tasks, while GPT-5.1 Thinking is a simulated reasoning model that attempts to handle more complex problem-solving tasks. OpenAI claims that both models perform better on technical benchmarks such as math and coding evaluations (including AIME 2025 and Codeforces) than GPT-5, which was released in August. Improved benchmarks may win over some users, but the biggest change with GPT-5.1 is in its presentation."
OpenAI released two updated models, GPT-5.1 Instant and GPT-5.1 Thinking, in ChatGPT. GPT-5.1 Instant is positioned as a faster default for most tasks and GPT-5.1 Thinking is aimed at simulated reasoning for complex problems. Both models claim improved performance on technical benchmarks including math and coding evaluations such as AIME 2025 and Codeforces compared with GPT-5. The release adds eight preset communication styles that alter prompt instructions without changing core capabilities. The Instant model also uses adaptive reasoning to decide when to spend more computation time on a prompt. The company faces regulatory and legal scrutiny amid the rollout.
Read at Ars Technica
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