What New Features GPT-5.1 Brings to ChatGPT

OpenAI officially released GPT-5.1 Yesterday, offering enhanced reasoning, speed, and customization over the previous GPT-5 model.

The update introduces two modes: Instant for rapid responses and Thinking for multi-step reasoning, deep logic, and complex problem-solving scenarios.

Thinking mode delivers equal quality to GPT-5 while using only half the token budget, reducing costs and improving task efficiency.

GPT-5.1 automatically adjusts “thinking time” based on query complexity, offering instant replies for simple tasks and careful computation for complex ones.

Developers can select no-reasoning mode, turning GPT-5.1 into an ultra-fast responder for lightweight tasks or high-frequency real-time chatbot workflows.

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The model features apply_patch, multi-file updates, and integrated shell-command support, streamlining debugging, code reviews, and automated development tasks efficiently.

GPT-5.1 includes stylistic presets such as Friendly, Professional, Quirky, and Nerdy, enabling consistent conversational character for enterprise, education, or brand applications.

Benchmarks show GPT-5.1 outperforms GPT-5 in coding, reasoning, instruction following, and tone consistency, while significantly reducing hallucinations in multi-step workflows.

Microsoft Copilot Studio and other enterprise platforms have integrated GPT-5.1, improving automation, agent workflows, and productivity without increasing costs or complexity.