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Introducing GPT-5.1 for developers

OpenAI Blog 13 November 2025, 00:00 ● Covered by 3 sources

OpenAI released GPT-5.1 through its API with faster adaptive reasoning capabilities and extended prompt caching. The model includes new apply_patch and shell tools alongside improvements to coding performance. Developers can now use these enhanced features for faster inference and reduced token usage through expanded caching options.

Why it matters

GPT-5.1 is now available in the API, bringing faster adaptive reasoning, extended prompt caching, improved coding performance, and new apply_patch and shell tools.

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TLDRocket 21 July 2026

The open-weight AI model market hit an inflection point today as Alibaba and Kimi released trillion-parameter competitors that challenge the closed-model orthodoxy—just as Washington moved to restrict them. Alibaba's Qwen 3.8 Max (2.4 trillion parameters) and Kimi K3 (2.8T) are going open-weight, with K3 ranking first on Frontend Web App Arena and fourth on agentic benchmarks, signaling that scale and transparency can coexist. The timing matters: while U.S. policymakers weigh layered restrictions on Chinese open models, technical experts are pushing back hard, arguing that closed gardens actually hurt security and competition more than they help. The real fragmentation risk isn't technical—it's regulatory.

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Introducing GPT-5.1 for developers

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