"GPT-5.1 arrived in the API just a day after its ChatGPT release and is now integrated into the Codex coding agent along with new development tools. Built on the GPT-5 architecture, it inherits strong long-context reasoning, enabling deep repository analysis and high-quality patch generation. On benchmarks, GPT-5.1 shows consistent gains over GPT-5. In SWE-bench Verified-where models fix real bugs-it achieved 76.3%, up from 72.8%, placing it among the best coding models available."
"OpenAI also upgraded Codex with gpt-5.1-codex and gpt-5.1-codex-mini, tuned for long code analysis and agent workflows. Two major tools were added to the API: These updates are already being integrated into IDEs and agent systems that rely on multi-step edits and test-driven feedback loops. API pricing for GPT-5.1 Thinking remains the same as GPT-5: Prompt caching now lasts 24 hours, reducing costs for long sessions and large-project coding workflows."
The JavaScript ecosystem continues to evolve rapidly, with selected tools, releases, and breakthroughs shaping developer workflows and performance practices across frontend and backend. GPT-5.1 arrived in the API and integrated into the Codex coding agent, offering strong long-context reasoning for deep repository analysis and high-quality patch generation. Benchmarks show gains over GPT-5, including 76.3% on SWE-bench Verified and improvements on MMMU, GPQA, and Tau²-bench, positioning GPT-5.1 alongside leading coding models. OpenAI added gpt-5.1-codex and gpt-5.1-codex-mini plus two major API tools, with IDE and agent integrations. API pricing for GPT-5.1 Thinking remains unchanged and prompt caching now lasts 24 hours. Google released a 50-page guide on building practical AI agents covering architecture, tool integration, coordination, and evaluation.
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