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GPT-5.1

Model ● Covered in 7 stories + Follow

GPT-5.1 is an OpenAI GPT-5-series model that has been rolled out to developers via the API and to paid ChatGPT users, with updates aimed at more conversational responses and faster adaptive reasoning. Recent coverage also highlights work around its security posture, including an internal red-teaming system (GPT-Red) that reportedly compromised GPT-5.1 in 84% of scenarios on an indirect prompt-injection benchmark, and developer-facing tooling improvements such as apply_patch, shell tools, and expanded prompt caching. Outside safety and API updates, GPT-5.1 has also been used in evaluations such as a visualization-language study where it achieved higher judge scores than a baseline direct Vega-Lite approach.

Updated 12 September 2026

Specifications

No specifications recorded yet.

Latest developments

The Sequence Radar #897: Last Week in AI: China, Compression and the Open-Model Race Substack · 1 month ago · 38 OpenAI Details GPT-Red: An Internal Automated Red-Teaming Model That Beat Human Red-Teamers 84% To 13% On Prompt Injection MarkTechPost · 2 months ago · 27
Microsoft Research releases Flint, a visualization language for the AI era Microsoft · 2 months ago · 12
How Tolan builds voice-first AI with GPT-5.1 OpenAI · 8 months ago · 47
Update to GPT-5 System Card: GPT-5.2 OpenAI · 9 months ago · 5
Introducing GPT-5.1 for developers OpenAI · 10 months ago · 32
GPT-5.1: A smarter, more conversational ChatGPT OpenAI · 10 months ago · 28

Timeline

Month Quarter Year

2026

Moonshot AI releases Kimi K3, a 2.8 trillion parameter open-weight model achieving frontier-class performance Open source release

OpenAI releases GPT-Red, an automated red-teaming system for identifying vulnerabilities in language models Product launch

2025

OpenAI releases GPT-5.1 model with improved conversational abilities and new developer features Model release

Relationships

Products & technology

  • OpenAI develops this model · 3 sources
  • Derived from GPT-5 · 2 sources
  • Tolan integrated with this model · 1 source

Competition

  • GPT-Red competes with this model · 1 source

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