GPT-5.1

Model ● Covered in 9 stories + Follow

GPT-5.1 is tracked in TLDRocket’s model dataset. Explore the recorded developments, relationships and supporting evidence below. Coverage reflects our monitored sources and may be incomplete.

Updated 28 September 2026

Specifications

No specifications recorded yet.

Latest developments

Market development: Claude Opus 5.5 & Opus 4.5 Simon Willison’s Weblog · 4 days ago · 1 Market development: Claude Opus 4.5 & GPT-5.1 Simon Willison’s Weblog · 1 month ago · 1 Open source release: Thinking Machines & Moonshot AI Substack · 3 months ago · 6 Product launch: OpenAI & GPT-Red MarkTechPost · 3 months ago · 5 Market development: Microsoft Research & OpenAI GPT-5.1 Microsoft · 3 months ago · 4 Market development: Tolan & GPT-5.1 OpenAI · 9 months ago · 7 Market development: OpenAI & GPT-5.2 OpenAI · 10 months ago · 8 Model release: OpenAI & GPT-5.1 OpenAI · 11 months ago · 7

Timeline

Month Quarter Year

Q4 2026

Q3 2026

Open source release: AMD & Alibaba Open source release

Product launch: GPT-Red & OpenAI Product launch

Q1 2026

Q4 2025

Model release: ChatGPT & GPT-5.1 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