Release Notes

We’ve updated the Model Spec, our living document outlining intended model behavior.

This update adds additional clarity around principles on appropr...

GPT-5.6 Sol, a flagship reasoning model for complex work across coding, research, science, cybersecurity, computer use, and design, is rolling out to eligible paid ChatGPT plans. The model offers smarter problem-solving in STEM and coding, enhanced instruction-following and formatting accuracy.

Continuing to retire older models with limited usage in ChatGPT. OpenAI o3 will be retired from ChatGPT on August 26, 2026 following a 90-day sunset p...

Updated GPT-5.5 Instant in ChatGPT and the API to improve response style and quality. Responses are now easier to read, more natural in everyday conve...

Rolling out GPT-5.4 mini in ChatGPT. GPT-5.4 mini is available to Free and Go users via the "Thinking" feature in the + menu. For all other users, GPT...

Rolling out an update to GPT-5.3 Instant that improves follow-up tone and reduces teaser-style phrasing in responses (e.g., "If you want…", "You'll ne...

As of March 11, 2026, GPT-5.1 models are no longer available in ChatGPT. This applies to GPT-5.1 Instant, GPT-5.1 Thinking, and GPT-5.1 Pro. Existing ...

GPT-5.4 brings together the best of recent advances in reasoning, coding, and agentic workflows into a single frontier model. It incorporates industry...

Retired GPT-4o, GPT-4.1, GPT-4.1 mini, and OpenAI o4-mini from ChatGPT. Also retiring GPT-5 (Instant and Thinking), as previously announced. There are...

Making an update to GPT-5.2 Instant in ChatGPT and the API that improves response style and quality. Responses are now more measured and grounded in t...

Launched GPT-5.3-Codex, the most capable agentic coding model yet. This model is the first that combines Codex + GPT-5 training stacks, bringing toget...

Series of updates to thinking time settings for GPT-5.2 Thinking:

• January 10, 2026: Lowered Standard and Light thinking time as users prefer faster...

Updating GPT-5.2 Instant's default personality to be more conversational and better at adapting its tone contextually, making exchanges feel smoother ...

Updated the Model Spec to strengthen and more clearly codify the principles that reflect how OpenAI builds experiences for teen users.

**New section:...

Introducing a new GPT-5-Codex-Mini model option to Codex CLI and the IDE Extension. The model is a smaller and more cost-effective version of GPT-5-Co...

GPT-5.1-Codex-Max is a new frontier agentic coding model built for long-running, project-scale work. It's faster, more capable, and more token-efficie...

Updating GPT-5 Instant to better recognize and support people in moments of distress. The model is trained to more accurately detect and respond to po...

GPT-5-codex is now available in the Responses API, in addition to codex surfaces. Note: GPT-5-Codex is not currently supported in ChatGPT.

Adding GPT-5-codex, a GPT-5 variant optimized for agentic coding in Codex. It's available everywhere you use Codex: default for cloud tasks and code r...

Updated the Model Spec to better reflect how OpenAI's systems are evolving, focusing on strengthening clarity and guardrails as models move beyond cha...