Release Notes

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 period, and GPT-4.5 will be retired from ChatGPT on June 27, 2026 following a 30-day sunset period. These models are currently…

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 conversations, and better paced in practical help tasks, with fewer overly long or bullet-heavy responses.

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-5.4 mini is available as a rate limit fallback for GPT-5.4 Thinking.

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 never believe…", "I can tell you these three things that…").

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 conversations that used GPT-5.1 will automatically continue on the corresponding current model: GPT-5.3 Instant, GPT-5.4…

GPT-5.4 brings together the best of recent advances in reasoning, coding, and agentic workflows into a single frontier model. It incorporates industry-leading coding capabilities while improving how the model works across tools, software environments, and professional tasks…

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 no API changes at this time.

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 tone, in a way that's more contextually appropriate to the conversation. The model also tends to output clearer, more relevant…

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 together best-in-class code generation, reasoning, and general-purpose intelligence in one unified model. It's approximately 25%…

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

Updating GPT-5.2 Instant's default personality to be more conversational and better at adapting its tone contextually, making exchanges feel smoother and more natural. Users can still select a different base style and tone for ChatGPT, along with tuning characteristics like…

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

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-efficient than GPT-5.1-Codex, using compaction to work coherently across multiple context windows. Available in Codex surfaces including…

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-Codex that provides up to 4x more usage as part of your ChatGPT subscription.

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 potential signs of mental and emotional distress, guided by mental health experts. It helps ChatGPT de-escalate conversations and…

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 review, and selectable for local workflows via the Codex CLI and IDE extension. Use GPT-5-codex for coding-focused work in Codex,…

Updated the Model Spec to better reflect how OpenAI's systems are evolving, focusing on strengthening clarity and guardrails as models move beyond chat into more agentic use cases.

GPT-5 is slowly rolling out to all users on ChatGPT Plus, Pro, Team, and Free plans worldwide across web, mobile, and desktop. GPT-5 will be available to ChatGPT Enterprise and Edu plans soon.