GPT-6 Astra
GPT-6 Astra is an OpenAI model released on September 3, 2026, with the API ID gpt-6-astra.
- Lab
- OpenAI
- Release date
- Status
- Generally available
- API model ID
- gpt-6-astra
- Context window
- 1,050,000 tokens
- Max output
- 128,000 tokens
OpenAI released GPT-6 Astra on September 3, 2026, the date in the OpenAI API changelog, which calls it OpenAI’s most capable model for reasoning, coding, computer use and research. OpenAI’s model docs list it as gpt-6-astra with a 1,050,000-token context window, 128,000 max output tokens, text and image input with text output, and an April 30, 2026 knowledge cutoff.
OpenAI said it would roll out first to a limited set of organizations and then to ChatGPT Plus, Pro, Business and Enterprise users, the OpenAI API, Microsoft Azure and Amazon Bedrock; Enterprise admins enable it per workspace. On September 29, 2026, OpenAI added an Ultrafast mode for it in the Responses API.
- Modalities
- Text and image input; text output
- Knowledge cutoff
- April 30, 2026
- Availability
- ChatGPT Plus, Pro, Business and Enterprise (Enterprise admins enable it per workspace); OpenAI API; Microsoft Azure; Amazon Bedrock. Rollout started with a limited set of organizations.
- Official source
- openai.com
- Last checked
Questions
When was GPT-6 Astra released?
What is the context window of GPT-6 Astra?
Where is GPT-6 Astra available?
Does GPT-6 Astra have an Ultrafast mode?
Source
Release dates, model IDs and limits come from each lab’s own announcement, changelog, documentation or deprecations page, linked on every model with the date it was last checked. How we pick and check sources: editorial standards.