GPT-6 Astra
GPT-6 Astra is OpenAI's September 2026 flagship for the hardest end-to-end reasoning, coding, computer use, research, and document work.
Provider
OpenAI
Model family
OpenAI GPT
Multimodal LLM
Cost tier
Astra
Status
Current
Release Sep 3, 2026
Why teams choose it
OpenAI documents gpt-6-astra at $10 input / $1 cached / $12.50 cache write / $50 output per 1M tokens
prompts over 272K input tokens use 2× input/cache and 1.5× output for the full request.
reasoning.effort supports low, medium, high, xhigh, and max
Fast mode is 2× Standard rates and is unavailable with EU data residency.
ChatGPT Plus, Pro, Business, and Enterprise access is a rollout
Enterprise workspaces keep Astra off by default until an admin enables it.
Tradeoffs to know
- Free API tier is unsupported; paid-account access and ChatGPT surfaces roll out gradually.
- Unit price is higher than GPT-5.6 Sol; keep Sol, Terra, or Luna for cheaper GPT-5.6 lanes.
When not to use this
- Critical cyber capability means extra monitoring and access controls; do not treat Astra as an unconstrained red-team model.
Benchmarks
No independent or vendor benchmark scores in this catalog entry.
Technical specs
- Inputs
- text, image
- Outputs
- text
- License
- Proprietary API
- Context tokens
- 1,050,000
- Knowledge Cutoff
- 2026-04-30
- Max output tokens
- 128,000
- Capabilities
- reasoning
- coding
- computer use
- research
- document creation
- function calling
- structured outputs
- web search
- code interpreter
Sourcehttps://developers.openai.com/api/docs/models/gpt-6-astra
OpenAI GPT family lineup
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GPT-6 Astra FAQ
What is GPT-6 Astra?
GPT-6 Astra is OpenAI's September 2026 flagship for the hardest end-to-end reasoning, coding, computer use, research, and document work. The API model ID is gpt-6-astra, with a 1,050,000-token context window, 128,000 max output tokens, text and image input, and reasoning.effort from low through max. OpenAI's safety overview (September 3, 2026) states Astra is the first broadly deployed OpenAI model to reach the Critical cybersecurity capability level under the Preparedness Framework.
When does GPT-6 Astra fit best?
Hardest coding and computer-use agents
What should teams watch out for with GPT-6 Astra?
Free API tier is unsupported; paid-account access and ChatGPT surfaces roll out gradually.
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