GPT-6 Astra
OpenAI's most capable model handles long computer-use, coding and research tasks end to end. Here is what it costs, which ChatGPT plans include it and what it can and cannot create.
Getting access
How to use GPT-6 Astra
The official routes.
ChatGPT paid plans
Plus, Pro, Business, Enterprise and Edu include Astra. Free and Go users get GPT-6 Luna instead.
OpenAI API
Call gpt-6-astra through the Responses or Chat Completions API at $10 / $50 per million tokens.
Want images, not text?
Astra does not draw. LazyKiwi's image generator runs GPT Image 2.5, OpenAI's image model, in the browser.
What it is
What GPT-6 Astra is built for
OpenAI released GPT-6 Astra on September 3, 2026, calling it its most capable model, built for the hardest end-to-end work.
Agentic work
Computer use, browsing and code
OpenAI positions Astra for state-of-the-art computer use, browsing, software engineering, science and professional work, running multi-step workflows across code, the browser and professional software.
- Computer use and browsing
- Software engineering
- Long multi-step tasks
Context
1.05M-token context
Astra accepts up to 1,050,000 tokens of context (922K input) and writes up to 128K tokens. Its knowledge cutoff is April 30, 2026. Reasoning effort runs from low to max.
- 1.05M context
- 128K max output
- Reasoning effort: low to max
Images and video
Text out; images come from GPT Image 2.5
Astra takes text and images in and returns text only. When it makes a picture through the image tool, the image itself comes from GPT Image 2.5 (Flare or Sunburst). OpenAI shut down the Sora 2 video API on September 24, 2026.
- Input: text and images
- Output: text
- Images via GPT Image 2.5
The family
Astra, Sol and Luna
GPT-6.1 Sol (September 29) aims for near-Astra performance at a lower price; GPT-6 Luna (September 22) is the most efficient. All three have a 1.05M-token context.
- Astra: most capable
- Sol: $2 / $10 per 1M tokens
- Luna: $0.10 / $0.50 per 1M tokens
Specs
GPT-6 Astra specs at a glance
From OpenAI's developer documentation, October 2026.
- Developer
- OpenAI
- Released
- September 3, 2026
- Inputs / outputs
- Text and images in, text out
- Context
- 1,050,000 tokens (922K input), 128K output
- Knowledge cutoff
- April 30, 2026
- API price
- $10 input / $50 output per 1M tokens; $1 cached input; input above 272K billed at 2×
- ChatGPT
- Plus, Pro, Business, Enterprise, Edu; Free and Go get Luna
- In LazyKiwi
- Not available; for OpenAI images use GPT Image 2.5
Astra vs Sol vs Luna
GPT-6 Astra vs GPT-6.1 Sol vs GPT-6 Luna
OpenAI API list prices per million tokens.
| Model | Released | Positioning | Input / output price |
|---|---|---|---|
| GPT-6 Astra | Sept 3, 2026 | Most capable, hardest end-to-end work | $10 / $50 |
| GPT-6.1 Sol | Sept 29, 2026 | Near-Astra performance at lower cost | $2 / $10 |
| GPT-6 Luna | Sept 22, 2026 | Most efficient | $0.10 / $0.50 |
FAQ
GPT-6 Astra FAQ
What is GPT-6 Astra?
OpenAI's most capable model, released on September 3, 2026, built for computer use, browsing, software engineering, science and professional work. "GPT Astra" and "Astra GPT-6" refer to the same model.
Is GPT-6 Astra free?
No. In ChatGPT it is included with Plus, Pro, Business, Enterprise and Edu; Free and Go users get GPT-6 Luna. On the API it costs $10 per million input tokens and $50 per million output tokens.
Can GPT-6 Astra generate images or video?
Astra outputs text. It can call the image generation tool, but the images are made by GPT Image 2.5. OpenAI shut down the Sora 2 video API on September 24, 2026.
Opus 5.5 vs GPT Astra: which is better?
It depends on the benchmark. In the table Google published with Gemini 4 Argon, Astra leads Claude Opus 5.5 on FrontierSWE v2 (65.5 vs 62.3) and OSWorld-2.0, while Opus 5.5 leads on Terminal-Bench 4.0 (66.4 vs 58.2). Opus 5.5 lists at $4 / $20 per million tokens against Astra's $10 / $50.
What is the difference between Astra, Sol and Luna?
Astra is the most capable; GPT-6.1 Sol targets near-Astra performance at $2 / $10; GPT-6 Luna is the most efficient at $0.10 / $0.50. All share a 1.05M-token context.
Is GPT-6 Astra available on LazyKiwi?
No. LazyKiwi is an image and video generator; for OpenAI's image model, use GPT Image 2.5 in the image generator.
Is "GPT Astra" the same as GPT-6 Astra?
Yes. "GPT Astra" and "Astra GPT-6" refer to GPT-6 Astra, which OpenAI released on September 3, 2026.
What is GPT-6 Astra's context window?
1,050,000 tokens in total (about 922K input) with up to 128K output tokens. Its knowledge cutoff is April 30, 2026.
How much does the GPT-6 Astra API cost?
$10 per million input tokens and $50 per million output tokens, $1 per million cached input tokens, with input beyond 272K tokens billed at 2×.
Which ChatGPT plans include GPT-6 Astra?
Plus, Pro, Business, Enterprise and Edu. Free and Go users get GPT-6 Luna instead.
Make images with OpenAI's image model
Astra writes and reasons; for pictures, try GPT Image 2.5 in LazyKiwi's image generator.
More models
Image models you can run in LazyKiwi today.