# GPT-6 Astra

> GPT-6 Astra is OpenAI's most capable model, built for complex work across code, apps and research. It runs in ChatGPT, in Codex and on the API as `gpt-6-astra`, with a 1.05M-token context window and 128k max output, at $10 / $50 per 1M input/output tokens.

URL: https://aistack.sh/model/gpt-6-astra
Vendor: OpenAI (product page: https://aistack.sh/tool/chatgpt)
Last checked against sources: 2026-09-24

## Specs

- Status: Available
- API model ID: gpt-6-astra
- API price (in / out): $10 / $50 per 1M tokens
- Cache read: $1 per 1M tokens
- Context window: 1.05M tokens
- Platforms: OpenAI API

## Where you can use it

- ChatGPT (https://aistack.sh/tool/chatgpt): In the ChatGPT desktop app and ChatGPT web. Some paid plans omit the Astra Extra High reasoning setting.
- Codex (https://aistack.sh/tool/codex): In the Codex CLI, IDE extension and Codex cloud.
- OpenAI says availability depends on the rollout, your sign-in method and your client.
- API prices shown are OpenAI's short-context rates; long-context requests are billed higher.

## Comparisons

- [Claude Opus 5.5 vs GPT-6 Astra](https://aistack.sh/compare/claude-opus-5-5-vs-gpt-6-astra)
- [GPT-6 Astra vs GPT-6 Sol](https://aistack.sh/compare/gpt-6-astra-vs-gpt-6-sol)

## FAQ

### How much does GPT-6 Astra cost on the API?

$10 per 1M input tokens, $1 per 1M cached input tokens and $50 per 1M output tokens at OpenAI's short-context rates. Long-context requests cost more.

### What is the GPT-6 Astra context window?

1,050,000 tokens, with up to 128,000 output tokens, according to OpenAI's API model page.

### Where can I use GPT-6 Astra?

OpenAI lists it in the ChatGPT desktop app and on the web, in the Codex CLI, IDE extension and Codex cloud, and on the API. Availability depends on the rollout, your sign-in method and your client.

## Sources

- [OpenAI: ChatGPT and Codex models](https://learn.chatgpt.com/docs/models), read 2026-09-24
- [OpenAI API models](https://developers.openai.com/api/docs/models), read 2026-09-24
- [OpenAI API: GPT-6 Astra](https://developers.openai.com/api/docs/models/gpt-6-astra), read 2026-09-24
- [OpenAI API pricing](https://developers.openai.com/api/docs/pricing), read 2026-09-24