What is the price difference between GPT-6 Astra and GPT-6 Sol?
Astra is $10 input and $50 output per 1M tokens; Sol is $2 and $10. Astra costs 5x as much at OpenAI's short-context rates.
Model vs model
GPT-6 Astra vs GPT-6 Sol
GPT-6 Astra costs $10/$50 and GPT-6 Sol costs $2/$10 per 1M input/output tokens on the API.
· today
Quick answer
Start with GPT-6 Sol: it is the Codex default, built for complex coding and agentic workflows, and costs $2 / $10 per 1M tokens. Step up to GPT-6 Astra, OpenAI's most capable model, for the hardest end-to-end work, at 5x the price ($10 / $50).
GPT-6 Astra vs GPT-6 Sol specs
| Spec | GPT-6 Astra | GPT-6 Sol |
|---|---|---|
| Released | - | Sep 22, 2026 |
| Status | Available | Rolling out |
| API model ID | gpt-6-astra | gpt-6-sol |
| API price (in / out) | $10 / $50 per 1M tokens | $2 / $10 per 1M tokens |
| Cache read | $1 per 1M tokens | $0.20 per 1M tokens |
| Context window | 1.05M tokens | 1.05M tokens |
| Plans | - | Plus, Pro, Business, Enterprise, Edu |
| Platforms | OpenAI API | OpenAI API |
| Runs in | ChatGPT, Codex | Codex, ChatGPT |
"-" means we could not verify the value on a vendor page, not that it doesn't exist.
GPT-6 Astra vs GPT-6 Sol FAQ
Which one does Codex use by default?
GPT-6 Sol, starting on the Sol Light preset. Astra is available in the Codex CLI, IDE extension and Codex cloud, but you pick it yourself.
Do they have different context windows?
No. OpenAI lists 1.05M tokens for both.
Also compared
Sources
- OpenAI: ChatGPT and Codex modelsread 2026-09-24
- OpenAI API modelsread 2026-09-24
- OpenAI API: GPT-6 Astraread 2026-09-24
- OpenAI API pricingread 2026-09-24
- OpenAI: ChatGPT Work and Codex changelogread 2026-09-24