# GPT-6 Sol

> GPT-6 Sol is OpenAI's GPT-6 model for complex coding and agentic workflows, rolling out from September 22, 2026 to Codex and ChatGPT Work on Plus, Pro, Business, Enterprise and Edu. It is the Codex default and costs $2 / $10 per 1M input/output tokens on the API, with a 1.05M-token context window.

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

## Specs

- Released: Sep 22, 2026
- Status: Rolling out
- API model ID: gpt-6-sol
- API price (in / out): $2 / $10 per 1M tokens
- Cache read: $0.20 per 1M tokens
- Context window: 1.05M tokens
- Plans: Plus, Pro, Business, Enterprise, Edu
- Platforms: OpenAI API

## Where you can use it

- Codex (https://aistack.sh/tool/codex): The Codex default, starting on the Sol Light preset. Pick it with `/model` or `codex --model gpt-6-sol`.
- ChatGPT (https://aistack.sh/tool/chatgpt): In ChatGPT Work on the web and in the desktop app.
- API prices shown are OpenAI's short-context rates; long-context requests are billed higher.

## Comparisons

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

## FAQ

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

$2 per 1M input tokens, $0.20 per 1M cached input tokens and $10 per 1M output tokens at OpenAI's short-context rates.

### Is GPT-6 Sol the default in Codex?

Yes. OpenAI's changelog says Sol is the Codex default, and the models page says Sol Light is the starting preset. Switch with `/model` or `codex --model gpt-6-sol`.

### Which ChatGPT plans get GPT-6 Sol?

Plus, Pro, Business, Enterprise and Edu, in Codex and ChatGPT Work, per OpenAI's September 22, 2026 changelog entry.

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

1.05M tokens, according to OpenAI's API models page.

## Sources

- [OpenAI: ChatGPT Work and Codex changelog](https://learn.chatgpt.com/docs/changelog), read 2026-09-24
- [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 pricing](https://developers.openai.com/api/docs/pricing), read 2026-09-24