SI Model · OpenAI
GPT-6.1 Sol
| Developer | OpenAI |
|---|---|
| Released | September 29, 2026 |
| Status | Current |
| Inputs | Text, Images |
| Context window | 1.1M tokens |
| API price (input) | $2 / 1M tokens |
| API price (output) | $10 / 1M tokens |
| Open weights | No |
| Access | ChatGPT (paid plans), Codex, OpenAI API |
Specs and list prices last verified October 7, 2026. Prices change often; check the provider before you buy.
Strengths
- Near-flagship quality at $2/$10
- Cached input at $0.10 per million tokens
- About 1.05M-token context
Best for
- Production apps that need strong quality at scale
- Coding assistants and agents on a budget
- High-volume document work
GPT-6.1 Sol is OpenAI’s answer to the question most businesses actually ask: how much quality do I get per dollar? Released on September 29, 2026, a week after GPT-6 Sol, it costs $2 per million input tokens and $10 per million output tokens, a fifth of GPT-6 Astra’s price. OpenAI’s pitch: “Near-Astra intelligence for a fifth of the price.”
Highlights
- OpenAI says it nearly matches Astra on agentic coding, computer use and professional work.
- Cached input costs just $0.10 per million tokens, useful for apps that reuse long prompts.
- About a 1.05-million-token context window.
- Available in paid ChatGPT plans, Codex and the API.
Competitors
GPT-6.1 Sol lands in the same price bracket as Anthropic’s Claude Sonnet 5.5 ($2/$10). Compare them in GPT-6.1 Sol vs Claude Sonnet 5.5. xAI’s Grok 4.7 is a lower-priced alternative for prompts under 200K tokens.
Frequently asked questions
When was GPT-6.1 Sol released?
September 29, 2026, at OpenAI's DevDay, one week after GPT-6 Sol.
Is GPT-6.1 Sol cheaper than Claude Sonnet 5.5?
Their list prices are the same: $2 per million input tokens and $10 per million output tokens. Caching discounts and real token usage on your workload decide which is cheaper in practice.
Sources
- OpenAI API models — OpenAI
- OpenAI releases GPT-6.1 Sol at a fifth of GPT-6 Astra's token prices — The Next Web, September 29, 2026
Written by
Luka Kušec · Editor
Editor of SI.info. Writes about Super Intelligence, technology policy and the people building frontier models.