Quick answer
- Released
- September 29, 2026
- API model
- gpt-6.1-sol
- Price
- $2 in / $10 out per MTok; $0.10 cached input; long-context rates apply above 272K input tokens
- Context
- 1,050,000 tokens (128K max output)
GPT-6.1 Sol: verified facts
| Field | Verified value |
|---|---|
| Vendor | OpenAI |
| Release | September 29, 2026 |
| API identifier | gpt-6.1-sol |
| Input / output price | $2 in / $10 out per MTok |
| Cache / fast pricing | $0.10 cached input; long-context rates apply above 272K input tokens |
| Context / max output | 1,050,000 tokens (128K max output) |
| Availability | OpenAI's recommended Codex model for complex coding, rolling out to Plus, Pro, Business, Enterprise and Edu |
Every number on this page was checked against the linked vendor documentation on September 30, 2026. Prices are API list prices per million tokens; product subscriptions and regional availability are separate.
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Where this model fits
OpenAI recommends GPT-6.1 Sol for complex coding and agentic workflows and describes it as near-Astra performance at one fifth of Astra's token price ($2/$10 vs $10/$50 per MTok). It replaced GPT-6 Sol as the newer Sol at the same list price, with cached input at $0.10 instead of $0.20, reasoning effort from low to max (no none or minimal), a knowledge cutoff of April 30, 2026, and up to 922K input tokens inside its 1.05M window. In Codex it is rolling out to Plus, Pro, Business, Enterprise and Edu: Enterprise and Edu admins must enable it, Free and Go plans are not included at launch, and Ultrafast mode is limited to the $500 Pro plan and eligible Enterprise and Edu plans. GPT-6 Sol stays selectable in Codex meanwhile.
When to use it
Use case 1
Use case 2
Use case 3
| Strengths | Trade-offs |
|---|---|
| OpenAI's recommended model for complex coding and agentic workflows in Codex | Does not support the none or minimal reasoning efforts; start at low |
| Same $2/$10 base price as GPT-6 Sol, with cached input halved to $0.10 | Tool calling requires the Responses API |
| 1.05M-token context and 128K maximum output | Not included on Free and Go plans at launch; Enterprise and Edu admins must enable it |