A.I.
Frontier models
GPT-6.1 Sol
GPT-6.1 Sol is an upgrade to GPT-6 Sol, released 29 September 2026. List price is $2 input, $0.10 cached input, and $10 output per million tokens. OpenAI says it is near GPT-6 Astra on coding, computer use, and professional work at one-fifth of Astra’s standard input and output list prices. The API id is gpt-6.1-sol. It is not yet in Chat.
- Status
- Current
- AA score
- 52 (max effort)Artificial Analysis Intelligence Index, one independent score across many tests, fetched 2 Oct 2026
- Price
- $2 in, $10 outUS dollars per million tokens (word pieces) in and out, unless noted
- Released
- 29 Sep 2026
- Last checked
- 5 Oct 2026newest source date on this page
Training
Knowledge cutoff on the model page is 30 April 2026. OpenAI has not published a parameter count for GPT-6.1 Sol on the announce, the model page, or the system-card addendum. The addendum says this model uses the same types of data and training as GPT-6 Astra.
Inference
reasoning.effort supports low, medium (default), high, xhigh, and max. none and minimal are not supported. Reasoning tokens are supported. Use the Responses API for tool calling. Chat Completions is supported without tool calling. OpenAI says GPT-6.1 Sol Ultrafast is coming in the coming days, with up to 8× faster token generation than this model’s standard speed in Codex.
Context
The documented context window is 1,050,000 tokens. Max output is 128,000 tokens. Inputs are text and images. Output is text. Audio and video are not supported.
Methods
GPT-6.1 Sol is in ChatGPT Work and Codex, and on the API as gpt-6.1-sol. It is not yet in Chat. Tools named for this model on the Responses API include web search, file search, image generation, code interpreter, hosted shell, apply patch, skills, computer use, MCP, and tool search. Streaming, function calling, and structured outputs are supported. Fine-tuning is not.
Benchmarking
OpenAI says GPT-6.1 Sol is near GPT-6 Astra on coding, computer use, and professional work at one-fifth of Astra’s standard input and output list prices. On DeepSWE v1.1, OpenAI says it matches Astra at roughly one-fifth the cost and beats GPT-6 Sol’s best score by 6.4 percentage points at a lower reasoning effort.
Artificial Analysis scores GPT-6.1 Sol (max) at 52 on its Intelligence Index, fetched 5 October 2026. That is an independent score, not an OpenAI chart number.
The cell below is OpenAI’s announce chart at High effort. It is a company chart.
| Eval | GPT-6.1 Sol | Notes |
|---|---|---|
| DeepSWE v1.1 | 75.2% | Company announce chart, High effort (0.7522) |
Access and pricing
Available to Plus, Pro, Business, Enterprise, and Edu users in ChatGPT Work and Codex, and to developers on the API as gpt-6.1-sol. Not yet in Chat.
| GPT-6.1 Sol | |
|---|---|
| Input / MTok | $2 |
| Cached input / MTok | $0.10 |
| Cache writes / MTok | $2.50 |
| Output / MTok | $10 |
Prompts with more than 272K input tokens are priced at 2× input and cache rates and 1.5× output for the full request.