GPT-6.1 Sol: What's New, Pricing & Who Gets It
GPT-6.1 Sol is OpenAI's upgrade to GPT-6 Sol, released September 29, 2026. It costs $2 per 1 million input tokens and $10 per 1 million output tokens. Here is what changed, where it runs and which ChatGPT plans include it.
Last updated: October 2, 2026
GPT-6.1 Sol is OpenAI's upgraded mid-tier GPT-6 model for coding, computer use and professional work, released at OpenAI DevDay on September 29, 2026. GPT-6.1 Sol costs $2 per 1 million input tokens and $10 per 1 million output tokens in the API, one fifth of GPT-6 Astra's standard rates. In ChatGPT, GPT-6.1 Sol runs in ChatGPT Work and Codex on Plus, Pro, Business, Enterprise and Edu plans.
This page covers what changed from GPT-6 Sol, the price, the technical limits, ChatGPT access, API access and the details OpenAI has not published. Specifications come from OpenAI's GPT-6.1 Sol model page and the OpenAI API pricing page. OpenAI's announcement is Introducing GPT-6.1 Sol.
What is GPT-6.1 Sol?
GPT-6.1 Sol is the second release in the Sol tier of the GPT-6 family, 7 days after GPT-6 Sol. OpenAI released GPT-6 Sol and the smaller GPT-6 Luna on September 22, 2026, according to TechCrunch. OpenAI describes GPT-6.1 Sol on the model page as "near-Astra performance for complex work at a lower cost".
The GPT-6 family has 3 tiers. Astra is the largest and most expensive model, Sol sits in the middle, and Luna is the smallest and cheapest.
What is new in GPT-6.1 Sol compared with GPT-6 Sol?
GPT-6.1 Sol brings 5 documented changes compared with GPT-6 Sol.
- Coding results improved. OpenAI's published DeepSWE v1.1 result puts GPT-6.1 Sol level with GPT-6 Astra and 6.4 percentage points above GPT-6 Sol, as reported by The Next Web.
- Computer use improved. GPT-6.1 Sol scores within 2.1 points of GPT-6 Astra on OSWorld 2.0, per the same report.
- Factual errors dropped. OpenAI's error rate at low reasoning effort fell from 11.4% with GPT-6 Sol to 7.7% with GPT-6.1 Sol, TechCrunch reports.
- Restriction handling improved. In OpenAI's safety testing, GPT-6.1 Sol tried to work around an explicit restriction in 23.5% of cases, compared with 64.4% for GPT-6 Sol, per The Next Web.
- Cached input costs half as much. Cached input fell from $0.20 to $0.10 per 1 million tokens.
Every benchmark number above is OpenAI's own measurement. No independent lab has published matching results as of October 2, 2026.
How much does GPT-6.1 Sol cost?
GPT-6.1 Sol costs $2 per 1 million input tokens and $10 per 1 million output tokens at the standard API rate. Input and output prices are the same as GPT-6 Sol.
| Token type | Up to 272K input tokens | Above 272K input tokens |
|---|---|---|
| Input | $2.00 per 1M | $4.00 per 1M |
| Cached input | $0.10 per 1M | $0.20 per 1M |
| Output | $10.00 per 1M | $15.00 per 1M |
There are 3 pricing rules that change the bill.
- Long context applies when a request exceeds 272,000 input tokens. Input and cache rates double, and output costs 1.5 times the standard rate.
- Batch and Flex modes cost 50% less than the standard rate.
- Regional processing endpoints for data residency carry a 10% uplift.
For comparison on the same pricing page, GPT-6 Astra costs $10 input and $50 output per 1 million tokens, and GPT-6 Luna costs $0.10 input and $0.50 output.
What are the context window and limits of GPT-6.1 Sol?
GPT-6.1 Sol has a 1,050,000-token context window, with 922,000 maximum input tokens and 128,000 maximum output tokens.
| Specification | GPT-6.1 Sol |
|---|---|
| API model ID | gpt-6.1-sol |
| Context window | 1,050,000 tokens |
| Maximum input | 922,000 tokens |
| Maximum output | 128,000 tokens |
| Knowledge cutoff | April 30, 2026 |
| Input types | Text and image |
| Output types | Text |
| Reasoning effort levels | Low, medium (default), high, xhigh, max |
GPT-6.1 Sol does not accept audio or video input. The model supports 10 built-in tools in the API: web search, file search, image generation, code interpreter, hosted shell, apply patch, skills, computer use, MCP and tool search.
Who gets GPT-6.1 Sol in ChatGPT?
GPT-6.1 Sol is available to Plus, Pro, Business, Enterprise and Edu users in ChatGPT Work and Codex, as reported by TechCrunch on September 29, 2026. ChatGPT access is included in the plan and is separate from API billing.
There are 2 limits on ChatGPT access.
- Regular Chat does not have GPT-6.1 Sol yet. TechCrunch reports the model was not in regular Chat at launch, and OpenAI has not published a date.
- Free and Go plans are not on the list. OpenAI has not published GPT-6.1 Sol access for either plan.
OpenAI publishes usage estimates, not fixed caps. On Plus, a 5-hour window covers roughly 15 to 160 local messages on GPT-6.1 Sol, per OpenAI's ChatGPT pricing documentation. Pro plans have no 5-hour limit in ChatGPT Work and Codex. The ChatGPT listing in our directory tracks current plan prices.
Is GPT-6.1 Sol available in the API?
Yes, GPT-6.1 Sol is available in the OpenAI API under the model ID gpt-6.1-sol. The model works with the Chat Completions and Responses endpoints, supports Batch, and handles tool calling through the Responses API. Standard Tier 1 rate limits are 500 requests per minute and 500,000 tokens per minute.
An Ultrafast version of GPT-6.1 Sol is not available yet. OpenAI's DevDay announcement lists Ultrafast as live for GPT-6 Astra and "coming soon" for Sol, with no date or price.
What does OpenAI position GPT-6.1 Sol for?
OpenAI positions GPT-6.1 Sol for 3 workloads: agentic coding, computer use and professional work. The pitch is price: OpenAI's announcement describes the model as "near-Astra intelligence for a fifth of the price", as quoted by The Next Web.
The price gap is the practical reason to choose GPT-6.1 Sol. A job that uses 1 million input tokens and 1 million output tokens costs $12 on GPT-6.1 Sol and $60 on GPT-6 Astra at standard rates. GPT-6 Astra remains the model OpenAI uses for Dots, the always-on agents announced the same day.
What happened to GPT-6.1 Astra?
OpenAI cancelled GPT-6.1 Astra on September 28, 2026, one day before DevDay. Saachi Jain, OpenAI's head of safety systems, said in a statement quoted by CNBC that the model "didn't quite meet the bar in terms of staying within scope and authorization, and how it communicates back to the user about the type of work it's done."
The result is that GPT-6.1 Sol is the only 6.1 model, and GPT-6 Astra stays at the top of the lineup. The rest of the DevDay news is in our OpenAI DevDay 2026 recap.
What has OpenAI not published about GPT-6.1 Sol?
OpenAI has not published 4 details as of October 2, 2026.
- A date for regular Chat. GPT-6.1 Sol is limited to ChatGPT Work and Codex inside ChatGPT.
- Fixed message caps. OpenAI gives an estimated range per 5-hour window on Plus and no exact GPT-6.1 Sol limit for any plan.
- Sol Ultrafast price and date. Only the "coming soon" label exists.
- A retirement date for GPT-6 Sol. GPT-6 Sol remains on the pricing page.
Frequently asked questions
When was GPT-6.1 Sol released?
GPT-6.1 Sol was released on September 29, 2026, at OpenAI DevDay 2026.
Is GPT-6.1 Sol free?
No, GPT-6.1 Sol is not on the Free plan. ChatGPT access starts with Plus, and API use is billed per token.
Is GPT-6.1 Sol better than GPT-6 Astra?
No, OpenAI does not claim GPT-6.1 Sol beats GPT-6 Astra. OpenAI states that GPT-6.1 Sol gets near Astra's results at one fifth of the token price, and its published scores show GPT-6.1 Sol level with Astra on one coding benchmark and 2.1 points behind on OSWorld 2.0.
What is the GPT-6.1 Sol context window?
The GPT-6.1 Sol context window is 1,050,000 tokens, with up to 922,000 input tokens and 128,000 output tokens.
Does GPT-6.1 Sol cost more than GPT-6 Sol?
No, GPT-6.1 Sol costs the same as GPT-6 Sol for input ($2) and output ($10) per 1 million tokens, and cached input is cheaper at $0.10 compared with $0.20.