GPT-6.1 Sol review
Replaced GPT-6 Sol a week after launch, at a lower price.
A cheaper way to get close to OpenAI's top model. OpenAI says it matches GPT-6 Astra on long coding tasks at about a fifth of the cost and makes fewer factual mistakes than GPT-6 Sol. Most numbers so far come from OpenAI itself.
What is GPT-6.1 Sol?
GPT-6.1 Sol is an OpenAI model released on 29 September 2026 at OpenAI DevDay, one week after GPT-6 Sol. It sits below GPT-6 Astra, OpenAI's flagship, and is built for coding agents, using a computer, long documents and business automation.
Key features
- Close to GPT-6 Astra on coding and computer use, at a much lower price
- Fewer factual errors: 7.7% against 11.4% for GPT-6 Sol on OpenAI's tests
- Reads about 1 million tokens at once and writes up to 128,000
- Five thinking levels, from low to max
- In Codex and ChatGPT Work on paid plans, the OpenAI API and GitHub Copilot
Specs and price
| Made by | OpenAI |
| Released | 29 Sep 2026 (DevDay) |
| API price | $2 per 1M input tokens, $10 per 1M output tokens |
| Repeated input (cache) | $0.10 per 1M tokens |
| Very long prompts | Over 272,000 tokens: 2x input price and 1.5x output price |
| How much it can read | 1,050,000 tokens (about 780,000 words) |
| Longest answer | 128,000 tokens |
| Where | Codex and ChatGPT Work on Plus, Pro, Business, Enterprise and Edu. Not in regular chat, Free or Go |
| Free to download | No |
| Name in the API | gpt-6.1-sol |
Test scores
| Test | Score | Published by |
|---|---|---|
| DeepSWE v1.1Long, real coding tasks | Matches GPT-6 Astra at about 1/5 of the cost | OpenAI |
| AutomationBenchAutomating business workflows | 2.2 points above Claude Opus 5.5 | OpenAI |
| SEC-Bench ProSecurity tasks | 78.8% (GPT-6 Astra: 85.4%) | OpenAI |
| HealthBench ProfessionalMedical questions | 64.2 (GPT-6 Astra: 64.7) | OpenAI |
| Terminal-Bench Science 0.1Cost per science coding task | $5.47 (Opus 5.5: $23.21) | OpenAI |
Scores published by OpenAI are the maker's own numbers. We will add our own results in the hands-on review.
How to use GPT-6.1 Sol
- In Codex or ChatGPT Work: sign in on a Plus, Pro, Business, Enterprise or Edu plan and pick GPT-6.1 Sol. Enterprise and Edu admins have to turn it on first.
- For developers: use
gpt-6.1-solin the OpenAI API. Tool calling needs the Responses API. - Also available in GitHub Copilot (Pro+, Max, Business, Enterprise) and on OpenRouter.
Who it is for
Good fit
- Developers running coding agents who want near-Astra results for less
- Teams automating office and document work
- Paid ChatGPT users who work in Codex
Skip it if
- Free ChatGPT users: it is not included
- People who need the very best: GPT-6 Astra still scores higher on several tests
Pros and cons
Pros
- Near-flagship results at $2 / $10 per million tokens
- Fewer factual mistakes than GPT-6 Sol
- Huge 1M token memory
- Available almost everywhere: API, Codex, Copilot, OpenRouter
Cons
- Not in regular ChatGPT chat or on free plans
- Prompts over 272K tokens cost a lot more
- Almost all scores come from OpenAI, with no independent re-tests yet
- Tools only work through the Responses API
How it compares
GPT-6.1 Sol costs the same per token as Gemini 4 Argon's launch offer ($2 / $10) and half as much as Claude Opus 5.5 ($4 / $20). OpenAI puts it just above Opus 5.5 on AutomationBench, and says GPT-6 Astra still beats it on security and troubleshooting tests.
Hands-on review In testing
We are running GPT-6.1 Sol on real tasks. Results will be added to this page, at the same address.
How it got here
| Date | What happened | Source type |
|---|---|---|
| Sep 29, 2026 | GPT-6.1 Sol released at DevDay at $2 / $10.DataCamp, GPT-6.1 Sol explained | Confirmed |
| Sep 22, 2026 | GPT-6 Sol and GPT-6 Luna released.Data Lakehouse Hub, AI model families (Oct 2026) | Confirmed |
Frequently asked questions
When was GPT-6.1 Sol released?
On 29 September 2026 at OpenAI DevDay, one week after GPT-6 Sol.
How much does GPT-6.1 Sol cost?
In the API, $2 per million input tokens and $10 per million output tokens. In ChatGPT it is included with Plus, Pro, Business, Enterprise and Edu plans inside Codex and ChatGPT Work.
Is GPT-6.1 Sol free?
No. It is not on the Free or Go plans and cannot be downloaded.
What is the difference between GPT-6.1 Sol and GPT-6 Sol?
Same price, but OpenAI says GPT-6.1 Sol makes fewer factual errors, follows instructions better and scores higher on coding and computer-use tests.
How much text can GPT-6.1 Sol read?
About 1,050,000 tokens in one go, roughly 780,000 words, and it can write up to 128,000 tokens in one answer.
Related models
GPT-6.1 Terra
OpenAIOpenAI says it is close to GPT-6 Astra on many tasks for a tenth of the price per token, at $1 in and $5 out.
GPT-6.1 Luna
OpenAIGPT-6.1 now has Sol and Terra tiers. A cheaper Luna tier is a guess with weak evidence.
GPT-7
OpenAIGPT-6 arrived in September 2026. Markets put GPT-7 in mid 2027.