GPT-6.1 Sol — Specifications
Compiled by Mustafa Ihsan from the vendor’s published documentation · Last updated
| Developer | OpenAI |
|---|---|
| Type | Reasoning / agentic |
| Modality | Text, vision |
| Parameters | Undisclosed |
| License | Proprietary |
| Open weights | No |
| Released | 2026-09 |
| Input price | $2.00 /1M |
| Output price | $10.00 /1M |
| API providers | OpenAI API |
Benchmarks
| OpenAI-reported | DeepSWE v1.1 matches GPT-6 Astra (6.4 pts above GPT-6 Sol); AutomationBench 1.0.6 +2.2 pts vs Claude Opus 5.5 (medium); Terminal-Bench Science 0.1 $5.47/task at max effort |
|---|
What is GPT-6.1 Sol?
GPT-6.1 Sol is OpenAI’s upgrade to GPT-6 Sol, launched at DevDay on 29 September 2026. According to OpenAI, it nearly matches GPT-6 Astra on agentic coding, computer use and professional work at one-fifth of Astra’s token prices, matches Astra on DeepSWE v1.1, and cuts the share of answers with a factual error from 11.4% to 7.7% versus GPT-6 Sol at low effort on hard prompts.
API pricing is $2 per million input tokens and $10 output, with cached input at $0.10. In ChatGPT it is available to Plus, Pro, Business, Enterprise and Edu users in ChatGPT Work and Codex (not yet in Chat), and to developers as gpt-6.1-sol. OpenAI released it in place of GPT-6.1 Astra, which it held back after internal safety tests.
GPT-6.1 Sol pricing: API cost per 1M tokens
| Input (per 1M tokens) | $2.00 |
|---|---|
| Output (per 1M tokens) | $10.00 |
| Output/input ratio | 5× |
| Blended (4:1 in:out) | $3.60 per 1M tokens |
What GPT-6.1 Sol costs per month
Real monthly spend at a 4:1 input-to-output mix — the ratio a typical chat or RAG workload actually produces.
| Workload | Tokens / month | Cost / month |
|---|---|---|
| Side project | 1M in / 0.25M out | $4.50 |
| Small team | 20M in / 5M out | $90 |
| Production | 200M in / 50M out | $900 |
Run your own numbers in the AI API cost calculator.
Cheaper alternatives to GPT-6.1 Sol
| Model | Blended $/1M | You save |
|---|---|---|
| Mistral 7B open | $0.0220 | 99% cheaper |
| Llama 3.1 8B open | $0.0220 | 99% cheaper |
| Mistral NeMo 12B open | $0.0240 | 99% cheaper |
Frequently asked questions
How much does GPT-6.1 Sol cost per 1M tokens?
GPT-6.1 Sol costs $2.00 per 1M input tokens and $10.00 per 1M output tokens. At a typical 4:1 input-to-output mix that blends to about $3.60 per 1M tokens.
How much does GPT-6.1 Sol cost per month?
A small-team workload of 20M input and 5M output tokens a month costs about $90 on GPT-6.1 Sol. A side project (1M in / 0.25M out) costs roughly $4.50.
What is a cheaper alternative to GPT-6.1 Sol?
Mistral 7B is the strongest cheaper option in our database at $0.0220 per 1M blended — about 99% less than GPT-6.1 Sol. It is also open-weight, so self-hosting is an option.
Can I run GPT-6.1 Sol locally?
No. GPT-6.1 Sol is a closed, API-only model — the weights are not released, so it cannot be self-hosted.
Why does GPT-6.1 Sol charge more for output than input?
Output tokens are generated one at a time and cannot be batched the way a prompt can, so they cost the provider more to serve. GPT-6.1 Sol charges 5× more for output, which is why prompt-heavy workloads are far cheaper to run than generation-heavy ones.
Prices are the published list rates for the model's primary API and are reviewed as providers change them. Volume, batch and cached-input discounts are not included. Compare every model side by side in the AI models database or the LLM leaderboard.