OpenAI · Released Sep 29, 2026GPT-6.1 Sol
Near-Astra performance for complex coding, computer use, and professional work at a lower cost.
- Capability
- —No ECI score yet
- Input
- $2.00per 1M tokens
- Output
- $10.00per 1M tokens
- Context
- 1.05M128K max output
What it costs
- Input
- $2.00per million tokens
- Output
- $10.00per million tokens
- Cached input
- $0.10per million tokens
- Cache write
- $2.50per million tokens
- Over 272K tokens
- $4.00 / $15.00input / output per million
- Blended (3:1)
- $4.00pricier than 83% of priced models
Typical monthly bills
| Monthly usage | Estimated cost |
|---|---|
| Side project2M input + 0.5M output tokens | $9.00 |
| Team assistant25M input + 5M output tokens | $100.00 |
| Production app250M input + 50M output tokens | $1,000 |
Official OpenAI API price, as listed on models.dev.
Independent benchmarks
Epoch AI has not published a Capabilities Index score for GPT-6.1 Sol yet.
Scores from Epoch AI, run independently of OpenAI.
The details
- Lab
- OpenAI
- Released
- Sep 29, 2026
- Knowledge cutoff
- Apr 30, 2026
- Context window
- 1,050,000 tokens
- Max output
- 128,000 tokens
- Inputs
- Text, Images, PDFs
- Output
- Text
- Reasoning
- Adjustable effort low · medium · high · xhigh · max
- Tool calling
- Yes
- Structured output
- Yes
- Weights
- Proprietary
- API model ID
gpt-6.1-solon OpenAI- Availability
- 21 API providerslisted on models.dev
More from OpenAI
About GPT-6.1 Sol
How much does GPT-6.1 Sol cost?
GPT-6.1 Sol costs $2.00 input / $10.00 output per million tokens (official OpenAI API price). Cached input is $0.10 per million tokens, and writing to the cache costs $2.50. Requests over 272K tokens are billed at $4.00 input / $15.00 output. At a 3:1 input-to-output mix that is $4.00 per million tokens, more expensive than 83% of the 360 priced models we track.
What is the context window of GPT-6.1 Sol?
GPT-6.1 Sol accepts up to 1,050,000 tokens per request and can write up to 128,000 tokens in one response.
How good is GPT-6.1 Sol?
Epoch AI has not published a Capabilities Index score for GPT-6.1 Sol yet. Epoch AI benchmark results: GPQA Diamond 95.4%, FrontierMath Tiers 1–3 93.7%, OTIS Mock AIME 2024–2025 100%, SimpleQA Verified 73.9%.
Is GPT-6.1 Sol open source?
No. GPT-6.1 Sol is proprietary; you use it through OpenAI’s API or partner platforms.
What inputs does GPT-6.1 Sol support?
GPT-6.1 Sol accepts text, images and PDFs and replies in text. It is a reasoning model with low, medium, high, xhigh and max effort settings, supports tool calling and can return structured JSON output.
When was GPT-6.1 Sol released?
OpenAI released GPT-6.1 Sol on Sep 29, 2026. Its training data runs to Apr 30, 2026.
What are the best alternatives to GPT-6.1 Sol?
The closest current models from other labs on capability, price and release date are Claude Sonnet 5.5 (Anthropic, ECI 165.2, $2.00 / $10.00), Grok 4.6 (xAI, ECI 156.6, $2.00 / $6.00), Gemini 3.8 Flash (Google, ECI 156.9, $0.75 / $3.75) and Qwen3.8 Max (Alibaba (Qwen), ECI 156.6, $2.00 / $6.00).