High-volume, cost-sensitive work
Either one
Both cost $4.00 per million tokens on a typical mix of three input tokens for every output token.
GPT-6.1 Sol vs GPT-6 Sol: price, context and capabilities
Choose GPT-6.1 Sol for reused prompts and documents (RAG, agents), the hardest reasoning tasks and the latest release; on the other points the two are level or the data is missing.
In short
- Both cost the same at the headline price ($4.00 / 1M tokens).
- Both accept 1.05M tokens per request.
Which should you choose?
Each answer below comes straight from the published prices, specifications and independent benchmark results.
Reused prompts and documents (RAG, agents)
Choose GPT-6.1 Sol
GPT-6.1 Sol charges $0.10 per million cached input tokens, against $0.20 for GPT-6 Sol.
Hardest reasoning tasks
Choose GPT-6.1 Sol
GPT-6.1 Sol scores 51.8 on the Artificial Analysis Intelligence Index, against 47.6 for GPT-6 Sol.
Reasoning over long documents
Either one
They are practically level on Long-context reasoning (AA-LCR) (83% and 83.7%).
Latest release
Choose GPT-6.1 Sol
GPT-6.1 Sol is the newer release (Sep 29, 2026, against Sep 22, 2026 for GPT-6 Sol).
Monthly cost at three volumes
| Volume | GPT-6.1 Sol | GPT-6 Sol | Difference |
|---|---|---|---|
| Prototype: 1M input, 250K output tokens | $4.50 | $4.50 | = |
| Production: 20M input, 5M output tokens | $90.00 | $90.00 | = |
| Scale: 500M input, 100M output tokens | $2,000 | $2,000 | = |
Standard rates, without caching or batch discounts. Volumes are per month.
Specifications side by side
| GPT-6.1 Sol | GPT-6 Sol | |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Category | Language models | Language models |
| Status | Generally available | Generally available |
| Headline price | $4.00 / 1M tokens | $4.00 / 1M tokens |
| Input | $2.00 / 1M tokens | $2.00 / 1M tokens |
| Output | $10.00 / 1M tokens | $10.00 / 1M tokens |
| Cached input | $0.10 / 1M tokens | $0.20 / 1M tokens |
| Context window | 1.05M | 1.05M |
| Max output | 128k | 128k |
| Released | Sep 29, 2026 | Sep 22, 2026 |
| Knowledge cutoff | April 2026 | April 2026 |
| Licence | Proprietary | Proprietary |
| Capabilities | Vision, Reasoning, Tool calling, Structured output, Prompt caching, Batch API | Vision, Reasoning, Tool calling, Structured output, Prompt caching, Batch API |
| API model id | gpt-6.1-sol | gpt-6-sol |
Benchmarks side by side
Leader in bold.
| Benchmark | GPT-6.1 Sol | GPT-6 Sol |
|---|---|---|
| Intelligence Index | 51.8 | 47.6 |
| SciCode | 54.2% | 57.6% |
| Humanity's Last Exam | 52.9% | 47.9% |
| MMMU-Pro (visual reasoning) | 86% | 82.9% |
| Long-context reasoning (AA-LCR) | 83% | 83.7% |
Independent evaluations by Artificial Analysis, run the same way for every model, at the reasoning setting shown. Percentages unless marked as an index.
Frequently asked questions
Should I choose GPT-6.1 Sol or GPT-6 Sol?
Choose GPT-6.1 Sol for reused prompts and documents (RAG, agents), the hardest reasoning tasks and the latest release; on the other points the two are level or the data is missing.
Which is cheaper, GPT-6.1 Sol or GPT-6 Sol?
Both cost the same at the headline price ($4.00 / 1M tokens).
Which has the larger context window, GPT-6.1 Sol or GPT-6 Sol?
Both accept 1.05M tokens per request.
What is the difference between GPT-6.1 Sol and GPT-6 Sol?
GPT-6.1 Sol is made by OpenAI and GPT-6 Sol by OpenAI. Both cost the same at the headline price ($4.00 / 1M tokens). Both accept 1.05M tokens per request.
How much do GPT-6.1 Sol and GPT-6 Sol cost per month?
At 20 million input and 5 million output tokens a month, GPT-6.1 Sol costs $90.00 and GPT-6 Sol costs $90.00, at standard rates.
Which is newer, GPT-6.1 Sol or GPT-6 Sol?
GPT-6.1 Sol was released on Sep 29, 2026 and GPT-6 Sol on Sep 22, 2026.