By the toolist.ai editors. Researched from public sources, not hands-on tested by toolist.ai. Updated October 6, 2026; prices checked October 6, 2026.
GPT-6.1 Sol: price, context window and benchmarks
GPT-6.1 Sol is OpenAI's mid-tier GPT-6 model, at $2 per million input tokens and $10 per million output tokens, one fifth of GPT-6 Astra's price. OpenAI pitches it as close to Astra on coding and professional work, and Artificial Analysis puts it at 51.8 on its Intelligence Index against Astra's 52.7.
Best for
- Long-running coding and agent work where cost matters more than the last few points of quality
- Teams on GPT-6 Sol: same token prices, half the cached-input price and higher benchmark scores
- Workloads that reuse long prompts, since cached input costs $0.10 per million tokens
Key facts
| Fact | GPT-6.1 Sol | Source |
|---|---|---|
| Provider | OpenAI | OpenAI API docs: Pricing |
| API model name | gpt-6.1-sol | OpenAI API docs: GPT-6.1 Sol |
| Released | September 29, 2026 | OpenAI API docs: Changelog |
| Input price | $2 per million tokens | OpenAI API docs: Pricing |
| Cached input price | $0.10 per million tokens | OpenAI API docs: Pricing |
| Output price | $10 per million tokens | OpenAI API docs: Pricing |
| Context window | 1,050,000 tokens | OpenAI API docs: GPT-6.1 Sol |
| Maximum output | 128,000 tokens | OpenAI API docs: GPT-6.1 Sol |
| Knowledge cutoff | April 30, 2026 | OpenAI API docs: GPT-6.1 Sol |
| Input and output | Text and images in; text out | OpenAI API docs: GPT-6.1 Sol |
| Reasoning | Always reasons. Effort levels low to max; medium is the default | OpenAI API docs: Reasoning models |
| API and cloud platforms | OpenAI API (Responses, Chat Completions and Batch) | OpenAI API docs: GPT-6.1 Sol |
| In the apps | ChatGPT Plus, Pro, Business, Enterprise and Edu, in ChatGPT Work and Codex | ChatGPT docs: Models |
Prompts over 272,000 input tokens are billed at twice the input rate and 1.5 times the output rate for the whole request. Batch and Flex processing cost half; Fast mode costs double.
What GPT-6.1 Sol costs a month
Three typical workloads, priced at the standard API rates above. We calculated these; the provider does not publish them.
| Workload | Tokens a month | Cost a month |
|---|---|---|
| Support chatbot 100,000 replies, each 3,000 input and 400 output tokens, no caching | 300M in, 40M out | $1,000 |
| Document Q&A 5,000 questions over the same 60,000-token document set (90% cache hits), 800 output tokens each | 300M in, 4M out | $127 |
| Coding agent 200 tasks, each 1.5 million input tokens (90% cache hits) and 50,000 output tokens | 300M in, 10M out | $187 |
Reasoning models bill their thinking as output tokens, so heavy reasoning can raise the output count several times. Cache-write charges are not included.
Benchmarks
| Benchmark | Score | Source |
|---|---|---|
| Artificial Analysis Intelligence Index max effort | 51.8 | Artificial Analysis: GPT-6.1 Sol (max) |
| Intelligence Index at everyday effort medium effort, the API default | 47.8 | Artificial Analysis: GPT-6.1 Sol (medium) |
| Coding Agent Index Codex harness, max effort | 60.1 | Artificial Analysis: Coding agents |
| Terminal-Bench 4.0 max effort | 56.1% | Artificial Analysis: GPT-6.1 Sol vs GPT-6 Astra |
| Humanity's Last Exam max effort | 52.9% | Artificial Analysis: GPT-6.1 Sol vs GPT-6 Astra |
| GDPval-AA v2.1 (Elo) max effort | 1575 | Artificial Analysis: GPT-6.1 Sol vs GPT-6 Astra |
| SciCode max effort | 54.2% | Artificial Analysis: GPT-6.1 Sol vs GPT-6 Astra |
| Terminal-Bench-Science 0.1 max effort | 58.1% | Artificial Analysis: GPT-6.1 Sol (max) |
Speed: about 48.8 output tokens a second, 6.2 seconds to the first token (medium effort, OpenAI API; Artificial Analysis: GPT-6.1 Sol (medium)).
Benchmark and speed data marked as such come from Artificial Analysis.
What changed
Compared with GPT-6 Sol, released a week earlier, input and output prices stay at $2 and $10 per million tokens, cached input drops from $0.20 to $0.10, the knowledge cutoff moves from April 20 to April 30, 2026, and the "none" reasoning effort is gone. Artificial Analysis measures a higher Intelligence Index (51.8 against 47.6) but slower output (59 against 100 tokens a second at max effort). (OpenAI API docs: GPT-6.1 Sol vs GPT-6 Sol)
GPT-6.1 Sol compared
Other models
- Claude Opus 5.5: $4 in, $20 out per million tokens
- GPT-6 Sol: $2 in, $10 out per million tokens
- GPT-6 Astra: $10 in, $50 out per million tokens
- Claude Fable 5.1: $10 in, $50 out per million tokens
- Claude Opus 5: $5 in, $25 out per million tokens
All prices side by side: AI model API price table. How we research: our method.
Sources
- OpenAI API docs: GPT-6.1 Sol (checked 2026-10-06)
- OpenAI API docs: Pricing (checked 2026-10-06)
- OpenAI API docs: Changelog (checked 2026-10-06)
- OpenAI API docs: Reasoning models (checked 2026-10-06)
- OpenAI API docs: GPT-6.1 Sol vs GPT-6 Sol (checked 2026-10-06)
- ChatGPT docs: Models (checked 2026-10-06)
- Artificial Analysis: GPT-6.1 Sol (max) (checked 2026-10-06)
- Artificial Analysis: GPT-6.1 Sol (medium) (checked 2026-10-06)
- Artificial Analysis: GPT-6.1 Sol vs GPT-6 Astra (checked 2026-10-06)
- Artificial Analysis: Coding agents (checked 2026-10-06)
- OpenRouter: GPT-6.1 Sol (checked 2026-10-06)