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 Sol vs Kimi K3.1 Pro: price, context and capabilities
Choose Kimi K3.1 Pro for 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).
- GPT-6 Sol reads more per request: 1.05M tokens against 1.05M.
- Kimi K3.1 Pro is the newer model (Oct 23, 2026, against Sep 22, 2026).
- Only GPT-6 Sol offers batch api.
Which should you choose?
Each answer below comes straight from the published prices, specifications and independent benchmark results.
Latest release
Choose Kimi K3.1 Pro
Kimi K3.1 Pro is the newer release (Oct 23, 2026, against Sep 22, 2026 for GPT-6 Sol).
Monthly cost at three volumes
| Volume | GPT-6 Sol | Kimi K3.1 Pro | 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 Sol | Kimi K3.1 Pro | |
|---|---|---|
| Provider | OpenAI | Moonshot AI |
| 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 | $0.20 / 1M tokens | $0.20 / 1M tokens |
| Context window | 1.05M | 1.05M |
| Max output | 128k | 944k |
| Released | Sep 22, 2026 | Oct 23, 2026 |
| Knowledge cutoff | April 2026 | No data |
| Licence | Proprietary | Proprietary |
| Capabilities | Vision, Reasoning, Tool calling, Structured output, Prompt caching, Batch API | Vision, Reasoning, Tool calling, Structured output, Prompt caching |
| API model id | gpt-6-sol | kimi-k3.1-pro |
Benchmarks side by side
Leader in bold.
| Benchmark | GPT-6 Sol | Kimi K3.1 Pro |
|---|---|---|
| Intelligence Index | 47.6 | No data |
| SciCode | 57.6% | No data |
| Humanity's Last Exam | 47.9% | No data |
| MMMU-Pro (visual reasoning) | 82.9% | No data |
| Long-context reasoning (AA-LCR) | 83.7% | No data |
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 Sol or Kimi K3.1 Pro?
Choose Kimi K3.1 Pro for the latest release; on the other points the two are level or the data is missing.
Which is cheaper, GPT-6 Sol or Kimi K3.1 Pro?
Both cost the same at the headline price ($4.00 / 1M tokens).
Which has the larger context window, GPT-6 Sol or Kimi K3.1 Pro?
GPT-6 Sol reads more per request: 1.05M tokens against 1.05M.
What is the difference between GPT-6 Sol and Kimi K3.1 Pro?
GPT-6 Sol is made by OpenAI and Kimi K3.1 Pro by Moonshot AI. Both cost the same at the headline price ($4.00 / 1M tokens). GPT-6 Sol reads more per request: 1.05M tokens against 1.05M. Kimi K3.1 Pro is the newer model (Oct 23, 2026, against Sep 22, 2026). Only GPT-6 Sol offers batch api.
How much do GPT-6 Sol and Kimi K3.1 Pro cost per month?
At 20 million input and 5 million output tokens a month, GPT-6 Sol costs $90.00 and Kimi K3.1 Pro costs $90.00, at standard rates.
Which is newer, GPT-6 Sol or Kimi K3.1 Pro?
Kimi K3.1 Pro was released on Oct 23, 2026 and GPT-6 Sol on Sep 22, 2026.