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 Kimi K3.1 Pro: price, context and capabilities
Choose GPT-6.1 Sol for reused prompts and documents (RAG, agents). Choose Kimi K3.1 Pro for the latest release.
In short
- Both cost the same at the headline price ($4.00 / 1M tokens).
- GPT-6.1 Sol reads more per request: 1.05M tokens against 1.05M.
- Kimi K3.1 Pro is the newer model (Oct 23, 2026, against Sep 29, 2026).
- Only GPT-6.1 Sol offers batch api.
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 Kimi K3.1 Pro.
Latest release
Choose Kimi K3.1 Pro
Kimi K3.1 Pro is the newer release (Oct 23, 2026, against Sep 29, 2026 for GPT-6.1 Sol).
Monthly cost at three volumes
| Volume | GPT-6.1 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-6.1 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 | $0.10 / 1M tokens | $0.20 / 1M tokens |
| Context window | 1.05M | 1.05M |
| Max output | 128k | 944k |
| Released | Sep 29, 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-6.1-sol | kimi-k3.1-pro |
Benchmarks side by side
Leader in bold.
| Benchmark | GPT-6.1 Sol | Kimi K3.1 Pro |
|---|---|---|
| Intelligence Index | 51.8 | No data |
| SciCode | 54.2% | No data |
| Humanity's Last Exam | 52.9% | No data |
| MMMU-Pro (visual reasoning) | 86% | No data |
| Long-context reasoning (AA-LCR) | 83% | 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-6.1 Sol or Kimi K3.1 Pro?
Choose GPT-6.1 Sol for reused prompts and documents (RAG, agents). Choose Kimi K3.1 Pro for the latest release.
Which is cheaper, GPT-6.1 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-6.1 Sol or Kimi K3.1 Pro?
GPT-6.1 Sol reads more per request: 1.05M tokens against 1.05M.
What is the difference between GPT-6.1 Sol and Kimi K3.1 Pro?
GPT-6.1 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-6.1 Sol reads more per request: 1.05M tokens against 1.05M. Kimi K3.1 Pro is the newer model (Oct 23, 2026, against Sep 29, 2026). Only GPT-6.1 Sol offers batch api.
How much do GPT-6.1 Sol and Kimi K3.1 Pro cost per month?
At 20 million input and 5 million output tokens a month, GPT-6.1 Sol costs $90.00 and Kimi K3.1 Pro costs $90.00, at standard rates.
Which is newer, GPT-6.1 Sol or Kimi K3.1 Pro?
Kimi K3.1 Pro was released on Oct 23, 2026 and GPT-6.1 Sol on Sep 29, 2026.