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Step 5 Preview
Kimi K3.1 Pro
Kimi K3.1 Pro is a proprietary model from Moonshot AI, released Oct 23, 2026. It ranks #8 of 27 on the Vals Index with 62.52%. It costs $2 per million input tokens and $10 per million output tokens, with a 1M-token context window.
- Developer
- Moonshot AI
- Released
- Oct 23, 2026
- Context window
- 1M
- Price in / out, per 1M tokens
- $2 / $10
- Weights
- Proprietary
- Inputs
- Text, Images, Video
- Reasoning
- Yes
- Tool use
- Yes
Benchmarks
| Benchmark | Score bar | Accuracy | Rank | Cost / test |
|---|---|---|---|---|
| Vals IndexVals AI | 62.52% | 8 / 27 | $6.44 | |
| Terminal-Bench 4.0Coding | 63.64% | 3 / 55 | $4.57 | |
| Vibe Code BenchCoding | 84.89% | 17 / 115 | $7.49 | |
| Finance AgentFinance | 61.49% | 15 / 31 | $2.29 | |
| Finance IndexFinance | 56.01% | 18 / 31 | $2.51 | |
| Tax Agent BenchFinance | 24.87% | 40 / 76 | $3.64 | |
| Legal IndexLaw | 67.04% | 22 / 28 | $6.63 | |
| Legal Research BenchLaw | 37.50% | 42 / 85 | $7.23 |
Vals AI, as of Oct 24, 2026.
LMArena, by category
| Leaderboard | Rating | Rank | Votes |
|---|---|---|---|
| WebDevLMArena | 1692 | 8 / 124 | 2.5K |
LMArena, CC BY 4.0, as of Oct 22, 2026. Where a model is rated at several effort levels, its best is shown.
Compare Kimi K3.1 Pro
Moonshot AI
The lab behind Kimi, known for long-context and agentic open-weight models. Founded 2023, based in Beijing. moonshot.ai
Questions
Who makes Kimi K3.1 Pro?
Kimi K3.1 Pro is made by Moonshot AI, founded 2023 and based in Beijing.
How much does Kimi K3.1 Pro cost?
$2 per million input tokens and $10 per million output tokens, at its provider’s list price.
What is Kimi K3.1 Pro’s context window?
1M tokens (1,048,576).
Is Kimi K3.1 Pro open source?
No. Kimi K3.1 Pro is proprietary and served through its provider’s API.