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Moonshot AI

Kimi K3.1 Pro

Benchmarks, price, context and versions

Also searched as

Kimi AI

Direct answer: Kimi K3.1 Pro is a model from Moonshot AI. 94.2% on GPQA Diamond, per Epoch AI. On OpenRouter, US$ 2.00 per 1 million input tokens and US$ 10.00 per 1 million output tokens.

✓ Good for

  • technical reasoning on science topics (#11 of 198 on GPQA Diamond)
  • calculation and problems with an exact answer (#8 of 186 on OTIS Mock AIME)
  • the ceiling of reasoning on research-level math (#22 of 86 on FrontierMath (tiers 1 to 3))
  • answering short facts with little invention (#16 of 87 on SimpleQA Verified)
  • technical reasoning as the model appears through the API (#11 of 135 on GPQA Diamond (OpenRouter))
  • agents that follow rules and use tools (#13 of 131 on τ-bench Verified (airline))
  • very long documents or code (a window of 1 million tokens or more, according to OpenRouter)
  • running on your own infrastructure (open weights)

✕ Not the best for

  • when the input budget sits at the top of the table (input price in the highest 25% on OpenRouter)

This block follows a rule of this section, using source data: if the model is in the top 25% of the metric, the item goes under "Good for"; if it is in the bottom half, it goes under "Not the best for". The middle band appears in neither. Price and context use OpenRouter; scores use Epoch AI or OpenRouter Benchmarks, in the latest version we checked.

Benchmarks

GPQA Diamond

?what it is
94.2%

highest score on this metric 96.4%

11º / 198 · Epoch AI, latest version we checked

OTIS Mock AIME

?
100%

8º / 186 · Epoch AI, latest version we checked

FrontierMath (tiers 1 to 3)

?
78.2%

highest score on this metric 95.1%

22º / 86 · Epoch AI, latest version we checked

SimpleQA Verified

?
62.2%

highest score on this metric 94%

16º / 87 · Epoch AI, latest version we checked

GPQA Diamond (OpenRouter)

?
93.9%

highest score on this metric 96.5%

11º / 135 · OpenRouter Benchmarks, latest version we checked

τ-bench Verified (airline)

?
78.7%

highest score on this metric 82%

13º / 131 · OpenRouter Benchmarks, latest version we checked

Key specs

Origin
China
Family
Kimi K3 provisional data
Weights?
open
License
no data
Input US$/1M?
US$ 2.00
Output US$/1M
US$ 10.00
Context?
1,048,576 tokens
Parameters
no data
Input
image, text, video
OpenRouter usage?
2.51%
Downloads (30 days)?
no data
Use cases provisional data
Text Agents
Dates in sources
  • 2026, published, per Epoch AI
  • 2026, listed on OpenRouter

Version history

Dates come from the sources: OpenRouter listing or Hugging Face repo creation, which may differ from the official launch.

FAQ

What is Kimi K3.1 Pro?

Kimi K3.1 Pro is a model from Moonshot AI, with open weights, used for text, agents.

How much does Kimi K3.1 Pro cost?

On OpenRouter, US$ 2.00 per 1 million input tokens and US$ 10.00 per 1 million output tokens.

What is the context window of Kimi K3.1 Pro?

1,048,576 tokens, per OpenRouter.

Is Kimi K3.1 Pro open source?

Yes, it has open weights. License: no data.

What is Kimi K3.1 Pro's GPQA Diamond score?

94.2% on GPQA Diamond, per Epoch AI.

Is Kimi K3.1 Pro good for coding?

No data: there is no SWE-bench Verified measurement for it in open sources.

Who made Kimi K3.1 Pro?

It was made by Moonshot AI, a lab from China.

provisional data Questions ordered by what shows up in public Google search suggestions (no volume). Answers use source data only.

Compare with

Models from Moonshot AI

See lab

Sources

  • Epoch AI, CC BY 4.0, latest version we checked.
  • OpenRouter, dados públicos da API; exports de benchmarks e rankings em CC BY 4.0, latest version we checked.
  • OpenRouter Benchmarks, CC BY 4.0, latest version we checked.

Dates come from the sources: OpenRouter listing or Hugging Face repo creation, which may differ from the official launch. Family and version were grouped by rule from the name.