NOUMENOpen app
NOUMEN

Moonshot · Open weights

Kimi K2 0711 Fast

Added Dec 15, 2025Open weights

Compare models

Choose up to 3 models to compare.1 of 3 chosen

Loading models…

Use in the app

Deprecated. This model now routes to Kimi K2 0711.

  • PDF input
Input
Text
Output
Text
Discovery tier
Open weights

Pricing

USD per 1M tokens
Input
$0.40
Output
$1.80

Reference prices as published by the model provider. API example

Specifications

Context window
131.1K
Max output
16.4K

Side by side

Kimi K2 0711 Fast compared

Specifications, prices, speed and benchmark scores next to each other. Benchmarks below show every compared model too.

Compare models

Choose up to 3 models to compare.1 of 3 chosen

Loading models…

Kimi K2 0711 FastMoonshotThis modelGPT 4.1OpenAIRemove
ProviderMoonshotOpenAI
Discovery tierOpen weightsFrontier
AddedDec 15, 2025Sep 10, 2025
Limits
Context window131.07K1.05MBest
Max output16.38K32.77KBest
Average output—29 tokens
Pricing, USD per 1M tokens
Input$0.40Best$2.00
Output$1.80Best$8.00
Cache read—$0.50
Performance
Request success (24h)—100.0%
Benchmark indexes
Intelligence Index12.712.7
Math Index57.0Best34.7
Capabilities
ToolsNoYes
VisionNoYes
Structured outputNoYes
PDF inputYesYes
Reasoning effort——

Public evaluations

Benchmarks

Independent evaluation results, with how each score ranks among the models in the Noumen catalog.

  • Kimi K2 0711 Fast
  • GPT 4.1

Intelligence Index

  • Kimi K2 0711 Fast12.7
  • GPT 4.112.7

Kimi K2 0711 Fast: Better than 28% of 326 scored models

3.8Catalog models by score55.1

Indexes

  • Math Index

    Composite of the math evaluations

    • Kimi K2 0711 Fast: 57.0Top
    • GPT 4.1: 34.7

Document reasoning

  • AA-LCRv1.1

    Reasoning across long documents

    • Kimi K2 0711 Fast: 53.0%
    • GPT 4.1: 68.3%Top

Reasoning and knowledge

  • Humanity’s Last Exam

    Expert-level questions across academic fields

    • Kimi K2 0711 Fast: 7.4%Top
    • GPT 4.1: 4.2%

  • GPQA Diamond

    Graduate-level science questions

    • Kimi K2 0711 Fast: 76.6%Top
    • GPT 4.1: 66.6%

  • MMLU-Pro

    Multi-subject knowledge and reasoning

    • Kimi K2 0711 Fast: 82.4%Top
    • GPT 4.1: 80.6%

  • IFBench

    Following precise output instructions

    • Kimi K2 0711 Fast: 41.5%
    • GPT 4.1: 43.0%Top

Coding

  • LiveCodeBench

    Recent competitive programming problems

    • Kimi K2 0711 Fast: 55.6%Top
    • GPT 4.1: 45.7%

Math

  • AIME 2025

    Competition mathematics, 2025 problems

    • Kimi K2 0711 Fast: 57.0%Top
    • GPT 4.1: 34.7%

  • AIME

    Competition mathematics

    • Kimi K2 0711 Fast: 69.3%Top
    • GPT 4.1: 43.7%

  • MATH-500

    Competition math problems

    • Kimi K2 0711 Fast: 97.1%Top
    • GPT 4.1: 91.3%

Legacy evaluations

  • Terminal-Bench Hard

    Earlier terminal task suite

    • Kimi K2 0711 Fast: 15.9%Top
    • GPT 4.1: 13.6%

  • τ²-Bench Telecom

    Tool use in a customer-support simulation

    • Kimi K2 0711 Fast: 61.1%Top
    • GPT 4.1: 47.1%

  • AA-LCR (unversioned)

    Long-context reasoning, earlier grading

    • Kimi K2 0711 Fast: 53.0%
    • GPT 4.1: 68.3%Top

Scores from Artificial Analysis, updated Oct 26, 2026. Artificial Analysis

Developers

Use it through the API

Noumen’s API is OpenAI-compatible: any Chat Completions client works with a base URL and a key.

Read the quickstart
curl https://www.noumen.xyz/api/v1/chat/completions \
  -H "Authorization: Bearer $NOUMEN_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "kimi-k2-instruct-fast",
    "messages": [{ "role": "user", "content": "Explain this stack trace." }]
  }'
import os
from openai import OpenAI

client = OpenAI(base_url="https://www.noumen.xyz/api/v1", api_key=os.environ["NOUMEN_API_KEY"])
reply = client.chat.completions.create(
    model="kimi-k2-instruct-fast",
    messages=[{"role": "user", "content": "Explain this stack trace."}],
)
print(reply.choices[0].message.content)

Moonshot

Other Moonshot models, starting with the same family.