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Kimi K3 vs x-AI/Grok-Code-Fast 1

Compare canonical objects directly. The useful dimensions change with the object type, so model and hardware comparisons stay separate.

ModelsHardware
Kimi K3

Moonshot AI

Sources:models.devOpenRouter

x-AI/Grok-Code-Fast 1

xAI

Sources:models.dev

Benchmark results

Head to head on 1 benchmark both models report

  • Kimi K31lead
  • x-AI/Grok-Code-Fast 10leads

  • DeepSWE 1.1

    Best pass@1 · Higher is better

    • Kimi K3
      68.5%
      #8 of 28
    • x-AI/Grok-Code-Fast 1
      Not reported
    Runs and sources
    Kimi K3
    • max68.5%mini-swe-agent · pass@4 89.4% · $4.65 / attempt
    x-AI/Grok-Code-Fast 1

    Not reported

    Source:DeepSWE leaderboard, 2026-09-22Official source JSON

  • Arena Text

    Arena rating · Higher is better

    • Kimi K3
      1487
      Arena #19CI 1483 to 1491
    • x-AI/Grok-Code-Fast 1
      Not reported
    Runs and sources
    Kimi K3
    • max148795% CI 1483 to 1491 · 40,867 votes
    x-AI/Grok-Code-Fast 1

    Not reported

    Source:Arena Text leaderboard, 2026-11-09

  • Arena WebDev

    Arena rating · Higher is better

    • Kimi K3
      Best1658
      +494 ahead · Arena #18CI 1652 to 1664
    • x-AI/Grok-Code-Fast 1
      1164
      Arena #154CI 1135 to 1193
    Runs and sources
    Kimi K3
    • max165895% CI 1652 to 1664 · 22,405 votes
    x-AI/Grok-Code-Fast 1
    • default116495% CI 1135 to 1193 · 770 votes
    Source:Arena WebDev leaderboard, 2026-11-10

  • Agent Arena

    IPS score · Higher is better

    • Kimi K3
      +0.006
      Arena #28CI -0.001 to +0.012
    • x-AI/Grok-Code-Fast 1
      Not reported
    Runs and sources
    Kimi K3
    • max+0.00695% CI -0.001 to +0.012 · 16,124,377 observations
    x-AI/Grok-Code-Fast 1

    Not reported

    Source:Agent Arena leaderboard, 2026-11-11

  • ARC-AGI-2

    Best published score · Higher is better

    • Kimi K3
      60.4%
      #36 of 85
    • x-AI/Grok-Code-Fast 1
      Not reported
    Runs and sources
    Kimi K3
    • low12.4%
    • high55.0%
    • max60.4%
    x-AI/Grok-Code-Fast 1

    Not reported

    Source:External evaluation via Epoch AIOriginal-source terms apply

  • FrontierMath-Tier-4-v2-Private

    Best published score · Higher is better

    • Kimi K3
      39.0%
      #28 of 72
    • x-AI/Grok-Code-Fast 1
      Not reported
    Runs and sources
    Kimi K3
    • max39.0%
    x-AI/Grok-Code-Fast 1

    Not reported

    Source:Epoch AI evaluation

  • FrontierMath-Tiers-1-3-v2-Private

    Best published score · Higher is better

    • Kimi K3
      72.2%
      #26 of 87
    • x-AI/Grok-Code-Fast 1
      Not reported
    Runs and sources
    Kimi K3
    • max72.2%
    x-AI/Grok-Code-Fast 1

    Not reported

    Source:Epoch AI evaluation

  • GPQA diamond

    Best published score · Higher is better

    • Kimi K3
      93.1%
      #21 of 161
    • x-AI/Grok-Code-Fast 1
      Not reported
    Runs and sources
    Kimi K3
    • low84.8%
    • high91.9%
    • max93.1%
    x-AI/Grok-Code-Fast 1

    Not reported

    Source:Epoch AI evaluation

  • OTIS Mock AIME 2024-2025

    Best published score · Higher is better

    • Kimi K3
      97.2%
      #32 of 158
    • x-AI/Grok-Code-Fast 1
      Not reported
    Runs and sources
    Kimi K3
    • low68.9%
    • high93.3%
    • max97.2%
    x-AI/Grok-Code-Fast 1

    Not reported

    Source:Epoch AI evaluation

  • SimpleQA Verified

    Best published score · Higher is better

    • Kimi K3
      50.6%
      #29 of 87
    • x-AI/Grok-Code-Fast 1
      Not reported
    Runs and sources
    Kimi K3
    • max50.6%
    x-AI/Grok-Code-Fast 1

    Not reported

    Source:Epoch AI evaluation

  • Terminal Bench

    Best published score · Higher is better

    • Kimi K3
      Not reported
    • x-AI/Grok-Code-Fast 1
      25.8%
      #42 of 49
    Runs and sources
    Kimi K3

    Not reported

    x-AI/Grok-Code-Fast 1
    • default25.8%Mini-SWE-Agent
    • default25.8%Mini-SWE-Agent
    • default14.2%Terminus 2
    • default14.2%Terminus 2
    Sources:Terminal-Bench v2 LeaderboardOriginal-source terms applyhttps://www.tbench.ai/leaderboard/terminal-bench/2.0Original-source terms apply

Each model's best published result is shown; "Not reported" means no matched evaluation, not a score of zero. Arena and DeepSWE ranks are the leaderboards' own; other ranks are among catalogue models with a score. Results from different harnesses or settings are not directly comparable.

Original-source terms apply to evaluations credited to their original publishers.

DeepSWE 1.1 results: official leaderboard, data generated 2026-09-22. Only exact model versions in the official dataset are matched.

Benchmark compilation: Epoch AI, Capabilities & benchmarking (CC BY attribution). Scores are converted to percentages and model names matched to the Vertical Tabs catalog. Individual evaluations are credited to their original sources. External results may carry separate licences and evaluation configurations; do not interpret scores from different harnesses as directly comparable.

Arena ratings: Arena (lmarena-ai/leaderboard-dataset), licensed CC BY 4.0. Ratings come from pairwise human votes and are only comparable within one leaderboard; the interval is Arena's 95% confidence interval. Model names are matched to the Vertical Tabs catalog.

Model specifications

Release date
July 16, 2026
September 2, 2025
Context window
1M
256K
Native context
1M
—
Max output tokens
943,718
10,000
Knowledge cutoff
—
—
Open weights
Open weights
Closed
Parameter count
2.8T
—

API pricing · USD per 1M tokens

Input
$0.192
—
Output
$16.00
—
Cached input
$0.182
—
Cache write
—
—

Capabilities and modalities

Input modalities
text, image, video
text
Output modalities
text
text
Tool calling
Supported
Supported
Reasoning option
Supported
Supported
Supported options
frequency_penalty, include_reasoning, logit_bias, logprobs, max_tokens, min_p, presence_penalty, reasoning, reasoning_effort, repetition_penalty, response_format, seed, stop, structured_outputs, temperature, tool_choice, tools, top_k, top_logprobs, top_p
tools, reasoning, temperature
Capabilities
vision, thinking, completion, tools
—

Architecture and availability

Architecture
kimi-k3
—
Model families
kimi-k3
—
Tokenizer
Other
—
Instruction format
—
—
License
—
—
Providers
18
0
Provider endpoints
54
0
Ollama variants
1
0
Metadata source
ai-research
models.dev

A dash means the field is not reported. Provider-specific performance and pricing may differ.

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