Moonshot AI · open weights on Arena · first on Arena 26 July 2026

kimi-k3-max

1 day in first place

It held first place on Arena in WebDev (1 day).

Embed

Who held first place

<iframe src="https://jesseahawkins.com/frontier/embed/" title="Frontier: who held first place on each Arena leaderboard, and for how long" width="100%" height="560" style="border:0;max-width:100%" loading="lazy"></iframe>

Credits LMArena.

The open-weights catch-up

<iframe src="https://jesseahawkins.com/frontier/embed/catch-up/" title="Frontier: the days until open weights matched each closed leader" width="100%" height="900" style="border:0;max-width:100%" loading="lazy"></iframe>

Credits LMArena.

The saturation clock

<iframe src="https://jesseahawkins.com/frontier/embed/clock/" title="Frontier: the days from each benchmark’s release to a model at 90%" width="100%" height="640" style="border:0;max-width:100%" loading="lazy"></iframe>

Credits Epoch AI.

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Cite

This page

Jesse Hawkins, “kimi-k3-max · Frontier”, jesseahawkins.com, data retrieved 30 Oct 2026. https://jesseahawkins.com/frontier/kimi-k3-max/. Data: LMArena, Arena leaderboard dataset, revision 4491b06, CC BY 4.0; Epoch AI, Capabilities & benchmarking, CC BY 4.0.

BibTeX

@misc{hawkins2026frontierkimik3max,
  author = {Hawkins, Jesse},
  title = {{kimi-k3-max · Frontier}},
  year = {2026},
  howpublished = {\url{https://jesseahawkins.com/frontier/kimi-k3-max/}},
  note = {Data: LMArena, Arena leaderboard dataset, revision 4491b06, CC BY 4.0; Epoch AI, Capabilities \& benchmarking, CC BY 4.0, retrieved 2026-10-30}
}

Arena · LMArena

LMArena, "Arena leaderboard dataset", Hugging Face, revision 4491b06. https://huggingface.co/datasets/lmarena-ai/leaderboard-dataset. CC BY 4.0.

Benchmarks · Epoch AI

Epoch AI, 'Capabilities & benchmarking'. Published online at epoch.ai. Retrieved from 'https://epoch.ai/benchmarks' [online resource]. CC BY 4.0.

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Post on X

Text: best place 14

place 25 of 419 on 28 October 2026

1st10th

On the board: 26 July 2026 to 28 October 2026, the newest snapshot
Score: 1476 (1471–1480) on 28 October 2026 · 36,780 votes

WebDev: 1 day in first place

place 18 of 152 on 28 October 2026

1st10th

On the board: 26 July 2026 to 28 October 2026, the newest snapshot
Score: 1656 (1651–1662) on 28 October 2026 · 21,281 votes
First place: 26 July 2026 to 27 July 2026 · 1 day
Matched: claude-fable-5 on 26 July 2026, 46 days after it took first place
gpt-5.6-sol-xhigh (codex-harness) on 26 July 2026, 14 days after it took first place

Epoch AI: Kimi K3

released 16 July 2026 · Open weights (non-commercial)

Chess Puzzles 37.0%
FrontierMath-Tier-4-v2-Private 39.0%
FrontierMath-Tiers-1-3-v2-Private 72.2%
Furniture Assembly 34.2%
GPQA diamond 93.1%
Mystery Game Puzzles 26.0%
OTIS Mock AIME 2024-2025 97.2%
SimpleQA Verified 50.6%

Sources

Arena scores come from people voting between two anonymous answers. First place is the highest score; the top two are often within each other’s margin of error. LMArena, Arena leaderboard dataset, revision 4491b06, retrieved 30 October 2026; Epoch AI, Capabilities & benchmarking, retrieved 30 October 2026. Both CC BY 4.0.