Noometry

Model comparison

Claude Mythos Preview vs Kimi K3

Kimi K3 has enough public results to be ranked (#15); Claude Mythos Preview does not yet, so treat this comparison as directional.

Last verified . 0 shared benchmarks.

Claude Mythos Preview Anthropic

41.2

Unranked Sparse

Kimi K3 Moonshot AI

59.5

Rank #15 Confirmed

Summary

  • Kimi K3 has downloadable open weights; the other is API-only.

Side by side

Claude Mythos PreviewKimi K3
ProviderAnthropicMoonshot AI
Noometry Index41.259.5
Released2026-04-072026-07-16
WeightsProprietaryOpen
Context window—1.05M
Max output—1.05M
Input $ / M tokens—$3
Output $ / M tokens—$15
Results tracked253

Sponsored placements are available on pages like this one. Advertise on Noometry

Category by category

Coding Not comparable

Claude Mythos Preview: —, Kimi K3: 61.0 (#10)

BenchmarkClaude Mythos PreviewKimi K3
DeepSWE—68.5%
FrontierCode—44.2%
LMArena WebDev—1654
FrontierSWE—25.9%
SciCode—59.5%
WeirdML—82.6%
LMArena Coding—1508
ALE-Bench—1,524

Agentic & Tool Use Too close to call

Claude Mythos Preview: 41.4, Kimi K3: 41.8 (#20)

BenchmarkClaude Mythos PreviewKimi K3
APEX-Agents—50.6%
τ²-bench Banking—37.1%
PostTrainBench—32%
ExploitBench73.8%—
GBAEval—48.3%
GDP.pdf—19%
METR Time Horizons85.2%—
Vending-Bench 2—5,165

Reasoning Not comparable

Claude Mythos Preview: —, Kimi K3: 63.0 (#17)

BenchmarkClaude Mythos PreviewKimi K3
ARC-AGI-2—60.4%
SimpleBench—60.7%
NYT Connections (extended)—93.6%
ARC-AGI-1—94.5%
CritPt—23.4%
Chess Puzzles—39%
LMArena Hard Prompts—1496
Mystery Game Puzzles—26%
DTBench—91.2%
LMCA—52.7%
Surface Evolver Bench—95%
Epoch Capabilities Index—157.45
ForecastBench—61.1

Math Not comparable

Claude Mythos Preview: —, Kimi K3: 74.2 (#16)

BenchmarkClaude Mythos PreviewKimi K3
FrontierMath (Tiers 1-3)—72.2%
FrontierMath Tier 4—39%
MathArena Final-Answer Competitions—87.8%
OTIS Mock AIME 2024-2025—97.2%
ProofBench—87%
LMArena Math—1491

Knowledge Not comparable

Claude Mythos Preview: —, Kimi K3: 63.2 (#21)

BenchmarkClaude Mythos PreviewKimi K3
GPQA Diamond—93.1%
SimpleQA Verified—50.6%
LMArena Expert—1521

Multimodal Not comparable

Claude Mythos Preview: —, Kimi K3: 37.8 (#70)

BenchmarkClaude Mythos PreviewKimi K3
Blueprint-Bench 2—29.5%
Furniture Assembly—34.2%

Multilingual Not comparable

Claude Mythos Preview: —, Kimi K3: 56.3 (#21)

BenchmarkClaude Mythos PreviewKimi K3
LMArena Non-English—1466
LMArena Chinese—1529
LMArena French—1491
LMArena German—1488
LMArena Japanese—1487
LMArena Korean—1458
LMArena Russian—1482
LMArena Spanish—1472

Instruction Following Not comparable

Claude Mythos Preview: —, Kimi K3: 77.7 (#14)

BenchmarkClaude Mythos PreviewKimi K3
LMArena Instruction Following—1483

Long Context Not comparable

Claude Mythos Preview: —, Kimi K3: 45.8 (#29)

BenchmarkClaude Mythos PreviewKimi K3
LMArena Longer Query—1494

Writing & Preference Not comparable

Claude Mythos Preview: —, Kimi K3: 76.6 (#4)

BenchmarkClaude Mythos PreviewKimi K3
LMArena Text—1476
LMArena Creative Writing—1454
EQ-Bench Creative Writing—2082
EQ-Bench 4—1339
LMArena Multi-Turn—1488

Frequently asked questions

Is Claude Mythos Preview better than Kimi K3?

Kimi K3 has enough public results to be ranked (#15); Claude Mythos Preview does not yet, so treat this comparison as directional.

How many benchmarks do Claude Mythos Preview and Kimi K3 share?

0 benchmarks have published results for both models. Claude Mythos Preview has 2 scored results on Noometry and Kimi K3 has 53.

Related comparisons

Go deeper