Claude Opus 4.1 vs Kimi K2 (Jul 2025)

Verdict

Claude Opus 4.1 leads 3–1 across 4 shared benchmarks.

Claude Opus 4.1 3 · Kimi K2 (Jul 2025) 1 · higher isn't always better — check the caveats below.

Per-benchmark head-to-head

Reported scores — protocols may differ. How we compare

Sort

Claude Opus 4.1Kimi K2 (Jul 2025)

84.7
BLech Mazur Writing
85.6
52
ASimpleBench
11.56
38
BTerminal Bench
27.8
42.76
AWeirdML
39.36

A higher score does not always mean a better model. Each number is task performance under a disclosed harness. Of the 8 measurements across 4 shared benchmarks, 8 single-evaluator or undisclosed-protocol reports; 0% are independently reproduced. Check any benchmark's integrity grade before reading a win as decisive.

Frequently asked questions

Claude Opus 4.1 leads 3–1 across 4 shared benchmarks. Claude Opus 4.1 leads 3 benchmarks and Kimi K2 (Jul 2025) leads 1. Higher isn't always better — see the integrity caveats on each benchmark.

Claude Opus 4.1 and Kimi K2 (Jul 2025) have 4 benchmarks in common in our data — those are the only rows where a direct, apples-to-apples comparison is drawn.

Claude Opus 4.1 vs Kimi K2 (Jul 2025)

Per-benchmark head-to-head

Frequently asked questions

Follow the record

These models

Same tier

Claude Opus 4.1 vs Kimi K2 (Jul 2025)

Per-benchmark head-to-head

Frequently asked questions

Follow the record

These models

Same tier