Claude Sonnet 4 vs Gemini 2.5 Flash (Sep 2025)

Verdict

Gemini 2.5 Flash (Sep 2025) leads 2–1 across 3 shared benchmarks.

Claude Sonnet 4 1 · Gemini 2.5 Flash (Sep 2025) 2 · higher isn't always better — check the caveats below.

Per-benchmark head-to-head

Reported scores — protocols may differ. How we compare

Sort

Claude Sonnet 4Gemini 2.5 Flash (Sep 2025)

33.1
AThe Agent Company
41.1
1
AVPCT
19.3
46.11
AWeirdML
41.91

A higher score does not always mean a better model. Each number is task performance under a disclosed harness. Of the 6 measurements across 3 shared benchmarks, 6 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

Gemini 2.5 Flash (Sep 2025) leads 2–1 across 3 shared benchmarks. Claude Sonnet 4 leads 1 benchmark and Gemini 2.5 Flash (Sep 2025) leads 2. Higher isn't always better — see the integrity caveats on each benchmark.

Claude Sonnet 4 and Gemini 2.5 Flash (Sep 2025) have 3 benchmarks in common in our data — those are the only rows where a direct, apples-to-apples comparison is drawn.

Claude Sonnet 4 vs Gemini 2.5 Flash (Sep 2025)

Per-benchmark head-to-head

Frequently asked questions

Follow the record

These models

Same tier

Claude Sonnet 4 vs Gemini 2.5 Flash (Sep 2025)

Per-benchmark head-to-head

Frequently asked questions

Follow the record

These models

Same tier