Claude Opus 5.5 vs Gemini 3.5 Flash
30 SHARED BENCHMARKSAcross 30 shared benchmarks, Claude Opus 5.5 scores higher on 28 and Gemini 3.5 Flash on 2. The widest gap is Terminal-Bench 4.0, where Claude Opus 5.5 scores 59.6 against 6.6. Gemini 3.5 Flash is the cheaper of the two on tracked API pricing ($1.50 against $4.00 per million input tokens).
At a glance
Release dates: the vendor's own announcement for Claude Opus 5.5; Artificial Analysis for Gemini 3.5 Flash. Prices: Artificial Analysis for Claude Opus 5.5; Artificial Analysis for Gemini 3.5 Flash. ◆ = independently verified score.
Where each leadsby capability area · benchmark wins
Biggest gaps
Claude Opus 5.5 pulls furthest ahead on
- Terminal-Bench 4.059.6 vs 6.6
- FrontierMath Tier 495 vs 26.8
- CritPt31.7 vs 13.1
Gemini 3.5 Flash pulls furthest ahead on
- LiveBench · Instruction Following75.6 vs 65.7
Every shared benchmark30 · grouped by area
Reasoning 5
Coding 5
Agentic 3
Factuality 3
Instruction Following 1
Long Context 1
Math 3
Multimodal 1
Other shared benchmarks 8
Each score is the one the model's own page shows — the most authoritative tracked result for that benchmark, on the benchmark's standard methodology (source-attributed). ↓ marks lower-is-better metrics; ◆ an independently verified score. Open either model for its full surface, provenance and pricing. Quoted rates are the price-setter row we currently track for each model — its direct or vendor-official listing where one exists (direct, direct), otherwise the lowest tracked offer.