Claude Opus 5.5 vs DeepSeek-V4-Flash
30 SHARED BENCHMARKSAcross 30 shared benchmarks, Claude Opus 5.5 scores higher on 30 and DeepSeek-V4-Flash on 0. The widest gap is AA-Omniscience · Non-hallucination, where Claude Opus 5.5 scores 41.4 against 8.3. DeepSeek-V4-Flash is the cheaper of the two on tracked API pricing ($0.44 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 DeepSeek-V4-Flash. Prices: Artificial Analysis for Claude Opus 5.5; Artificial Analysis for DeepSeek-V4-Flash. ◆ = independently verified score.
Where each leadsby capability area · benchmark wins
Biggest gaps
Claude Opus 5.5 pulls furthest ahead on
- AA-Omniscience · Non-hallucination41.4 vs 8.3
- Terminal-Bench 4.059.6 vs 12.1
- FrontierMath Tier 495 vs 24.4
DeepSeek-V4-Flash pulls furthest ahead on
No ratified-area lead of 3 points or more.
Every shared benchmark30 · grouped by area
Reasoning 5
Coding 6
Agentic 3
Factuality 3
Instruction Following 1
Long Context 1
Math 3
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.