Claude Opus 4.5 vs Seed 1.8
20 SHARED BENCHMARKSAcross 20 shared benchmarks, Claude Opus 4.5 scores higher on 11 and Seed 1.8 on 9. The widest gap is ZeroBench, where Seed 1.8 scores 11 against 3. Seed 1.8 is the cheaper of the two on tracked API pricing ($0.25 against $5.00 per million input tokens).
At a glance
Claude Opus 4.5's release date per Artificial Analysis. Prices: Anthropic's own price page for Claude Opus 4.5; deepinfra for Seed 1.8. ◆ = independently verified score.
Where each leadsby capability area · benchmark wins
Biggest gaps
Claude Opus 4.5 pulls furthest ahead on
- SWE-bench Verified80.9 vs 72.9
- OSWorld-Verified66.3 vs 61.9
- LiveCodeBench v684.8 vs 79.5
Seed 1.8 pulls furthest ahead on
- BrowseComp67.6 vs 37
- Multi-Challenge66.7 vs 59
- MathVista87.7 vs 80.2
Every shared benchmark20 · grouped by area
Coding 2
Agentic 2
Instruction Following 1
Multimodal 4
Other shared benchmarks 11
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 (anthropic-official, deepinfra), otherwise the lowest tracked offer.