GPT-5.5 vs Seed 2.1 Pro Preview
40 SHARED BENCHMARKSAcross 40 shared benchmarks, GPT-5.5 scores higher on 15 and Seed 2.1 Pro Preview on 25. The widest gap is DeepSWE, where GPT-5.5 scores 70 against 32.7.
OPENAIVSBYTEDANCE40 SHARED15–25 HEAD-TO-HEADNEWEST SCORE ADDED
At a glance
MakerOpenAIByteDance
Released—
Price per 1M tokens input / output$5.00 / $30.00—
Cost of 1M in + 1M out$35.00—
Head-to-head of 40 shared benchmarks15 wins25 wins
Scores tracked independently verified185 29 ◆66 1 ◆
GPT-5.5's release date per Artificial Analysis. Prices: Artificial Analysis for GPT-5.5. ◆ = independently verified score.
Where each leadsby capability area · benchmark wins
AreaGPT-5.5WINSSeed 2.1 Pro Preview
Biggest gaps
GPT-5.5 pulls furthest ahead on
- ARC-AGI-285 vs 62.5
- Terminal-Bench 2.184.3 vs 71
- AA ApexAgents37.7 vs 33.8
Seed 2.1 Pro Preview pulls furthest ahead on
- GDPVal87.9 vs 41.8
- Humanity's Last Exam55.7 vs 45.8
- MCP Atlas83.8 vs 75.3
Every shared benchmark40 · grouped by area
Reasoning 2
Coding 4
Agentic 5
Multimodal 4
Other shared benchmarks 25
Finance Agent v1.165.360.7
HLE-Verified (no tool)50.442.9
MathVerse (Vision-Only)84.689.7
MMSIBench (circular)3635.9
Office QA Pro [Multimodal]69.572.2
ZeroBench (main)1318
ZeroBench (sub)4149.4
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.