Model comparison
Seed 2.0 Pro vs GPT-5.5 Pro
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 43.2 on the Noometry Index. Seed 2.0 Pro costs 60× less per token, which makes it the better buy when GPT-5.5 Pro's lead doesn't matter for your workload.
Last verified . 0 shared benchmarks.
ByteDance SeedSummary
- The widest gap is in reasoning, where GPT-5.5 Pro leads 73.3 to 24.1.
- Seed 2.0 Pro is cheaper at $0.50 / $3 per million input/output tokens, against $30 / $180 for GPT-5.5 Pro.
- GPT-5.5 Pro accepts more context: 1.05M tokens versus 256K.
Side by side
| Seed 2.0 Pro | GPT-5.5 Pro | |
|---|---|---|
| Provider | ByteDance Seed | OpenAI |
| Noometry Index | 43.2 | 64.3 |
| Released | 2026-02-14 | 2026-04-23 |
| Weights | Proprietary | Proprietary |
| Context window | 256K | 1.05M |
| Max output | 128K | 128K |
| Input $ / M tokens | $0.50 | $30 |
| Output $ / M tokens | $3 | $180 |
| Results tracked | 20 | 14 |
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Category by category
Coding Not comparable
Seed 2.0 Pro: 43.5 (#86), GPT-5.5 Pro: —
| Benchmark | Seed 2.0 Pro | GPT-5.5 Pro |
|---|---|---|
| LMArena Coding | 1472 | — |
Reasoning GPT-5.5 Pro leads
Seed 2.0 Pro: 24.1 (#165), GPT-5.5 Pro: 73.3 (#10)
| Benchmark | Seed 2.0 Pro | GPT-5.5 Pro |
|---|---|---|
| ARC-AGI-2 | — | 84.6% |
| SimpleBench | — | 76.9% |
| NYT Connections (extended) | 28.4% | — |
| ARC-AGI-1 | — | 96.5% |
| CritPt | — | 30.6% |
| Chess Puzzles | — | 64% |
| Thematic Generalization | 57.1% | — |
| LMArena Hard Prompts | 1453 | — |
| DTBench | — | 96% |
| LMCA | — | 53.9% |
| Epoch Capabilities Index | — | 162.07 |
Math GPT-5.5 Pro leads
Seed 2.0 Pro: 39.3 (#108), GPT-5.5 Pro: 84.0 (#10)
| Benchmark | Seed 2.0 Pro | GPT-5.5 Pro |
|---|---|---|
| FrontierMath (Tiers 1-3) | — | 87.7% |
| FrontierMath Tier 4 | — | 78% |
| OTIS Mock AIME 2024-2025 | — | 100% |
| LMArena Math | 1439 | — |
| FrontierMath (Feb 2025 set) | — | 52.4% |
| FrontierMath Tier 4 (v1) | — | 39.6% |
Knowledge GPT-5.5 Pro leads
Seed 2.0 Pro: 40.2 (#122), GPT-5.5 Pro: 64.1 (#19)
| Benchmark | Seed 2.0 Pro | GPT-5.5 Pro |
|---|---|---|
| GPQA Diamond | — | 93.9% |
| LMArena Expert | 1440 | — |
Multimodal Not comparable
Seed 2.0 Pro: 41.5 (#35), GPT-5.5 Pro: —
| Benchmark | Seed 2.0 Pro | GPT-5.5 Pro |
|---|---|---|
| LMArena Vision | 1274 | — |
Multilingual Not comparable
Seed 2.0 Pro: 54.5 (#39), GPT-5.5 Pro: —
| Benchmark | Seed 2.0 Pro | GPT-5.5 Pro |
|---|---|---|
| LMArena Non-English | 1441 | — |
| LMArena Chinese | 1489 | — |
| LMArena French | 1471 | — |
| LMArena German | 1442 | — |
| LMArena Japanese | 1408 | — |
| LMArena Korean | 1411 | — |
| LMArena Russian | 1449 | — |
| LMArena Spanish | 1460 | — |
Instruction Following Not comparable
Seed 2.0 Pro: 74.5 (#91), GPT-5.5 Pro: —
| Benchmark | Seed 2.0 Pro | GPT-5.5 Pro |
|---|---|---|
| LMArena Instruction Following | 1414 | — |
Long Context Not comparable
Seed 2.0 Pro: 43.6 (#90), GPT-5.5 Pro: —
| Benchmark | Seed 2.0 Pro | GPT-5.5 Pro |
|---|---|---|
| LMArena Longer Query | 1428 | — |
Writing & Preference Not comparable
Seed 2.0 Pro: 62.9 (#69), GPT-5.5 Pro: —
| Benchmark | Seed 2.0 Pro | GPT-5.5 Pro |
|---|---|---|
| LMArena Text | 1448 | — |
| LMArena Creative Writing | 1406 | — |
| LMArena Multi-Turn | 1441 | — |
Frequently asked questions
Is Seed 2.0 Pro better than GPT-5.5 Pro?
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 43.2 on the Noometry Index. Seed 2.0 Pro costs 60× less per token, which makes it the better buy when GPT-5.5 Pro's lead doesn't matter for your workload.
Which is cheaper, Seed 2.0 Pro or GPT-5.5 Pro?
Seed 2.0 Pro is cheaper. It lists at $0.50 per million input tokens and $3 per million output tokens; GPT-5.5 Pro lists at $30 and $180.
Which has the bigger context window?
GPT-5.5 Pro does, with 1.05M tokens against 256K.
How many benchmarks do Seed 2.0 Pro and GPT-5.5 Pro share?
0 benchmarks have published results for both models. Seed 2.0 Pro has 20 scored results on Noometry and GPT-5.5 Pro has 14.