Model comparison
Claude Sonnet 4.5 vs Seed 2.0 Pro
Claude Sonnet 4.5 and Seed 2.0 Pro score almost the same on the Noometry Index (44.1 vs 43.2), so choose on price, context window or the category you care about most.
Last verified . 18 shared benchmarks.
ByteDance SeedSummary
- They share 18 benchmarks with published results for both. Claude Sonnet 4.5 scores higher in 6 categories and Seed 2.0 Pro in 3 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Claude Sonnet 4.5 leads 48.4 to 40.2.
- The biggest single-benchmark swing is NYT Connections (extended): 37.3% for Claude Sonnet 4.5 and 28.4% for Seed 2.0 Pro.
- Seed 2.0 Pro is cheaper at $0.50 / $3 per million input/output tokens, against $3 / $15 for Claude Sonnet 4.5.
- Seed 2.0 Pro accepts more context: 256K tokens versus 200K.
Side by side
| Claude Sonnet 4.5 | Seed 2.0 Pro | |
|---|---|---|
| Provider | Anthropic | ByteDance Seed |
| Noometry Index | 44.1 | 43.2 |
| Released | 2025-09-29 | 2026-02-14 |
| Weights | Proprietary | Proprietary |
| Context window | 200K | 256K |
| Max output | 64K | 128K |
| Input $ / M tokens | $3 | $0.50 |
| Output $ / M tokens | $15 | $3 |
| Results tracked | 73 | 20 |
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Category by category
Coding Claude Sonnet 4.5 leads
Claude Sonnet 4.5: 47.3 (#61), Seed 2.0 Pro: 43.5 (#86)
| Benchmark | Claude Sonnet 4.5 | Seed 2.0 Pro |
|---|---|---|
| LMArena Coding | 1489 | 1472 |
| SWE-bench Verified | 71.3% | — |
| SWE-bench Verified (bash only) | 71.4% | — |
| LMArena WebDev | 1393 | — |
| SWE-bench Multilingual | 67% | — |
| SciCode | 44.7% | — |
| GSO | 14.7% | — |
| WeirdML | 47.7% | — |
| ALE-Bench | 796.15 | — |
| AlgoTune | 1.52 | — |
Agentic & Tool Use Not comparable
Claude Sonnet 4.5: 38.3 (#32), Seed 2.0 Pro: —
| Benchmark | Claude Sonnet 4.5 | Seed 2.0 Pro |
|---|---|---|
| Terminal-Bench | 46.5% | — |
| Berkeley Function Calling Leaderboard | 73.2% | — |
| GDPval | 42.5% | — |
| Remote Labor Index | 2.1% | — |
| τ²-bench Airline | 72% | — |
| τ²-bench Banking | 25.3% | — |
| τ²-bench Retail | 72.4% | — |
| τ²-bench Telecom | 84.9% | — |
| Cybench | 60% | — |
| DeepResearch Bench | 52.6% | — |
| OSWorld | 62.9% | — |
| LMArena Search | 1159 | — |
| METR Time Horizons | 67.4% | — |
| Vending-Bench 2 | 3,839 | — |
Reasoning Claude Sonnet 4.5 leads
Claude Sonnet 4.5: 26.9 (#125), Seed 2.0 Pro: 24.1 (#165)
| Benchmark | Claude Sonnet 4.5 | Seed 2.0 Pro |
|---|---|---|
| NYT Connections (extended) | 37.3% | 28.4% |
| LMArena Hard Prompts | 1462 | 1453 |
| ARC-AGI-2 | 13.6% | — |
| SimpleBench | 54.3% | — |
| Kagi LLM Benchmark | 57.9% | — |
| ARC-AGI-1 | 63.7% | — |
| CritPt | 1.1% | — |
| Chess Puzzles | 12% | — |
| EnigmaEval | 6% | — |
| Thematic Generalization | — | 57.1% |
| EBR-Bench | 2.4% | — |
| Mystery Game Puzzles | 17% | — |
| DTBench | 83.2% | — |
| LMCA | 38.8% | — |
| Epoch Capabilities Index | 146.84 | — |
| ForecastBench | 61.9 | — |
Math Seed 2.0 Pro leads
Claude Sonnet 4.5: 32.3 (#216), Seed 2.0 Pro: 39.3 (#108)
| Benchmark | Claude Sonnet 4.5 | Seed 2.0 Pro |
|---|---|---|
| LMArena Math | 1449 | 1439 |
| FrontierMath (Tiers 1-3) | 23.9% | — |
| FrontierMath Tier 4 | 2.4% | — |
| OTIS Mock AIME 2024-2025 | 77.8% | — |
| ProofBench | 19% | — |
| Omni-MATH | 55.3% | — |
| MATH Level 5 | 97.7% | — |
| FrontierMath (Feb 2025 set) | 15.2% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |
Knowledge Claude Sonnet 4.5 leads
Claude Sonnet 4.5: 48.4 (#76), Seed 2.0 Pro: 40.2 (#122)
| Benchmark | Claude Sonnet 4.5 | Seed 2.0 Pro |
|---|---|---|
| LMArena Expert | 1482 | 1440 |
| GPQA Diamond | 82.3% | — |
| Humanity's Last Exam | 13.7% | — |
| SimpleQA Verified | 30.7% | — |
| MMLU-Pro | 86.9% | — |
| Vectara Hallucination Rate | 12% | — |
| GPQA (HELM) | 68.6% | — |
Multimodal Seed 2.0 Pro leads
Claude Sonnet 4.5: 34.8 (#89), Seed 2.0 Pro: 41.5 (#35)
| Benchmark | Claude Sonnet 4.5 | Seed 2.0 Pro |
|---|---|---|
| LMArena Vision | — | 1274 |
| VPCT | 39.8% | — |
| LMArena Document | 1450 | — |
Multilingual Seed 2.0 Pro leads
Claude Sonnet 4.5: 53.4 (#69), Seed 2.0 Pro: 54.5 (#39)
| Benchmark | Claude Sonnet 4.5 | Seed 2.0 Pro |
|---|---|---|
| LMArena Non-English | 1425 | 1441 |
| LMArena Chinese | 1459 | 1489 |
| LMArena French | 1458 | 1471 |
| LMArena German | 1427 | 1442 |
| LMArena Japanese | 1390 | 1408 |
| LMArena Korean | 1403 | 1411 |
| LMArena Russian | 1437 | 1449 |
| LMArena Spanish | 1457 | 1460 |
Instruction Following Too close to call
Claude Sonnet 4.5: 75.0 (#78), Seed 2.0 Pro: 74.5 (#91)
| Benchmark | Claude Sonnet 4.5 | Seed 2.0 Pro |
|---|---|---|
| LMArena Instruction Following | 1459 | 1414 |
| IFEval | 85% | — |
Long Context Claude Sonnet 4.5 leads
Claude Sonnet 4.5: 45.2 (#46), Seed 2.0 Pro: 43.6 (#90)
| Benchmark | Claude Sonnet 4.5 | Seed 2.0 Pro |
|---|---|---|
| LMArena Longer Query | 1476 | 1428 |
Writing & Preference Claude Sonnet 4.5 leads
Claude Sonnet 4.5: 66.5 (#34), Seed 2.0 Pro: 62.9 (#69)
| Benchmark | Claude Sonnet 4.5 | Seed 2.0 Pro |
|---|---|---|
| LMArena Text | 1439 | 1448 |
| LMArena Creative Writing | 1442 | 1406 |
| LMArena Multi-Turn | 1465 | 1441 |
| EQ-Bench Creative Writing | 1678 | — |
| WildBench | 85.4% | — |
Frequently asked questions
Is Claude Sonnet 4.5 better than Seed 2.0 Pro?
Claude Sonnet 4.5 and Seed 2.0 Pro score almost the same on the Noometry Index (44.1 vs 43.2), so choose on price, context window or the category you care about most.
Which is cheaper, Claude Sonnet 4.5 or Seed 2.0 Pro?
Seed 2.0 Pro is cheaper. It lists at $0.50 per million input tokens and $3 per million output tokens; Claude Sonnet 4.5 lists at $3 and $15.
Is Claude Sonnet 4.5 or Seed 2.0 Pro better for coding?
Claude Sonnet 4.5 scores higher on coding benchmarks: 47.3 versus 43.5 in the Noometry coding category.
Which has the bigger context window?
Seed 2.0 Pro does, with 256K tokens against 200K.
How many benchmarks do Claude Sonnet 4.5 and Seed 2.0 Pro share?
18 benchmarks have published results for both models. Claude Sonnet 4.5 has 73 scored results on Noometry and Seed 2.0 Pro has 20.