Model comparison
Seed 2.0 Pro vs Sonar
Seed 2.0 Pro is the stronger model overall, scoring 43.2 to 38.5 on the Noometry Index.
Last verified . 0 shared benchmarks.
ByteDance Seed
PerplexitySummary
- The widest gap is in writing & preference, where Seed 2.0 Pro leads 62.9 to 52.6.
- Sonar is cheaper at $1 / $1 per million input/output tokens, against $0.50 / $3 for Seed 2.0 Pro.
- Seed 2.0 Pro accepts more context: 256K tokens versus 128K.
Side by side
| Seed 2.0 Pro | Sonar | |
|---|---|---|
| Provider | ByteDance Seed | Perplexity |
| Noometry Index | 43.2 | 38.5 |
| Released | 2026-02-14 | 2024-01-01 |
| Weights | Proprietary | Proprietary |
| Context window | 256K | 128K |
| Max output | 128K | 4K |
| Input $ / M tokens | $0.50 | $1 |
| Output $ / M tokens | $3 | $1 |
| Results tracked | 20 | 7 |
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Category by category
Coding Seed 2.0 Pro leads
Seed 2.0 Pro: 43.5 (#86), Sonar: 35.7 (#221)
| Benchmark | Seed 2.0 Pro | Sonar |
|---|---|---|
| LiveBench Coding | — | 35.1% |
| LMArena Coding | 1472 | — |
Reasoning Seed 2.0 Pro leads
Seed 2.0 Pro: 24.1 (#165), Sonar: 21.1 (#227)
| Benchmark | Seed 2.0 Pro | Sonar |
|---|---|---|
| NYT Connections (extended) | 28.4% | — |
| Thematic Generalization | 57.1% | — |
| LiveBench Reasoning | — | 46.3% |
| LMArena Hard Prompts | 1453 | — |
| LiveBench Data Analysis | — | 37.9% |
| LiveBench | — | 46.9% |
Math Seed 2.0 Pro leads
Seed 2.0 Pro: 39.3 (#108), Sonar: 33.7 (#200)
| Benchmark | Seed 2.0 Pro | Sonar |
|---|---|---|
| LiveBench Math | — | 41.6% |
| LMArena Math | 1439 | — |
Knowledge Not comparable
Seed 2.0 Pro: 40.2 (#122), Sonar: —
| Benchmark | Seed 2.0 Pro | Sonar |
|---|---|---|
| LMArena Expert | 1440 | — |
Multimodal Not comparable
Seed 2.0 Pro: 41.5 (#35), Sonar: —
| Benchmark | Seed 2.0 Pro | Sonar |
|---|---|---|
| LMArena Vision | 1274 | — |
Multilingual Not comparable
Seed 2.0 Pro: 54.5 (#39), Sonar: —
| Benchmark | Seed 2.0 Pro | Sonar |
|---|---|---|
| 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 Seed 2.0 Pro leads
Seed 2.0 Pro: 74.5 (#91), Sonar: 71.4 (#150)
| Benchmark | Seed 2.0 Pro | Sonar |
|---|---|---|
| LiveBench Instruction Following | — | 76.2% |
| LMArena Instruction Following | 1414 | — |
Long Context Not comparable
Seed 2.0 Pro: 43.6 (#90), Sonar: —
| Benchmark | Seed 2.0 Pro | Sonar |
|---|---|---|
| LMArena Longer Query | 1428 | — |
Writing & Preference Seed 2.0 Pro leads
Seed 2.0 Pro: 62.9 (#69), Sonar: 52.6 (#167)
| Benchmark | Seed 2.0 Pro | Sonar |
|---|---|---|
| LMArena Text | 1448 | — |
| LMArena Creative Writing | 1406 | — |
| LMArena Multi-Turn | 1441 | — |
| LiveBench Language | — | 44.1% |
Frequently asked questions
Is Seed 2.0 Pro better than Sonar?
Seed 2.0 Pro is the stronger model overall, scoring 43.2 to 38.5 on the Noometry Index.
Which is cheaper, Seed 2.0 Pro or Sonar?
Sonar is cheaper. It lists at $1 per million input tokens and $1 per million output tokens; Seed 2.0 Pro lists at $0.50 and $3.
Is Seed 2.0 Pro or Sonar better for coding?
Seed 2.0 Pro scores higher on coding benchmarks: 43.5 versus 35.7 in the Noometry coding category.
Which has the bigger context window?
Seed 2.0 Pro does, with 256K tokens against 128K.
How many benchmarks do Seed 2.0 Pro and Sonar share?
0 benchmarks have published results for both models. Seed 2.0 Pro has 20 scored results on Noometry and Sonar has 7.