Model comparison
Seed 2.0 Pro vs Mercury 2
Seed 2.0 Pro is the stronger model overall, scoring 42.5 to 38.8 on the Noometry Index. Mercury 2 costs 3.0× less per token, which makes it the better buy when Seed 2.0 Pro's lead doesn't matter for your workload.
Last verified . 11 shared benchmarks.
ByteDance SeedSummary
- They share 11 benchmarks with published results for both. Seed 2.0 Pro scores higher in 7 categories and Mercury 2 in 0 categories; 6 gaps are clear of the uncertainty.
- The widest gap is in coding, where Seed 2.0 Pro leads 42.9 to 33.2.
- Mercury 2 is cheaper at $0.25 / $0.75 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 | Mercury 2 | |
|---|---|---|
| Provider | ByteDance Seed | Inception |
| Noometry Index | 42.5 | 38.8 |
| Released | 2026-02-14 | 2026-02-20 |
| Weights | Proprietary | Proprietary |
| Context window | 256K | 128K |
| Max output | 128K | 50K |
| Input $ / M tokens | $0.50 | $0.25 |
| Output $ / M tokens | $3 | $0.75 |
| Results tracked | 20 | 17 |
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Category by category
Coding Seed 2.0 Pro leads
Seed 2.0 Pro: 42.9 (#84), Mercury 2: 33.2 (#250)
| Benchmark | Seed 2.0 Pro | Mercury 2 |
|---|---|---|
| LMArena Coding | 1472 | 1391 |
| LMArena WebDev | — | 1170 |
| SciCode | — | 38.7% |
| WeirdML | — | 43.2% |
| ALE-Bench | — | 785.58 |
Reasoning Too close to call
Seed 2.0 Pro: 23.1 (#167), Mercury 2: 23.0 (#170)
| Benchmark | Seed 2.0 Pro | Mercury 2 |
|---|---|---|
| LMArena Hard Prompts | 1453 | 1362 |
| NYT Connections (extended) | 28.4% | — |
| CritPt | — | 0.8% |
| Thematic Generalization | 57.1% | — |
Math Not comparable
Seed 2.0 Pro: 36.5 (#110), Mercury 2: —
| Benchmark | Seed 2.0 Pro | Mercury 2 |
|---|---|---|
| LMArena Math | 1440 | — |
Knowledge Seed 2.0 Pro leads
Seed 2.0 Pro: 39.6 (#119), Mercury 2: 35.6 (#170)
| Benchmark | Seed 2.0 Pro | Mercury 2 |
|---|---|---|
| LMArena Expert | 1440 | 1358 |
| Vectara Hallucination Rate | — | 12.3% |
Multimodal Not comparable
Seed 2.0 Pro: 40.8 (#34), Mercury 2: —
| Benchmark | Seed 2.0 Pro | Mercury 2 |
|---|---|---|
| LMArena Vision | 1275 | — |
Multilingual Seed 2.0 Pro leads
Seed 2.0 Pro: 54.8 (#37), Mercury 2: 46.8 (#153)
| Benchmark | Seed 2.0 Pro | Mercury 2 |
|---|---|---|
| LMArena Non-English | 1442 | 1331 |
| LMArena Chinese | 1490 | 1416 |
| LMArena Russian | 1450 | 1303 |
| LMArena French | 1470 | — |
| LMArena German | 1443 | — |
| LMArena Japanese | 1408 | — |
| LMArena Korean | 1412 | — |
| LMArena Spanish | 1460 | — |
Instruction Following Seed 2.0 Pro leads
Seed 2.0 Pro: 74.7 (#86), Mercury 2: 70.4 (#161)
| Benchmark | Seed 2.0 Pro | Mercury 2 |
|---|---|---|
| LMArena Instruction Following | 1414 | 1328 |
Long Context Seed 2.0 Pro leads
Seed 2.0 Pro: 43.6 (#85), Mercury 2: 40.4 (#149)
| Benchmark | Seed 2.0 Pro | Mercury 2 |
|---|---|---|
| LMArena Longer Query | 1428 | 1329 |
Writing & Preference Seed 2.0 Pro leads
Seed 2.0 Pro: 63.0 (#66), Mercury 2: 54.0 (#151)
| Benchmark | Seed 2.0 Pro | Mercury 2 |
|---|---|---|
| LMArena Text | 1448 | 1355 |
| LMArena Creative Writing | 1406 | 1289 |
| LMArena Multi-Turn | 1441 | 1358 |
Frequently asked questions
Is Seed 2.0 Pro better than Mercury 2?
Seed 2.0 Pro is the stronger model overall, scoring 42.5 to 38.8 on the Noometry Index. Mercury 2 costs 3.0× less per token, which makes it the better buy when Seed 2.0 Pro's lead doesn't matter for your workload.
Which is cheaper, Seed 2.0 Pro or Mercury 2?
Mercury 2 is cheaper. It lists at $0.25 per million input tokens and $0.75 per million output tokens; Seed 2.0 Pro lists at $0.50 and $3.
Is Seed 2.0 Pro or Mercury 2 better for coding?
Seed 2.0 Pro scores higher on coding benchmarks: 42.9 versus 33.2 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 Mercury 2 share?
11 benchmarks have published results for both models. Seed 2.0 Pro has 20 scored results on Noometry and Mercury 2 has 17.