Model comparison
Seed 2.0 Pro vs Step 5 Preview
Step 5 Preview is the stronger model overall, scoring 47.9 to 43.2 on the Noometry Index.
Last verified . 14 shared benchmarks.
ByteDance Seed
StepFunSummary
- They share 14 benchmarks with published results for both. Seed 2.0 Pro scores higher in 3 categories and Step 5 Preview in 6 categories; 4 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Step 5 Preview leads 40.0 to 24.1.
- Seed 2.0 Pro is cheaper at $0.50 / $3 per million input/output tokens, against $1 / $2.70 for Step 5 Preview.
- Step 5 Preview accepts more context: 1.02M tokens versus 256K.
Side by side
| Seed 2.0 Pro | Step 5 Preview | |
|---|---|---|
| Provider | ByteDance Seed | StepFun |
| Noometry Index | 43.2 | 47.9 |
| Released | 2026-02-14 | 2026-09-16 |
| Weights | Proprietary | Proprietary |
| Context window | 256K | 1.02M |
| Max output | 128K | 66K |
| Input $ / M tokens | $0.50 | $1 |
| Output $ / M tokens | $3 | $2.70 |
| Results tracked | 20 | 18 |
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Category by category
Coding Step 5 Preview leads
Seed 2.0 Pro: 43.5 (#86), Step 5 Preview: 51.8 (#36)
| Benchmark | Seed 2.0 Pro | Step 5 Preview |
|---|---|---|
| LMArena Coding | 1472 | 1480 |
| LMArena WebDev | — | 1564 |
| SciCode | — | 58.9% |
Reasoning Step 5 Preview leads
Seed 2.0 Pro: 24.1 (#165), Step 5 Preview: 40.0 (#57)
| Benchmark | Seed 2.0 Pro | Step 5 Preview |
|---|---|---|
| LMArena Hard Prompts | 1453 | 1465 |
| NYT Connections (extended) | 28.4% | — |
| CritPt | — | 20.9% |
| Thematic Generalization | 57.1% | — |
Math Step 5 Preview leads
Seed 2.0 Pro: 39.3 (#108), Step 5 Preview: 46.1 (#72)
| Benchmark | Seed 2.0 Pro | Step 5 Preview |
|---|---|---|
| LMArena Math | 1439 | 1470 |
| ProofBench | — | 42% |
Knowledge Too close to call
Seed 2.0 Pro: 40.2 (#122), Step 5 Preview: 41.2 (#112)
| Benchmark | Seed 2.0 Pro | Step 5 Preview |
|---|---|---|
| LMArena Expert | 1440 | 1470 |
Multimodal Too close to call
Seed 2.0 Pro: 41.5 (#35), Step 5 Preview: 41.0 (#41)
| Benchmark | Seed 2.0 Pro | Step 5 Preview |
|---|---|---|
| LMArena Vision | 1274 | 1267 |
Multilingual Too close to call
Seed 2.0 Pro: 54.5 (#39), Step 5 Preview: 53.8 (#54)
| Benchmark | Seed 2.0 Pro | Step 5 Preview |
|---|---|---|
| LMArena Non-English | 1441 | 1432 |
| LMArena Chinese | 1489 | 1519 |
| LMArena Russian | 1449 | 1436 |
| LMArena Spanish | 1460 | 1439 |
| LMArena French | 1471 | — |
| LMArena German | 1442 | — |
| LMArena Japanese | 1408 | — |
| LMArena Korean | 1411 | — |
Instruction Following Step 5 Preview leads
Seed 2.0 Pro: 74.5 (#91), Step 5 Preview: 76.0 (#50)
| Benchmark | Seed 2.0 Pro | Step 5 Preview |
|---|---|---|
| LMArena Instruction Following | 1414 | 1444 |
Long Context Too close to call
Seed 2.0 Pro: 43.6 (#90), Step 5 Preview: 44.5 (#64)
| Benchmark | Seed 2.0 Pro | Step 5 Preview |
|---|---|---|
| LMArena Longer Query | 1428 | 1455 |
Writing & Preference Too close to call
Seed 2.0 Pro: 62.9 (#69), Step 5 Preview: 62.8 (#71)
| Benchmark | Seed 2.0 Pro | Step 5 Preview |
|---|---|---|
| LMArena Text | 1448 | 1442 |
| LMArena Creative Writing | 1406 | 1410 |
| LMArena Multi-Turn | 1441 | 1447 |
Frequently asked questions
Is Seed 2.0 Pro better than Step 5 Preview?
Step 5 Preview is the stronger model overall, scoring 47.9 to 43.2 on the Noometry Index.
Which is cheaper, Seed 2.0 Pro or Step 5 Preview?
Seed 2.0 Pro is cheaper. It lists at $0.50 per million input tokens and $3 per million output tokens; Step 5 Preview lists at $1 and $2.70.
Is Seed 2.0 Pro or Step 5 Preview better for coding?
Step 5 Preview scores higher on coding benchmarks: 51.8 versus 43.5 in the Noometry coding category.
Which has the bigger context window?
Step 5 Preview does, with 1.02M tokens against 256K.
How many benchmarks do Seed 2.0 Pro and Step 5 Preview share?
14 benchmarks have published results for both models. Seed 2.0 Pro has 20 scored results on Noometry and Step 5 Preview has 18.