Model comparison
Seed 2.0 Pro vs gpt-oss-20b
Seed 2.0 Pro is the stronger model overall, scoring 43.2 to 32.5 on the Noometry Index. gpt-oss-20b costs 31× less per token, which makes it the better buy when Seed 2.0 Pro's lead doesn't matter for your workload.
Last verified . 16 shared benchmarks.
ByteDance SeedSummary
- They share 16 benchmarks with published results for both. Seed 2.0 Pro scores higher in 7 categories and gpt-oss-20b in 1 category; 7 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Seed 2.0 Pro leads 62.9 to 35.5.
- gpt-oss-20b is cheaper at $0.018 / $0.09 per million input/output tokens, against $0.50 / $3 for Seed 2.0 Pro.
- Seed 2.0 Pro accepts more context: 256K tokens versus 131K.
- gpt-oss-20b has downloadable open weights; the other is API-only.
Side by side
| Seed 2.0 Pro | gpt-oss-20b | |
|---|---|---|
| Provider | ByteDance Seed | OpenAI |
| Noometry Index | 43.2 | 32.5 |
| Released | 2026-02-14 | 2025-08-05 |
| Weights | Proprietary | Open |
| Context window | 256K | 131K |
| Max output | 128K | 16K |
| Input $ / M tokens | $0.50 | $0.018 |
| Output $ / M tokens | $3 | $0.09 |
| Results tracked | 20 | 34 |
Sponsored placements are available on pages like this one. Advertise on Noometry
Category by category
Coding Seed 2.0 Pro leads
Seed 2.0 Pro: 43.5 (#86), gpt-oss-20b: 37.6 (#192)
| Benchmark | Seed 2.0 Pro | gpt-oss-20b |
|---|---|---|
| LMArena Coding | 1472 | 1306 |
| SciCode | — | 34.4% |
| WeirdML | — | 40.9% |
| ALE-Bench | — | 566.05 |
Agentic & Tool Use Not comparable
Seed 2.0 Pro: —, gpt-oss-20b: 9.3 (#154)
| Benchmark | Seed 2.0 Pro | gpt-oss-20b |
|---|---|---|
| Terminal-Bench | — | 3.4% |
Reasoning Seed 2.0 Pro leads
Seed 2.0 Pro: 24.1 (#165), gpt-oss-20b: 19.3 (#261)
| Benchmark | Seed 2.0 Pro | gpt-oss-20b |
|---|---|---|
| LMArena Hard Prompts | 1453 | 1274 |
| Kagi LLM Benchmark | — | 53.2% |
| NYT Connections (extended) | 28.4% | — |
| CritPt | — | 1.4% |
| Chess Puzzles | — | 4% |
| Thematic Generalization | 57.1% | — |
| DTBench | — | 68% |
| LMCA | — | 14.5% |
| Epoch Capabilities Index | — | 137.82 |
Math Too close to call
Seed 2.0 Pro: 39.3 (#108), gpt-oss-20b: 39.4 (#103)
| Benchmark | Seed 2.0 Pro | gpt-oss-20b |
|---|---|---|
| LMArena Math | 1439 | 1317 |
| OTIS Mock AIME 2024-2025 | — | 65.3% |
| Omni-MATH | — | 56.5% |
Knowledge Seed 2.0 Pro leads
Seed 2.0 Pro: 40.2 (#122), gpt-oss-20b: 34.6 (#195)
| Benchmark | Seed 2.0 Pro | gpt-oss-20b |
|---|---|---|
| LMArena Expert | 1440 | 1258 |
| GPQA Diamond | — | 60.8% |
| MMLU-Pro | — | 74% |
| GPQA (HELM) | — | 59.4% |
Multimodal Not comparable
Seed 2.0 Pro: 41.5 (#35), gpt-oss-20b: —
| Benchmark | Seed 2.0 Pro | gpt-oss-20b |
|---|---|---|
| LMArena Vision | 1274 | — |
Multilingual Seed 2.0 Pro leads
Seed 2.0 Pro: 54.5 (#39), gpt-oss-20b: 42.2 (#197)
| Benchmark | Seed 2.0 Pro | gpt-oss-20b |
|---|---|---|
| LMArena Non-English | 1441 | 1268 |
| LMArena Chinese | 1489 | 1314 |
| LMArena German | 1442 | 1255 |
| LMArena Japanese | 1408 | 1244 |
| LMArena Korean | 1411 | 1236 |
| LMArena Russian | 1449 | 1278 |
| LMArena Spanish | 1460 | 1267 |
| LMArena French | 1471 | — |
Instruction Following Seed 2.0 Pro leads
Seed 2.0 Pro: 74.5 (#91), gpt-oss-20b: 61.8 (#240)
| Benchmark | Seed 2.0 Pro | gpt-oss-20b |
|---|---|---|
| LMArena Instruction Following | 1414 | 1236 |
| IFEval | — | 73.2% |
Long Context Seed 2.0 Pro leads
Seed 2.0 Pro: 43.6 (#90), gpt-oss-20b: 37.9 (#209)
| Benchmark | Seed 2.0 Pro | gpt-oss-20b |
|---|---|---|
| LMArena Longer Query | 1428 | 1250 |
Writing & Preference Seed 2.0 Pro leads
Seed 2.0 Pro: 62.9 (#69), gpt-oss-20b: 35.5 (#265)
| Benchmark | Seed 2.0 Pro | gpt-oss-20b |
|---|---|---|
| LMArena Text | 1448 | 1287 |
| LMArena Creative Writing | 1406 | 1201 |
| LMArena Multi-Turn | 1441 | 1268 |
| EQ-Bench Creative Writing | — | 666 |
| WildBench | — | 73.7% |
Frequently asked questions
Is Seed 2.0 Pro better than gpt-oss-20b?
Seed 2.0 Pro is the stronger model overall, scoring 43.2 to 32.5 on the Noometry Index. gpt-oss-20b costs 31× 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 gpt-oss-20b?
gpt-oss-20b is cheaper. It lists at $0.018 per million input tokens and $0.09 per million output tokens; Seed 2.0 Pro lists at $0.50 and $3.
Is Seed 2.0 Pro or gpt-oss-20b better for coding?
Seed 2.0 Pro scores higher on coding benchmarks: 43.5 versus 37.6 in the Noometry coding category.
Which has the bigger context window?
Seed 2.0 Pro does, with 256K tokens against 131K.
How many benchmarks do Seed 2.0 Pro and gpt-oss-20b share?
16 benchmarks have published results for both models. Seed 2.0 Pro has 20 scored results on Noometry and gpt-oss-20b has 34.