Model comparison
Seed 2.0 Pro vs GPT-5.1-Codex
Seed 2.0 Pro is the stronger model overall, scoring 42.5 to 38.2 on the Noometry Index.
Last verified . 0 shared benchmarks.
ByteDance SeedSummary
- The widest gap is in math, where Seed 2.0 Pro leads 36.5 to 29.3.
- Seed 2.0 Pro is cheaper at $0.50 / $3 per million input/output tokens, against $1.25 / $10 for GPT-5.1-Codex.
- GPT-5.1-Codex accepts more context: 400K tokens versus 256K.
Side by side
| Seed 2.0 Pro | GPT-5.1-Codex | |
|---|---|---|
| Provider | ByteDance Seed | OpenAI |
| Noometry Index | 42.5 | 38.2 |
| Released | 2026-02-14 | 2025-11-12 |
| Weights | Proprietary | Proprietary |
| Context window | 256K | 400K |
| Max output | 128K | 128K |
| Input $ / M tokens | $0.50 | $1.25 |
| Output $ / M tokens | $3 | $10 |
| Results tracked | 20 | 6 |
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Category by category
Coding Seed 2.0 Pro leads
Seed 2.0 Pro: 42.9 (#84), GPT-5.1-Codex: 41.7 (#107)
| Benchmark | Seed 2.0 Pro | GPT-5.1-Codex |
|---|---|---|
| SWE-bench Verified (bash only) | — | 66% |
| LMArena WebDev | — | 1337 |
| LMArena Coding | 1472 | — |
| ALE-Bench | — | 1,245 |
Agentic & Tool Use Not comparable
Seed 2.0 Pro: —, GPT-5.1-Codex: 37.8 (#32)
| Benchmark | Seed 2.0 Pro | GPT-5.1-Codex |
|---|---|---|
| Terminal-Bench | — | 60.4% |
| METR Time Horizons | — | 70.8% |
Reasoning Not comparable
Seed 2.0 Pro: 23.1 (#167), GPT-5.1-Codex: —
| Benchmark | Seed 2.0 Pro | GPT-5.1-Codex |
|---|---|---|
| NYT Connections (extended) | 28.4% | — |
| Thematic Generalization | 57.1% | — |
| LMArena Hard Prompts | 1453 | — |
Math Seed 2.0 Pro leads
Seed 2.0 Pro: 36.5 (#110), GPT-5.1-Codex: 29.3 (#218)
| Benchmark | Seed 2.0 Pro | GPT-5.1-Codex |
|---|---|---|
| ProofBench | — | 9% |
| LMArena Math | 1440 | — |
Knowledge Not comparable
Seed 2.0 Pro: 39.6 (#119), GPT-5.1-Codex: —
| Benchmark | Seed 2.0 Pro | GPT-5.1-Codex |
|---|---|---|
| LMArena Expert | 1440 | — |
Multimodal Not comparable
Seed 2.0 Pro: 40.8 (#34), GPT-5.1-Codex: —
| Benchmark | Seed 2.0 Pro | GPT-5.1-Codex |
|---|---|---|
| LMArena Vision | 1275 | — |
Multilingual Not comparable
Seed 2.0 Pro: 54.8 (#37), GPT-5.1-Codex: —
| Benchmark | Seed 2.0 Pro | GPT-5.1-Codex |
|---|---|---|
| LMArena Non-English | 1442 | — |
| LMArena Chinese | 1490 | — |
| LMArena French | 1470 | — |
| LMArena German | 1443 | — |
| LMArena Japanese | 1408 | — |
| LMArena Korean | 1412 | — |
| LMArena Russian | 1450 | — |
| LMArena Spanish | 1460 | — |
Instruction Following Not comparable
Seed 2.0 Pro: 74.7 (#86), GPT-5.1-Codex: —
| Benchmark | Seed 2.0 Pro | GPT-5.1-Codex |
|---|---|---|
| LMArena Instruction Following | 1414 | — |
Long Context Not comparable
Seed 2.0 Pro: 43.6 (#85), GPT-5.1-Codex: —
| Benchmark | Seed 2.0 Pro | GPT-5.1-Codex |
|---|---|---|
| LMArena Longer Query | 1428 | — |
Writing & Preference Not comparable
Seed 2.0 Pro: 63.0 (#66), GPT-5.1-Codex: —
| Benchmark | Seed 2.0 Pro | GPT-5.1-Codex |
|---|---|---|
| LMArena Text | 1448 | — |
| LMArena Creative Writing | 1406 | — |
| LMArena Multi-Turn | 1441 | — |
Frequently asked questions
Is Seed 2.0 Pro better than GPT-5.1-Codex?
Seed 2.0 Pro is the stronger model overall, scoring 42.5 to 38.2 on the Noometry Index.
Which is cheaper, Seed 2.0 Pro or GPT-5.1-Codex?
Seed 2.0 Pro is cheaper. It lists at $0.50 per million input tokens and $3 per million output tokens; GPT-5.1-Codex lists at $1.25 and $10.
Is Seed 2.0 Pro or GPT-5.1-Codex better for coding?
Seed 2.0 Pro scores higher on coding benchmarks: 42.9 versus 41.7 in the Noometry coding category.
Which has the bigger context window?
GPT-5.1-Codex does, with 400K tokens against 256K.
How many benchmarks do Seed 2.0 Pro and GPT-5.1-Codex share?
0 benchmarks have published results for both models. Seed 2.0 Pro has 20 scored results on Noometry and GPT-5.1-Codex has 6.