Seed-Prover 1.5
Seed-Prover 1.5 places in the top three on PutnamBench.
ByteDance Seed Released December 19th, 2025 Family Seed-Prover The lab's model card Compare with others 5
Benchmarks with a score
0
Ranked first, out of five or more models
1
In the top three
ByteDance Seed Dec 2025 Seed-Prover 1.5
Closed weights Mid-size
No Epoch Capabilities Index score yet
- PutnamBench 86.5% #2 /12
Where it ranks
Its best score on each benchmark, and where that ranks among every model with a score there. We rank each model once, at its best setting.
Math and science
| Benchmark | Score | Rank | Source | |
|---|---|---|---|---|
| PutnamBench | 86.5% | #2 of 12 | Official leaderboard | |
| CombiBench | 48% | #1 of 3 | Lab model card | |
| FATE-H | 80% | #2 of 2 | Lab model card | |
| FATE-X | 33% | #2 of 2 | Lab model card | |
| Putnam 2025 | 11.0 | #2 of 2 | Lab model card |
Its lab's number next to a leaderboard
Where the benchmark's own leaderboard, or Epoch AI's run, also has this model. Gaps mostly come from different harnesses, effort levels and task subsets. Every pair.
| Benchmark | Lab says | Board says | Gap |
|---|---|---|---|
| PutnamBench | 87.9% PutnamBench 580/660 (87.9%) | 86.5% Leaderboard, 10 H20 days per problem | +1.4 pts |
Its launch post
The benchmarks the lab chose to headline, with the scores it gave.