AInstein-SWE-Bench
Seed2.0 Pro 47.7% leads since February 2026 Agents fix issues and add features in production scientific code repositories, such as quantum chemistry and astrophysics codes. Fail-to-pass tests in containers check each change.
In-house Seed benchmark. The Seed2.0 model card calls it Ainstain Bench.
- Made by
- ByteDance Seed
- Released
- December 2025
- Kind
- Scientific code
- Level
- Expert
- Scored
- Checked automatically
- Answers
- Agent task
- Tasks
- Kept private
- Last in a launch post
- December 2025, dropped before it saturated
- Last model added
- March 2026
Seed2.0 Pro leads with 47.7%
Best score per model as labs report them in their own cards. Labs pick their own settings, so these compare less cleanly than independent runs.
- 1 Seed2.0 Pro 47.7%
- 2 Seed1.8 36.7%
Source: Labs’ model cards
| # | Model | Score | Setting | Date | Source |
|---|---|---|---|---|---|
| 1 | Seed2.0 Pro | 47.7% | Feb 2026 | Lab model card | |
| 2 | Seed1.8 | 36.7% | Dec 2025 | Lab model card |
2 models have held number one in labs’ own numbers since its release in December 2025
Lab claims count from the day the card came out, independent runs from the model’s release.
Source: Labs’ model cards
Scores over time
All the scores we have, one dot each, so a model tested at several settings appears more than once.
Source: Labs’ model cards
Labs headline it less often now, last in December 2025
Launch posts from every lab that has listed it, one tick per post. Tall colored ticks include it, and short gray ones leave it out.
| Date | Launch post | Score | As the post writes it |
|---|---|---|---|
| Dec 18, 2025 | Seed1.8 | 36.7 | AInstein-SWE-Bench |
2 system cards report it, from 1 lab
Besides launch posts, we read the system cards, model cards and technical reports labs publish with a release. They report far more, including safety and frontier-risk tests.
| Date | Document | Score | As the document writes it | Section |
|---|---|---|---|---|
| Mar 21, 2026 | Seed1.8 model card | 36.7 | AInstein-SWE-Bench (Table 4) | Capabilities |
| Feb 14, 2026 | Seed2.0 Pro model card | 47.7 | AInstein Bench (Table 13), Ainstain Bench in 3.4 | Capabilities |
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