Blog
Jun. 23, 2026
Submission Guide
How to turn a programbench eval run into a public leaderboard submission, end to end.
Jun. 15, 2026
ProgramBench Harness Fixes
A batch of fairness and reliability fixes that crack down on newly discovered ways for agents to cheat, improve reproducibility, and clear up false-negative test failures.
May. 12, 2026
GPT 5.5 high Solves First Instance!
GPT 5.5 with high reasoning becomes the first model to fully resolve a ProgramBench task instance.
May. 5, 2026
Is ProgramBench Impossible?
ProgramBench is hard by design, but it is solvable by construction. We address common concerns about feasibility.
May. 4, 2026
ProgramBench Released
Introducing ProgramBench with 200 task instances across C/C++, Go, and Rust.