AI BriefingSlopCodeBench Benchmark Points Out Opus 5's Limits in Long-Horizon Coding Performance
Key point
SlopCodeBench benchmark results showed Opus 5 passing only 4 out of 17 checkpoints, revealing a lack of reliability in long-horizon coding.
Details
Long-Horizon Coding Benchmark Results
SlopCodeBench is a long-horizon coding benchmark in which requirements are added incrementally, and Opus 5 strictly passed only 4 out of a total of 17 checkpoints. This suggests that it is not yet reliable enough to evolve a codebase without continuous intervention.
Benchmark Characteristics
SlopCodeBench reveals new requirements at each checkpoint, and models must pass all regression tests from previous stages as well. Through this structure, the benchmark evaluates a model's ability to maintain and extend code over the long term.
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