APEX-Agents Benchmark: Leading AI Models Fail 75% of Complex Workplace Tasks

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The newly released APEX-Agents benchmark reveals that leading AI models fail more than 75% of complex, multi-step workplace tasks — even as Claude Opus 4.5 hits 80.9% on SWE-Bench Verified. The gap between coding benchmarks and real enterprise workflows highlights that agent reliability in production environments with ambiguous requirements, cross-system dependencies, and exception handling remains the critical unsolved problem. Builders should set expectations accordingly.