OpenAI’s GPT-5.5 edges out Claude Fable 5 on brutal new agent benchmark
UC Berkeley's RDI just launched Agents' Last Exam (ALE), a demanding benchmark testing AI on real desktop workflows across 55 industries. OpenAI's GPT-5.5 topped the board with a 24.0% pass rate, narrowly beating Anthropic's new Claude Fable 5 at 22.0%. Why it matters: even the best models scored 0.0% on the hardest tasks, proving AI agents still struggle with genuine professional workloads.