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AIVentureBeat2 days ago
GPT-5.5 tops new Agents' Last Exam benchmarkOpenAI's GPT-5.5 from April, using the Codex harness, scored 24.0% on the new Agents' Last Exam benchmark, beating Anthropic's Mythos-class Claude Fable 5. The benchmark, created by UC Berkeley's RDI and over 300 experts, measures AI performance on long-horizon professional workflows.
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