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In November 2025, Anthropic released a new flagship model that became the first AI system to score above 80% on the SWE-bench Verified software engineering benchmark.
Claude Opus 4.5 is correct — Anthropic released it on November 24, 2025, and it became the first AI model to score above 80% on SWE-bench Verified, a benchmark that tests how well an AI can fix real-world software bugs, reaching 80.9% while reportedly using roughly half the tokens of prior models on comparable coding tasks.
Claude Sonnet 5 and Claude Haiku 5 are both real, capable models, but neither is the specific model that hit this benchmark milestone in November 2025 — Opus, as the largest and most capable model in the family, was the one that pushed past the 80% mark.
Opus 4.5 rounded out Anthropic's '4.5' family of models, following Sonnet 4.5 and Haiku 4.5 earlier in the same year, each aimed at different balances of capability, speed, and cost.
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