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Anthropic Opus 5

Coverage tagged anthropic opus 5.

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Data graphic: Anthropic's vendor-supplied Fable 5 launch table on SWE-Bench Pro, where Fable 5 scores 80.3% against Opus 4.8 at 69.2%, GPT-5.5 at 58.6% and Gemini 3.1 Pro at 54.2%, while the rumored Opus 5 has no published score and is only said to match Fable 5, not beat it. Side panels show Fable 5's 11.1-point lead over Opus 4.8, Humanity's Last Exam 59% vs 41.4% and 44.4% and FrontierCode 29.3% vs 5.7% results, an AA Intelligence Index of 60 for Fable 5 vs 59 for GPT-5.6 Sol, and the leak's unverified half-price claim.

stableResearch Anthropic Opus 5

Anthropic's Own Benchmark: Why the Rumored "Opus 5" Is Being Aimed at Matching — Not Beating — Its Flagship Fable 5

Leaks claim Anthropic's rumored "Opus 5" will match but not beat its flagship Fable 5. We scrutinize the unconfirmed benchmarks and what it means for buyers.

Jul 21 · 6 min