Claude Fable 5 review: 5-3 over Opus 4.8, GPT-5.5 timed out
Claude Fable 5 review with real benchmark data: 5-3 over Opus 4.8, 3-0 vs GPT-5.5 on 12 coding and reasoning prompts. Includes subscription break-even math.
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Claude Fable 5 review with real benchmark data: 5-3 over Opus 4.8, 3-0 vs GPT-5.5 on 12 coding and reasoning prompts. Includes subscription break-even math.
We ran 12 coding, math, and data tasks through Opus 4.8, Opus 4.7, and GPT-5.5 via LLMTest. Opus 4.8 swept GPT-5.5 but split with its predecessor.
We ran 20 real prompts through Claude Sonnet 4.5 and GPT-5. Claude won 8 of 15 comparisons, ran 1.7x faster, and GPT-5 timed out on 5 of 20.
We ran 15 real coding tasks through Claude Opus 4.7 and GPT-5.5 via LLMTest. Claude won 10, GPT-5.5 won 2, 3 ties. Full outputs and verdict inside.
Opus 4.7 scores higher on coding benchmarks and adds 3.75MP vision, but its new tokenizer inflates real cost by up to 35%. Here's what changed.