Claude Fable 5.1 vs. Fable 5: On real work, I couldn’t tell them apart.
Anthropic launched Claude Fable 5.1 this week, calling it “our most advanced model for coding and knowledge work.” There was The post Claude Fable 5.1 vs. Fable 5: On real work, I couldn’t tell them apart. appeared first on The New Stack .
Claude Fable 5.1 and Fable 5 were announced by Anthropic as two advanced models for coding and knowledge work. The new model, Fable 5.1, was said to be the strongest coding model tested by CEO Dan Shipper after a week of testing. However, a real-world test revealed that Fable 5 was as accurate, cheaper, and faster on the hardest task compared to Fable 5.1.
The tests involved four tasks that mimic real work: agentic research, agentic coding, reasoning, and sensor data audit. Both models finished the tasks correctly, but Fable 5 was more efficient in terms of token usage, cost, and time.
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