Anthropic

Anthropic promises Fable-level results at 40 percent lower cost than Opus 5. What is independently measured, what a task costs, where the catch is.

Anthropic leads nine benchmarks, independent runs are much closer. What Claude Fable 5.1 delivers, what it costs and when Opus 5 is enough.

An August date, unchanged prices: I traced the sources. What is actually proven about Claude Fable 5.1 and how to spot a real leak.

Claude Opus 5 after five days: effectively tied in the Intelligence Index, a 50 percent hallucination rate and rank 5 in the blind user vote.

Claude Opus 5 benchmarked: first place in the Intelligence Index with 61 points, half the Fable 5 price and the cost paradox of verbosity.

The US government shut down Claude Fable 5, and three weeks later it was back. Timeline, the Amazon report, the new safeguard and what it means for firms.