Rasmic spent $1,000 testing Claude Fable 5, also called Mythos, and is calling it his Opus 4.5 moment, a benchmark for when a model crosses from impressive to genuinely transformative. That framing alone signals this is not a routine model release.
The video digs into what that $1,000 of actual API usage revealed about Fable 5's capabilities, which means the conclusions here are empirical, not speculative. The comparison to Opus 4.5 is a specific technical and experiential reference point worth understanding if you care about where the Claude model family sits right now.
If you want to know what breaks, what surprises, and what the cost curve looks like at real usage volume, the full video has the test results. The Greptile sponsorship also hints at code-heavy use cases being central to the evaluation.
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