"prep for Anthropic IPO" :)
Opus 5 is still a better deal.
Introducing Claude Fable 5.1 and Claude Mythos 5.1 \ Anthropic
Fable 5.1 cuts typical token-based costs by 25% while improving performance across coding, research, and reasoning tasks. Anthropic launches Fable 5.1 broadly and restricts Mythos 5.1 to trusted-access programs for advanced cybersecurity and biology work. Fable 5.1 reaches 52.6% on Terminal-Bench-Science, while Mythos achieves nearly 50% protein-binder hit rates.
