Anthropic's Fable 5 reaches general availability

Fable 5 went GA on June 9, opening Anthropic's new Mythos-class tier to everyday use with extra safeguards. On the coding benchmarks it sits at the top of the pile, and Claude Code running on Fable 5 posts the strongest terminal scores Anthropic has published.

Source: AnthropicRead the original

Fable 5 is the first model in Anthropic's Mythos-class tier to ship for general use. The release came wrapped in extra safety scaffolding given how capable the tier is meant to be.

Reported 95.0 percent on SWE-bench Verified, ahead of Opus 4.8
Claude Code on Fable 5 leads Terminal-Bench in Anthropic's numbers
Positioned a clear step above the already strong Opus 4.x line

Our take

Benchmark records age fast, but a Sonnet-then-Opus-then-Mythos ladder means the cheap tier you reach for tomorrow is roughly today's flagship. Plan your defaults accordingly.

This is a Setuproll summary written in our own words. For the full details, head to the source.

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