Breaking

Anthropic Reportedly Unveils Claude Fable 5.2 and Mythos 5.2, Claims 30% Speed Gain and 20% Cost Cut

November 9, 2026 at 14:06 EST

Foundation Models
Software Dev & Coding

Anthropic has announced two new models, Claude Fable 5.2 and Claude Mythos 5.2, which the company says are built on the same underlying model but use different sets of safeguards, and which it claims run 30% faster and cost 20% less than the 5.1 series.

Anthropic · Model release

Claude Fable 5.2 and Mythos 5.2: one foundation, two safeguard profiles

Anthropic says both models share the same underlying model but use different safeguard configurations. The company also claims they run 30% faster and cost 20% less than the 5.1 series, with a focus on coding.

Variants built on one shared underlying model

30%

Claimed speed gain versus the 5.1 series

20%

Claimed cost reduction versus the 5.1 series

Relative to the 5.1 series (5.1 = 10 blocks)

Company claims, not yet independently verified. Each block is one unit of the 5.1 baseline.

Speed (throughput)

1.0×

5.1 series

1.3×

5.2 (claimed)

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