Anthropic has officially introduced Claude Mythos 5. Anthropic says it uses the same underlying model as Fable 5 with different safeguards, so this page stays unranked until separate measured results are available.
Pending benchmark with no placement. Claude Mythos 5 stays outside the numbered rankings until complete source results support a Vibe Coding Index score.
Release and evidence tracker
This page separates confirmed facts from details that still need an official source or independent measurement.
Claude Fable 5 is the closest measured comparison because Anthropic says both products use the same underlying model.
Source record
Polymarket live data
This related market tracks the next Mythos class release after the current model. It does not measure Claude Mythos 5 benchmark performance.
Next Mythos-Class Model released by July 31, 2026?
8.0%Next Mythos-Class Model released by August 31, 2026?
51.5%Next Mythos-Class Model released by September 30, 2026?
84.0%Prediction market prices are crowd forecasts that can change quickly. They are not official release confirmation, benchmark evidence or investment advice.
Final Intelligence, Coding and Agentic indices are pending.
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Model benchmark FAQ
Answers update from this model’s current sourced scores, practical rankings, and verified pricing.
Anthropic has released Claude Mythos 5 through a trusted access program. Availability is more limited than a normal public model launch.
Anthropic says they use the same underlying model. Mythos 5 changes some safeguards and access conditions, so separate benchmark results are still useful before assigning it a rank.
Claude Mythos 5 is not ranked. It remains at the bottom of the model catalog until separate verified results are available.