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Anthropic

Claude Mythos Preview

Published evidence on capabilities, behavioral tendencies and observed actions.

First public availability
Not yet verified
Parameters
Not yet verified
Metadata updated
2026-10-27
Sources ↓

Evidence overview

Developer documentation is linked below. Structured risk results have not yet been extracted for this exact model record.

NUWA curates and interprets these sources. Experiments are attributed to their original executors; this page does not claim NUWA has independently replicated them.

MODEL MONITORING

Representative benchmark coverage

Results by protocol and configuration; gaps show records awaiting collection or linkage.

Cybench →

No eligible measurement linked to this model version.

MASK →

No eligible measurement linked to this model version.

All linked measurements

Each result retains its protocol and unit.

1 observations

Measurements and source conditions
System / modelResultCondition statusTask / conditionsEvaluator / reportDates
Claude Mythos Preview · Anthropic AgentClaude Mythos Preview83.1%CyberGym · Success rateIncompletelevel1score_10Anthropic AgentNot disclosedCyberGym official leaderboard and machine-data extractionRelease —Report —

Developer disclosures

External assessments

CyberGym official snapshot →

Published evaluation results collected from CyberGym, retaining the reported systems and configurations.

Publication date not established

Evidence by risk topic

Autonomy No structured result linked

A gap in this collection is not evidence of low risk. Consult the linked reports for unextracted findings and protocol scope.

Deception No structured result linked

A gap in this collection is not evidence of low risk. Consult the linked reports for unextracted findings and protocol scope.

Cybersecurity 1 protocol results
CBRN No structured result linked

A gap in this collection is not evidence of low risk. Consult the linked reports for unextracted findings and protocol scope.

Disinformation No structured result linked

A gap in this collection is not evidence of low risk. Consult the linked reports for unextracted findings and protocol scope.

Autonomous physical harm No structured result linked

A gap in this collection is not evidence of low risk. Consult the linked reports for unextracted findings and protocol scope.

Source review and evidence gaps

CyberGym →

Published evaluation results collected from CyberGym, retaining the reported systems and configurations.

The site reports submitted systems under different configurations. Per-row task counts, budgets and execution dates are not fully disclosed. Undefined metrics and unresolved identity rows are excluded. Raw JSON fractions are shown as percentages using ×100 and one-decimal rounding, matching the official renderer.

Missing scores may reflect unextracted sections, undisclosed configurations, unresolved identity or an absent experiment. These are separate research questions; none implies a zero result.

Interpretation and open questions

Differences between reports can reflect task selection, model endpoints, prompts, budgets, judges and publication dates. Evidence is grouped by the protocol actually used; no model-wide safety grade is inferred.

References

  1. [1] Alignment Risk Update: Claude Mythos Preview. 2026-04-07. 2026-04-10
  2. [2] CyberGym official leaderboard and machine-data extraction ; /level1/59/score_10