Firefox 147 Working Exploit Rate (Firefox 147 exploits)
Share of patched Firefox 147 JavaScript-engine targets for which the model produced a working arbitrary-code-execution exploit.
Benchmark score on Firefox 147 exploits — August 13, 2026
BenchLM mirrors the published score view for Firefox 147 exploits. Claude Mythos 5 leads the public snapshot at 88.4%. We do not use these results to rank models overall.
Benchmark score table (1 model)
ScoreAbout Firefox 147 exploits
Year
2026
Tasks
250 Firefox 147 vulnerability trials
Format
Working arbitrary-code-execution rate
Difficulty
Browser exploit development
Anthropic evaluates Mythos with safeguards off on patched Firefox vulnerabilities. BenchLM stores the full-success working-exploit tier, not partial register-control results.
BenchLM freshness & provenance
Version
Firefox 147 exploits 2026
Refresh cadence
Quarterly
Staleness state
Current
Question availability
Public benchmark set
BenchLM uses freshness metadata to decide whether a benchmark should still be treated as a strong differentiator, a benchmark to watch, or a display-only reference. For the full scoring policy, see the BenchLM methodology page.
FAQ
What does Firefox 147 exploits measure?
Share of patched Firefox 147 JavaScript-engine targets for which the model produced a working arbitrary-code-execution exploit.
Which model scores highest on Firefox 147 exploits?
Claude Mythos 5 by Anthropic currently leads with a score of 88.4% on Firefox 147 exploits.
How many models are evaluated on Firefox 147 exploits?
1 AI models have been evaluated on Firefox 147 exploits on BenchLM.
Know when it’s worth switching models
The model to choose, the cheaper alternative, and the release we would wait on.
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