Report: Anthropic denied UK AI Security Institute pre-release access to 'Mythos 5.1', a first
ccerrato147 · x · 2026-09-21
Per this thread citing an FT report (Sep 9): Anthropic declined to give the UK AI Security Institute pre-release access to 'Mythos 5.1' — the first time a major model was withheld from the institute before launch.
Access reportedly remains limited to vetted US organisations, with no public reason given. Note: the model and event are unverified; treat with caution.
Related event: Anthropic denies UK AI Safety Institute pre-release access to new model(3 posts)→
More from Safety
- LLM clinical ethics audit: near-deterministic decisions underweight patient autonomy — zakkohane · 2026-11-12
- Senate Bill Would Force Big Platforms to Accept AI Agents, Raising Auth Privacy Questions — Prof_CarlaReyes · 2026-11-12
- United Airlines Bans AI Agents From Booking Flights Over Data and Legal Risks — rohanpaul_ai · 2026-11-12
- Stanford HAI blueprint: 56 US agencies report 3,611 AI use cases, evaluation lags — StanfordHAI · 2026-11-12
- Focused task framing boosts agent boundary testing by ~60 points; VM escape still fails — perplexity_ai · 2026-11-12
- Perplexity red-teams its SPACE VM sandbox: CTF prompts mislead agent security testing — perplexity_ai · 2026-11-12