OpenAI researcher: Fable 5.1 and Mythos 5.1 are far less monitorable than Astra
tomekkorbak · x · 2026-09-16
OpenAI researcher tomekkorbak argues that, based on public information, Fable 5.1 and Mythos 5.1 appear significantly less monitorable than Astra. He notes there is no head-to-head comparison he is aware of; the closest is the CoT controllability evals in the respective system cards. Comment came in response to Anthropic's assessment of its cybersecurity eval incidents.
Related event: OpenAI researcher says Fable 5.1 far less monitorable than Astra(4 posts)→
More from Models
- Open-source VoxLock tops Krisp voice isolation benchmark with 4.95% WER — Arbaz Siddiqui · 2026-11-02
- Anthropic's 85% inference margin sparks debate on open source's price-pressuring role — code_star · 2026-11-02
- User reports xAI appears to have quietly raised weekly usage limits, dropping his meter from 93% to 47% — XFreeze · 2026-11-02
- Meituan's LongCat-2.5 lands as 1.6T MoE agent model, with DeepSeek copycat speculation — teortaxesTex · 2026-11-02
- Asked what AI firms want you to stop owning, Claude said: your own compute — alex_verem · 2026-11-02
- Is Hermes Still Worth It? Codex's $200 Tier Now Overlaps Most of Its Value — Foreign_Lead_3582 · 2026-11-02