#frontier models

The US Department of Commerce has lifted export controls on Anthropic's advanced AI models Claude Fable 5 and Mythos 5, but Fable 5 now has new restrictions that block its cybersecurity and coding capabilities. This policy change affects the availability of frontier AI models, raising concerns about business reliance on US AI companies and the unpredictability of regulation. Fable 5 now uses classifiers to block cybersecurity tasks, causing routine coding and debugging to fall back to Opus 4.8. Mythos 5, designed for vulnerability detection, remains available to select businesses and cybersecurity experts.

Fernando Irarrázaval's OpenClaw AI assistant challenge, where 2,000 people attempted to leak secrets via email, ended with zero successful breaches after 6,000 attempts. The underlying model, Anthropic's Opus 4.6, was protected by anti-prompt-injection rules. This experiment provides real-world evidence that frontier models are becoming significantly more robust against prompt injection attacks, a critical AI safety concern. It suggests that security improvements in large language models are translating into practical defenses, though not guaranteeing complete invulnerability. The challenge cost $500 in tokens and triggered a Google account suspension due to excessive inbound emails. Despite 6,000 attempts, no participant managed to leak the secret, but the author warns against deploying production systems where prompt injection could cause irreversible damage.