The U.S. Commerce Department ordered Anthropic to take its Claude Fable 5 and Mythos 5 AI models offline on June 9, citing a claimed jailbreak that allows foreign nationals to exploit code vulnerabili…
Anthropic launched Claude Fable 5, its first Mythos-class AI model, on June 9, achieving an 80% score on SWE-Bench Pro but facing criticism for generating dense, jargon-heavy reasoning that even its c…
Anthropic released Claude Fable 5, its new best publicly available model, alongside a 319-page system card detailing safety restrictions and performance trade-offs. The model introduces additional saf…
An open benchmark for code vulnerability scanners shows that LLM-based tools outperform rule-based systems on semantic flaws like SQL injection and command injection, while rule-based tools remain com…
Anthropic faced backlash after its June 10, 2026 launch of Claude Fable 5 and Mythos 5, when users discovered the AI models silently rerouted sensitive queries to an older, less capable model. The com…
Anthropic has introduced a two-tier model strategy with Mythos 5 and Fable 5, both running the same Claude 5 base model but with different safety guardrails. Fable 5, available to general API users an…
AWS Bedrock customers using Anthropic's Mythos-class models, including Fable 5 and Mythos 5, must now consent to 30-day data retention by Anthropic for misuse detection, with data leaving AWS's securi…
Anthropic launched Fable 5 / Mythos 5, a model tier for long-horizon asynchronous autonomy, on June 10, 2026, marking the arrival of the async-agent era. The release reframes AI competition around aut…
Anthropic released two Mythos-class AI models on Tuesday, including Fable 5 for general use and Mythos 5 with lifted safeguards for select cyberdefenders, both priced at half the cost of the Mythos pr…
Anthropic released Claude Fable 5 on Tuesday, its first "Mythos-class" model, but restricted its ability to answer queries on cybersecurity, biology, and chemistry to prevent malicious use. The public…
Anthropic released its most capable AI model, Claude Fable 5, after previously hiding it due to safety concerns. The company also released Mythos 5, identical to Fable 5 but with a safeguard that degr…