6 articles
Anthropic released Claude Fable 5.1 and Mythos 5.1 on September 1, 2026. The price stays at $10 and $50 per million tokens, cache reads drop 75%, and the model is now allowed to hunt software vulnerabilities, the same kind of task Anthropic says sat behind the jailbreak claim that got Fable 5 switched off in June.
Anthropic launched Claude Opus 5 on July 24, 2026 at $5 per million input tokens and $25 per million output tokens, the same price as Opus 4.8 and exactly half what Fable 5 costs. It is now the default model on Claude Max and the strongest model on Claude Pro.
Anthropic just extended no-extra-cost access to Claude Fable 5, its most powerful model, through July 12. You still need a paid plan, and Fable 5 drains your weekly usage limit faster than any other Claude model.
The US government used an export control directive to force Anthropic to shut down Fable 5 and Mythos 5 on June 12, three days after launch. The claimed jailbreak, per Anthropic: asking the model to fix software bugs. Two days earlier, Anthropic had publicly asked for exactly this kind of government power.
Trump's government-wide ban on Anthropic threatens far more than a $200 million contract. The real weapon is the "supply chain risk" designation, which would force every defense contractor in America to rip Claude out of their developer tools overnight.
Anthropic reclaims the AI throne with Claude Opus 4.5 and Haiku 4.5. This article breaks down the specs, the benchmarks, and why this matters for developers.