Fable 5

Anthropic has released Claude Opus 5, upgrading from Opus 4.8, with pricing held at $5 per million input tokens and $25 per million output tokens. The company claims the model approaches the intelligence of its flagship Fable 5 model at half the cost.

Sakana AI has released Fugu Ultra v1.1, an update to its multi-model router, claiming performance gains up to 7.9 points over v1.0 and results that beat Anthropic's Fable 5 despite Fable 5 not being part of the router's model pool. All benchmark figures come from Sakana itself and remain unverified.

Moonshot AI released Kimi K3 on July 16, 2026, featuring 2.7 trillion parameters—the largest open-weight model to date. The company claims K3 performs competitively with Anthropic's Fable 5 while costing $15 per million output tokens compared to Fable's $50.

The U.S. Commerce Department has cleared Anthropic to restore access to its Mythos 5 AI model for select cybersecurity partners, two weeks after imposing export controls over jailbreak concerns. The related Fable 5 model remains under government restrictions.

The Trump administration is close to allowing Anthropic to restore access to its Fable 5 model, which has been offline for 15 days due to national security concerns. Insiders expect restrictions could be lifted as soon as next week, though Pentagon and NSA approval is still required.

Anthropic has released Claude Fable 5, described as a 'Mythos-class' model that the company claims is safe for general use. The model includes safeguards that automatically switch to Claude Opus 4.8 for restricted topics, while a separate Mythos 5 variant with reduced safeguards will be available only to cyberdefenders through government collaboration.