Technology
Anthropic Launches Claude Fable 5, a New Tier Above Opus
Anthropic's Claude Fable 5 debuts a new Mythos class above Opus, pairing frontier capability with automatic safety routing for risky queries.
Jun 9, 2026
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8 stories for“claude fable 5”
Technology
How Claude Fable 5 Got Pulled, Then Came Back Three Weeks Later
A jailbreak report and a same-day export order took Claude Fable 5 offline for weeks, testing how fast a frontier AI company can lose and regain access.
Jul 1, 2026
Technology
Claude Opus 5.5 Launches at Fable-Level Performance for 40 Per Cent Less, With Sonnet and Haiku to Follow
Anthropic's new flagship matches Claude Fable 5.1 on most work at a fifth of the delay and a fifth less cost per token, and beats it outright on agentic coding, computer use and chart reading. Input is 4 dollars, output 20, a fifth cheaper than Opus 5.
Sep 24, 2026
Technology
Claude Mythos 5: The Same Model, Minus the Guardrails
Claude Mythos 5 strips Fable 5's safety classifiers for vetted users only, forcing a fresh argument over who gets to use AI without a leash.
Jul 8, 2026
Technology
GPT-6 Astra Is Real: OpenAI's First 'Critical' Cybersecurity Model, and Testers Say It Is Not the Best All-Rounder
Released 3 September, Astra found genuine security flaws in testing and posted OpenAI's best-ever reasoning scores, but Artificial Analysis still ranks Claude Fable 5.1 ahead of it on broad intelligence and coding. Pricing matches Fable at 10 and 50 dollars.
Sep 24, 2026
Technology
Anthropic Shipped the Same Model Twice Under Two Names, and the Difference Is Who Is Allowed to Use It
Fable 5.1 and Mythos 5.1 are the same model with different safeguards. One is generally available. The other is restricted to a set of American organisations through trusted access programmes, for work in cybersecurity and the life sciences.
Sep 1, 2026
Technology
Claude Opus 5 Makes the Case Against Frontier Pricing
Anthropic priced its newest model exactly where the previous one sat, then claimed near-flagship results. The pitch is aimed squarely at the mid-difficulty work that fills enterprise queues.
Aug 3, 2026
Technology
Claude Opus 5 Arrives With a Clear Pitch: Frontier-Level Work at a Usable Price
Anthropic's new Opus model targets long-running coding and professional workflows with a 1-million-token context window, adaptive effort and the same API price as Opus 4.8.
Jul 24, 2026
