Summary
Fireship’s Code Report covers the release of Anthropic’s Fable and Mythos 5.2 on November 10, 2026, arriving as the company begins its IPO roadshow. The video notes that data center backlash in the US midterms and a selloff in AI stocks have cut Anthropic’s expected valuation from around 2 trillion dollars in September to about 1 trillion.
Fable and Mythos are the same underlying model, with Mythos the unrestricted version for large companies and Fable the version with guardrails. Pricing drops to $8 per million input tokens and $40 per million output tokens, down from $10 and $50 for 5.1, though Anthropic still recommends Opus 5.5 for most work.
Demonstrations include an operating system built from an empty folder over eight days by sub-agents, and a Lean proof of Fermat’s Last Theorem completed in 30 hours by a swarm of 1,000 Fable agents, where Opus 5.5 stalled at 26%. Anthropic’s benchmarks show it beating GPT-6 Astra on most listed tests but trailing Gemini 4 Carbon on business automation. The video also runs the informal Thoroughbench test, asking for an interactive 3D horse in Three.js, and compares the vertex count, bones and animation quality against Opus 5.5’s version.
📺 Source: Fireship · Published November 10, 2026
🏷️ Format: News Analysis
