Descriptions:
Nate Herk delivers a striking demonstration of Claude Fable 5, Anthropic’s newly released “mythos class” model — the first tier above Opus ever made available to paid subscribers. With a single prompt and no further human involvement, Fable 5 autonomously produced the entire video being watched: it read Anthropic’s announcement, fact-checked every claim, wrote a script in Nate’s voice using a transcript-based voice playbook, generated audio via an ElevenLabs voice clone (chunked to prevent voice drift), rendered an avatar through HeyGen’s Avatar 5 model, and stitched everything together with FFmpeg — including GSAP-animated motion graphics built as HTML code and timed to word-level transcription.
Fable 5’s headline benchmarks are substantial: Stripe reported compressing months of engineering work into days, and Anthropic tested it on a 50-million-line Ruby codebase that it migrated in a single day — a task estimated at two months of team effort. It also completed Pokémon Fire Red from raw screenshots without navigation aids, outperforming previous Claude models that required helper harnesses. Pricing is $10 per million input tokens and $50 per million output tokens.
Nate’s full session ran in approximately one hour, consumed around 380,000–400,000 tokens, and cost roughly 40% of a $200/month Max plan. Sub-agents in the verification workflow ran on Sonnet rather than Fable to manage costs. He notes that the pipeline is likely replicable with Sonnet and a well-built Hermes skill set — making this video both a capability showcase for Fable 5 and a practical blueprint for fully autonomous AI video production.
📺 Source: Nate Herk | AI Automation · Published June 12, 2026
🏷️ Format: Showcase
