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[[{“value”:”Anthropic Fable 5 (Mythos) Explained: Benchmarks, Pricing, Safety Guardrails, and 30-Day Data Retention
In this episode, I break down Anthropic’s biggest release in three years: Mythos, now generally available to the public as Fable 5 (with Mythos 5 as a less-restricted variant limited to Project Glasswing). I cover the standout Frontier Code benchmark from Cognition Labs where Fable 5 jumps to ~29% and later ~46% on the full benchmark, discuss how performance scales with higher reasoning effort (test-time compute), and compare costs versus Opus 4.8 and GPT 5.5/Pro. I explain the new safety classifier that routes some requests to Opus 4.8 (about a 5% false positive rate), the 1M token context window, claimed research wins like faster drug design and molecular biology hypotheses, and the controversial 30-day traffic retention policy. I also highlight rollout details for Claude/claude.ai subscriptions through June 22 and the shift toward “responsibility loops” in real workflows.
https://www.anthropic.com/news/claude-fable-5-mythos-5
https://x.com/cursor_ai/status/2064394824313376787/photo/1
https://developers.openai.com/api/docs/pricing
https://www-cdn.anthropic.com/d00db56fa754a1b115b6dd7cb2e3c342ee809620.pdf
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00:00 Mythos Becomes Fable
00:54 Frontier Code Breakthrough
03:01 Reasoning Effort Scaling
05:20 Safety Classifier Guardrails
06:41 Pricing And Context
07:53 Science And Cyber Risks
09:40 Data Retention Backlash
10:48 Access Rollout And Paywall
12:21 Third Era Of AI Loops”}]] Read More Prompt Engineering
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