Claude Fable 5: First AI to BREAK 90% on Agentic Tasks

🔗 Official links from the video:

➡️ Claude Fable 5 & Mythos 5 announcement: https://www.anthropic.com/news/claude-fable-5-mythos-5

➡️ Claude Mythos: https://www.anthropic.com/claude/mythos

In this video, I break down everything Anthropic just announced about Claude Fable 5, the first model in the new Claude 5 family and part of the Mythos-class tier that sits ABOVE Claude Opus. Fable 5 is beating Opus 4.8 almost everywhere, and it's the first model ever to break 90% on complex agentic tasks. I'll walk you through the benchmarks, the even more powerful Claude Mythos 5 model, how to switch to Fable 5 inside Claude Code, and the pricing and token costs you need to know before you start using it.

💡What you'll learn

✅ Why Claude Fable 5 beats Opus 4.8 on agentic coding, tool use, and long-running tasks.

✅ How Fable 5 became the first model ever to break 90% on complex agentic tasks.

✅ What Claude Mythos 5 is and how Project Glasswing fits into the rollout.

✅ How Anthropic made Fable 5 safe for public use by limiting its cybersecurity capabilities.

✅ The exact benchmark numbers for Fable 5, Mythos 5, and Opus 4.8 side by side.

✅ How to update Claude Code and switch to the Fable 5 model with a single slash command.

✅ The full Fable 5 pricing breakdown and why it burns your tokens 2x faster than Opus 4.8.

This breakdown gives you the full picture of Claude Fable 5 and the Mythos-class models in 2026, the benchmarks, the safety story behind the cybersecurity limits, the real pricing per million tokens, and exactly how to start using Fable 5 today. Whether you're building agentic workflows in Claude Code or calling the Claude API directly, you'll know precisely what's changed and how to make the most of it.

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Claude Fable 5: First AI to BREAK 90% on Agentic Tasks