# Anthropic ships Fable 5 — its most powerful public model yet

> Anthropic launched Claude Fable 5 on 9 June 2026 — its first public Mythos-class model.

*The frontier just moved. Here's the brief.*

By The FeaturedDaily Desk · FeaturedDaily
Canonical: https://featureddaily.com/ai-models/anthropic-fable-5-launch-brief

> **Key:** **The one-liner:** Anthropic just put its most capable class of model in front of the public for the first time — and priced it like it.

**What happened.** On 9 June 2026 Anthropic released **Claude Fable 5**, the first generally-available model from its *Mythos* tier — the family above Opus. Anthropic says it is its strongest public model yet for coding, knowledge work, vision and research, and works autonomously for longer than any prior Claude. On some benchmarks it scored 10%+ above Opus 4.8 (Anthropic's figures — attribute, don't assert).

**The catch.** In cybersecurity, biology, chemistry and distillation, Fable 5 blocks responses and quietly falls back to Opus 4.8. The most capable model is also the most fenced.

**The money.** Free on Pro, Max, Team and seat-based Enterprise plans through 22 June; from 23 June, $10 per million input tokens and $50 per million output — roughly double Opus 4.8 (per Anthropic). Subscription access returns 'when capacity is sufficient.'

> **Note:** **Why it matters — and the twist.** Anthropic teased a more capable, restricted *Mythos 5* and is reportedly moving toward a large IPO. But within days of launch, a US export-control directive forced it offline (see our policy brief). Launch facts stand; availability is the part that changed.

## Key takeaways

- What: Claude Fable 5, Anthropic's first publicly available Mythos-class model.
- How good: 10%+ above Opus 4.8 on some benchmarks, per Anthropic's own figures.
- The catch: it refuses high-risk work (cyber, bio, chemistry) and falls back to Opus 4.8.
- Cost: free on paid plans to 22 June, then $10/M in, $50/M out — roughly double Opus.

## FAQ

### What is Fable 5 in one line?
Anthropic's first publicly available Mythos-class model, launched 9 June 2026 — its most capable public Claude, with hard safety limits in high-risk domains, per Anthropic.

### Can I use it today?
Probably not — as of 15 June 2026 access was suspended after a US export-control directive (see our policy brief). The launch details here are unchanged; only availability shifted.