🚀 New Video: Anthropic Just Dropped Fable 5 (Their Most Capable Model Ever)

Jun 10 • Youtube

Anthropic shipped its most capable model today. The part nobody's saying out loud: the version you and I get isn't technically the full model. It's the same brain with a leash on it. Mostly that doesn't matter — here's the real breakdown.

Fable 5 and Mythos 5 are the same model. Same weights, same capability. The only difference is safeguards. Mythos 5 (raw, cyber guardrails lifted) stays locked to government cyber partners via Project Glass Wing. Fable 5 is the public, safe version — and for 95%+ of sessions you're driving the full thing. The leash only pulls on cyber, bio/chem, or trying to copy the model.
It's a coding + agent release first. SWE Pro: Fable 80.3% vs Opus 4.8 at 69.2% and GPT 5.5 at 58.6%. Stripe migrated a 50M-line Ruby codebase in a day (manual estimate: 2+ months). It beat Pokémon Fire Red from raw screenshots alone. The longer and gnarlier the task, the bigger the lead.
Price: $10 in / $50 out per million. Roughly double Opus, priciest flagship on paper. But the old Mythos preview was $25/$125 — so you're getting a stronger model for less than half. Don't run cheap high-volume jobs on it; reach for it when the task is hard enough that one good run beats five cheap failures.
One behavior to know. Hit a guarded topic and the answer quietly falls back to Opus 4.8 (they disclose it). Filters are tuned cautious, so they sometimes flag harmless stuff. If a normal reply feels a notch less sharp, that's why — not a bug.
There's a clock. Free on Pro, Max, Team, and Enterprise through June 22. Metered on usage credits from June 23. ~2 weeks to test it free.

My take: spend the next two weeks finding the 2-3 jobs where Fable clearly beats Opus, then only pay for those after the 23rd. Don't dump your whole workload on it out of hype.

📎 Full Fable 5 guide PDF pinned below — the benchmarks, the full pricing table, the API swap, and the rollout dates.

This is exactly the kind of release we break down inside The AI Accelerator (free, 19k+ members). Come compare notes on what's actually worth running on it.

👉 What's the first hard job you'd point Fable 5 at? Drop it in the comments.

[Watch the video here ▶️]

6 comments

🚀 New Video: Anthropic Just Dropped Fable 5 (Their Most Capable Model Ever)