On June 25, 2026, Anthropic denied reports that its halted high-end model "Claude Fable 5" had returned, stating that traffic to Fable 5 is currently "exactly zero." Staff said that any appearance of the model in the UI may be a bug and is under investigation.
June 25, 2026 · Anthropic
Claude Fable 5: the most capable model — still serving zero traffic
Released June 9 as Anthropic's top-tier "Mythos-class" model, Fable 5 was suspended worldwide just three days later under a U.S. export-control directive. Two weeks on, it remains officially unavailable — no resumption timeline given.
3 days
from release (Jun 9) to global suspension (Jun 12)
0
traffic served as of Jun 25 — access reports likely UI bugs
1M
token input context, up to 128K output
Output price vs prior tiers
Per 1M output tokens — roughly double Opus 4.8, but under half of Mythos Preview.
Input: $10 / 1M tokens · no extra charge for long context.
Released
Jun 9 — "most capable broadly available model," SOTA-class on coding, reasoning, vision & science.
→
Jailbreak found
Narrow technique prompting fixes to codebase vulnerabilities flagged as national-security concern.
→
Jun 12 — Suspended
U.S. export-control directive cuts access for all users worldwide. Still offline.
PRAISE
Called a "beast" — complex coding done at high quality within hours
Strong self-verification & long-running autonomy
Advantage on long-term, multi-day projects
New records on some previously unsolved tasks
CONCERNS
High cost and slow speed
Over-strict guardrails → frequent cyber-query refusals falling back to Opus 4.8
Frequent timeouts in benchmark runs
Enterprise unease over 30-day data retention
The most capable model on paper — yet inaccessible in practice. Anthropic disputes the government's response and notes comparable capabilities exist in rival models, but with no official timeline for resumption, developers continue to wait.
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