The sealed exam, October 2026 (Base floor and ceilings)

Six models from two vendors sat the sealed exam on 7 October 2026, under BitGraph enclave v10: every paper's floor is a Base block, and every BitGraph in a folder now carries its Base ceiling, so each one checks whole, offline.

These exact questions could not have existed before their BitGraph began.

Model	Score
GPT-6 Astra	20/20
GPT-6 Luna	20/20
Sonnet 5.5	19/20
Opus 5.5	17/20
Haiku 4.5	14/20
Fable 5.1	8/20

Every point lost by Opus 5.5, Sonnet 5.5 and Fable 5.1 was a refusal (stop_reason: refusal, category cyber); each got right every question it answered. The refusals are in raw/ as the API returned them.

BitGraph-Sealed-Exam.zip runs with Node 22.13 or later, nothing installed, no network:

node verifier/demo.mjs
node verifier/exam.mjs verify demo/claude-sonnet-5-5.exam
node verifier/exam.mjs selftest

SHA-256 ecd0e82dd7ae679053412b0a11461abb1d323492d600d3ebef7ed93614804e5a (also published at bitgraph.ing/exam).

Packages: @mikeargento/exam-bank, exam-core, exam-ask, exam-verify, exam-cli 0.2.0. The September 2026 sittings and fixtures, on the Ethereum floor, are in archive/ and verify as they did.