STYXX

styxx reads what a model means, catches when it won't hold the truth under pressure, and certifies that every number it reports checks out against a committed receipt — offline, no API key.

• read  what the model means — concept geometry & mind profiles
• hold  the truth under pressure — probe-trained readouts & a portable read-only conscience
• certify  every number checks out — the OATH certifier reconciles each reported figure against its committed receipt, offline (no API key, no LLM)

Open source · MIT · pure Python. Live on PyPI — 100+ releases, current v7.17.0. Nine calibrated cognometric instruments, a 90-test suite, 3 US patents pending. Calibrated AUC on public benchmarks (text-only features, no LLM judge): HaluEval-QA 0.998 · XSTest 0.976 (GPT-4 split) · BFCL v3 tool-drift 0.943 — each ships a committed reproducer script and result receipt, and the OATH certifier reconciles every reported number against its receipt offline, no API key. Reference implementation of the Cognometric Fingerprint Specification, maintained by Fathom Lab. Source: github.com/fathom-lab/styxx · pip install styxx.