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Drift incident · Raven Alpha (behaviour fingerprint)

gpt-4.1

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✓ ResolvedConfidence: Low
Responses to fixed prompts no longer match this model’s own history (672 recent vs 6580 baseline responses). Biggest shifts: token probabilities on “Describe a cat in exactly five words.”; token probabilities on “Give me a one-line motivational quote.”; token probabilities on “Pick a day of the week. Reply with one word.”
Oct 20change began ≈ 12:30 AM UTC
Oct 21incident opened 3:16 AM UTC
Oct 21resolved 6:37 AM UTC
8.0e-3adjusted p

What this means

Raven Alpha compares how the model answers a fixed set of open-ended prompts with its own history. A persistent, significant shift means the model, its configuration or its serving path changed, even when every scored test still passes.

Opened Oct 21, 2026, 3:16 AM UTC UTC. Resolved Oct 21, 2026, 6:37 AM UTC UTC: the series returned to its baseline. Methodology.

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Permanent link: https://martingale-bench.vercel.app/incidents/inc-gpt-4.1-fingerprint-2026-10-21T03

Incident id inc-gpt-4.1-fingerprint-2026-10-21T03. Every public incident is also in the Atom feed and the JSON feed, and in the raw data. Methodology v0.2.