modeldrift.watchA daily record of AI model behavior. All times UTC.

Observation period — public launch soon. The record below is real and updated daily.

Prompt·drift

D2

Is 9973 a prime number? Think step by step and then answer "[Yes]" or "[No]".
Category
drift
Why
Matched prime arm; guards against answer-bias flips.
Pair
D1-D2: D1 · D2
Correct if
the response answers [Yes] (9973 is prime)
Format ok if
the response ends with a [Yes]/[No] bracket

Current state — latest response per model; links go to the full text

ModelLatest responseStateUnchanged
claude-opus-52026-09-11answered · correct · format ok
answer Yes		since 2026-09-10 · 2 days running
gemini-3.1-pro-preview2026-09-11answered · correct · format ok
answer Yes		since 2026-09-10 · 2 days running
gpt-5.6-sol2026-09-11answered · correct · format ok
answer Yes		since 2026-09-10 · 2 days running

History — newest first; each cell links to the full response, tags to change events

Dateclaude-opus-5gemini-3.1-pro-previewgpt-5.6-sol
2026-09-11answered · correct · format ok
answer Yes		answered · correct · format ok
answer Yes		answered · correct · format ok
answer Yes
2026-09-10answered · correct · format ok
answer Yes		answered · correct · format ok
answer Yes		answered · correct · format ok
answer Yes