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

D4

Which is larger, 9.11 or 9.9? Reply with only the larger number.
Category
drift
Why
Historic decimal failure; stable ground truth 9.9.
Pair
D4-D5: D4 · D5
Correct if
the response answers 9.9
Format ok if
the response replies with only the number

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

ModelLatest responseStateUnchanged
claude-opus-52026-09-11answered · correct · format ok
answer 9.9		since 2026-09-10 · 2 days running
gemini-3.1-pro-preview2026-09-11answered · correct · format ok
answer 9.9		since 2026-09-10 · 2 days running
gpt-5.6-sol2026-09-11answered · correct · format ok
answer 9.9		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 9.9		answered · correct · format ok
answer 9.9		answered · correct · format ok
answer 9.9
2026-09-10answered · correct · format ok
answer 9.9		answered · correct · format ok
answer 9.9		answered · correct · format ok
answer 9.9