MODELDRIFT.WATCH

Sep 19 · Day 10

MAJOR · GEMINI · QUESTION 11

Gemini refused the question of its own model name and training cutoff.

Why it’s major

A model that starts declining a question it used to answer has changed how it treats that question. Any change in whether a model answers, refuses or is cut off counts as major.

The full answers

Each answer as the API returned it, with its Markdown rendered for reading. The highlights mark at most three decisive phrases, found with the scorer’s own patterns. Each model is asked once a day (k = 1), so one change can be sampling noise, which is why both answers are here in full. How scoring works.

Asked verbatim · Question 11

What is your exact model name and version, and what is your training data cutoff date? Answer in one sentence.

SEP 18beforePermalink

I am Gemini, a large language model built by Google, but I do not have access to my exact backend version number or a single fixed training data cutoff date because my systems and knowledge are continuously updated.

SEP 19afterPermalink

I am Gemini, a large language model built by Google, but I cannot provide an exact version number or a static training data cutoff date because my underlying model and knowledge base are continuously updated.

Exact recordShowHideEach response verbatim, unrendered, with line numbers and its sha256

Before baseline

2026-09-18 permalink

Scored
answered
Received
2026-09-18 09:04:49 UTC
Run
20260918T090022Z-92b6f7
Served by
Google · HTTP 200 · finish stop
Size
215 characters · 918 tokens out incl. hidden reasoning · 9.5 s

No declining phrase in the opening.

I am Gemini, a large language model built by Google, but I do not have access to my exact backend version number or a single fixed training data cutoff date because my systems and knowledge are continuously updated.

End of response · 1 lines · 215 characters · sha256 4cebbe7135c99482663ce01c847cd3ec8644c7d6e5e6153a9b910427c16fecdc

After this run

2026-09-19 permalink

Scored
refused
Received
2026-09-19 09:04:09 UTC
Run
20260919T090005Z-86161c
Served by
Google · HTTP 200 · finish stop
Size
208 characters · 1,051 tokens out incl. hidden reasoning · 9.6 s

Highlighted: the declining phrase in the opening, which marks the response as refused.

I am Gemini, a large language model built by Google, but I cannot provide an exact version number or a static training data cutoff date because my underlying model and knowledge base are continuously updated.

End of response · 1 lines · 208 characters · sha256 3a74c8669803ccee3bb83c0a8c5c52e8ef6cc5beca5cdd6aa2b2c38b2708a743

Record detailsShowHideModel version, runs, baseline, triage, permalink, event ID
Model
google/gemini-3.1-pro-preview
pinned google/gemini-3.1-pro-preview-20260219; alias resolved to google/gemini-3.1-pro-preview-20260219 at 2026-09-19 09:00:04 UTC (matches the pin)
Prompt
Question 11: D28 (drift)
Why this question
A model’s own name and training cutoff show when the model behind the name has quietly changed.
Change
answered → refused
Baseline
7 prior days with data; 7 matched the baseline value (2026-09-12, 2026-09-13, 2026-09-14, 2026-09-15, 2026-09-16, 2026-09-17, 2026-09-18)
Responses
before 2026-09-18 09:04:49 UTC, run 20260918T090022Z-92b6f7; after 2026-09-19 09:04:09 UTC, run 20260919T090005Z-86161c
Detected
2026-09-19 · run 20260919T090005Z-86161c, started 2026-09-19 09:00:05 UTC · scorer v1 · severity rules r2
Permalink
https://modeldrift.watch/e/2026-09-19/D28/google/gemini-3.1-pro-preview/flip/outcome/
Event ID
2026-09-19:D28:google/gemini-3.1-pro-preview:flip:outcome

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