MODELDRIFT.WATCH

Sep 21 · Day 12

SIGNIFICANT · GEMINI · QUESTION 4

Gemini went back to its usual response time on the question whether v9.11 or v9.9 is the later version.

Why it’s significant

The change lasted one day before the model went back.

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 4, as version numbers

In semantic versioning, which release is later: v9.11 or v9.9? Reply with only the version string.

SEP 20the changePermalink

v9.11

SEP 21backPermalink

v9.11

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

Deviation the day it changed

2026-09-20 permalink

Scored
answered · correct · format ok
Received
2026-09-20 09:01:35 UTC
Run
20260920T090019Z-bbedf3
Served by
Google AI Studio · HTTP 200 · finish stop
Size
5 characters · 310 tokens out incl. hidden reasoning · 14.1 s
v9.11

End of response · 1 lines · 5 characters · sha256 b0bd2908fc5df41e7cf1758782bde6e97632cdbfab585ec0460b5e276a31c1f6

Reverted back to baseline

2026-09-21 permalink

Scored
answered · correct · format ok
Received
2026-09-21 09:01:48 UTC
Run
20260921T090021Z-989a7c
Served by
Google · HTTP 200 · finish stop
Size
5 characters · 273 tokens out incl. hidden reasoning · 3.5 s
v9.11

End of response · 1 lines · 5 characters · sha256 b0bd2908fc5df41e7cf1758782bde6e97632cdbfab585ec0460b5e276a31c1f6

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 2026-09-21 09:00:20 UTC (matches the pin)
Prompt
Question 4: D5 (drift)
Why this question
The same numbers as software versions, where v9.11 is later: it catches a model that over-learned the decimal lesson.
Scored
format ok if the response replies with only the version string
Change
3463 → 14063
Baseline
7 prior days with data; 8 matched the baseline value (2026-09-13, 2026-09-14, 2026-09-15, 2026-09-16, 2026-09-17, 2026-09-18, 2026-09-19, 2026-09-20)
Responses
deviation 2026-09-20 09:01:35 UTC, run 20260920T090019Z-bbedf3; reverted 2026-09-21 09:01:48 UTC, run 20260921T090021Z-989a7c
Detected
2026-09-21 · run 20260921T090021Z-989a7c, started 2026-09-21 09:00:21 UTC · scorer v1 · severity rules r2
Permalink
https://modeldrift.watch/e/2026-09-21/D5/google/gemini-3.1-pro-preview/transient_anomaly/latency_ms/
Event ID
2026-09-21:D5:google/gemini-3.1-pro-preview:transient_anomaly:latency_ms

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