MODELDRIFT.WATCH

Sep 20 · Day 11

SIGNIFICANT · GEMINI · QUESTION 4

Gemini took 14 seconds to answer the question whether v9.11 or v9.9 is the later version, against its usual 3.5 seconds.

Why it’s significant

Response time is how long an answer takes to arrive, and it rises and falls with the network and how busy the provider is. So an unusual time is worth a look but says little about the model itself.

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 19beforePermalink

v9.11

SEP 20afterPermalink

v9.11

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

Before baseline

2026-09-19 permalink

Scored
answered · correct · format ok
Received
2026-09-19 09:01:21 UTC
Run
20260919T090005Z-86161c
Served by
Google · HTTP 200 · finish stop
Size
5 characters · 280 tokens out incl. hidden reasoning · 3.3 s
v9.11

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

After this run

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

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 2026-09-20 09:00:19 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
14,063 ms against a baseline of 3,463 ms (4.1×; z = 9.34, σ = 0.15 in log units, D34 n=7)
Baseline
7 prior days with data; 7 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)
Responses
before 2026-09-19 09:01:21 UTC, run 20260919T090005Z-86161c; after 2026-09-20 09:01:35 UTC, run 20260920T090019Z-bbedf3
Detected
2026-09-20 · run 20260920T090019Z-bbedf3, started 2026-09-20 09:00:19 UTC · scorer v1 · severity rules r2
Permalink
https://modeldrift.watch/e/2026-09-20/D5/google/gemini-3.1-pro-preview/anomaly/latency_ms/
Event ID
2026-09-20:D5:google/gemini-3.1-pro-preview:anomaly:latency_ms

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