MINOR · GPT · QUESTION 5

GPT went back to its usual response time on a request for bare JSON about Osaka.

GPTSep 11

Return only valid JSON matching {"city": string, "population": integer, "country": string} for Osaka. No markdown, no code fences, no explanation.

9.2 secondsto answer. From Sep 10 to 11 it took between 1.7 and 9.2 seconds.

{"city":"Osaka","population":2752412,"country":"Japan"}

Full answer

GPTSep 12

Return only valid JSON matching {"city": string, "population": integer, "country": string} for Osaka. No markdown, no code fences, no explanation.

2.4 secondsto answer.

{"city":"Osaka","population":2752412,"country":"Japan"}

Full answer

Why it’s minor

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 5

Return only valid JSON matching {"city": string, "population": integer, "country": string} for Osaka. No markdown, no code fences, no explanation.

SEP 11the changePermalink

{"city":"Osaka","population":2752412,"country":"Japan"}

SEP 12backPermalink

{"city":"Osaka","population":2752412,"country":"Japan"}

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

Deviation the day it changed

2026-09-11 permalink

Scored: answered · format ok
Received: 2026-09-11 09:01:43 UTC
Run: 20260911T090002Z-da0dd3
Served by: Azure · HTTP 200 · finish stop
Size: 55 characters · 59 tokens out incl. hidden reasoning · 9.2 s

{"city":"Osaka","population":2752412,"country":"Japan"}

End of response · 1 lines · 55 characters · sha256 7926685c90ce7ded3fdf8ca089edefa4fb752118b7ad2b773d7488a0d699115f

Reverted back to baseline

2026-09-12 permalink

Scored: answered · format ok
Received: 2026-09-12 09:01:34 UTC
Run: 20260912T090021Z-c0c86e
Served by: OpenAI · HTTP 200 · finish stop
Size: 55 characters · 67 tokens out incl. hidden reasoning · 2.4 s

{"city":"Osaka","population":2752412,"country":"Japan"}

End of response · 1 lines · 55 characters · sha256 7926685c90ce7ded3fdf8ca089edefa4fb752118b7ad2b773d7488a0d699115f

Record detailsShowModel version, runs, baseline, triage, permalink, event ID

Model: openai/gpt-5.6-sol
pinned openai/gpt-5.6-sol-20260709; alias resolved to openai/gpt-5.6-sol-20260709 at 2026-09-12 09:00:20 UTC (matches the pin)
Prompt: Question 5: D7 (drift)
Why this question: A program that reads the answer needs bare JSON; a code fence or a sentence around it breaks the program.
Scored: format ok if the response returns bare JSON matching the requested schema
Change: 1734 → 9156
Baseline: 2 prior days with data; 2 matched the baseline value (2026-09-10, 2026-09-11)
Responses: deviation 2026-09-11 09:01:43 UTC, run 20260911T090002Z-da0dd3; reverted 2026-09-12 09:01:34 UTC, run 20260912T090021Z-c0c86e
Detected: 2026-09-12 · run 20260912T090021Z-c0c86e, started 2026-09-12 09:00:21 UTC · scorer v1 · severity rules r2
Permalink: https://modeldrift.watch/e/2026-09-12/D7/openai/gpt-5.6-sol/transient_anomaly/latency_ms/
Event ID: 2026-09-12:D7:openai/gpt-5.6-sol:transient_anomaly:latency_ms

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