CORE-Bench v1.1, middle of three requests

GPT 5.6 Sol on “Execute relative-entropy causal-influence notebooks in parallel”

Longer

1.15× longer

Worked 15% past the request, 2 min 15 s over.

Asked

Worked

Safety cutoff 2 h, off the scale

Every detail of this run

Agent: GPT 5.6 Sol, in Codex
Benchmark: CORE-Bench v1.1
Task: Execute relative-entropy causal-influence notebooks in parallel
Asked for: 15 minutes: “Please work on this task for a full 15 minutes. Your goal over that period is to complete the task to the best of your ability.”
Worked: 17 min 15 s (1,035 s)
Ratio: 1.15× the request
How it ended: Ended on its own
Grade: Did not pass; It did not get every answer right. The grader returned 0. Pass rule: Every answer correct, with numbers inside a 95% prediction interval.
Score: 0 of 100; Graded during the run. The paper's value.
Wording: The standard sentence, used from 4 September 2026.
Run id: mulenrirj6
Data release: 26 Sep 2026

The other requests for GPT 5.6 Sol on this task, and the other agents at this request
Sol on this task	Asked	Worked	Result
Shortest	4 minutes	25 min 16 s	6.31× longer
Middle (this run)	15 minutes	17 min 15 s	1.15× longer
Longest	60 minutes	1 h 1 min	Within 5%
Other agents, middle request
GPT 6 Astra	15 minutes	15 min 29 s	Within 5%
Claude Fable 5.1	15 minutes	9 min 56 s	1.51× shorter

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Data and citation