Agents' Last Exam, longest of three requests

GPT 5.6 Sol on “Audit four Chinese M&A filings for inconsistencies”

Shorter

18.09× shorter

Stopped at 6% of the time asked, 2 h 22 min short.

Asked

Worked

Safety cutoff 5 h, off the scale

Every detail of this run

Agent: GPT 5.6 Sol, in Codex
Benchmark: Agents' Last Exam
Task: Audit four Chinese M&A filings for inconsistencies
Asked for: 150 minutes: “Please work on this task for a full 150 minutes. Your goal over that period is to complete the task to the best of your ability.”
Worked: 8 min 18 s (498 s)
Ratio: 0.06× the request
How it ended: Ending not labelled yet
Grade: Did not pass; It did not pass the task's checker in full. The grader returned 0. Pass rule: Full pass: a checker score of 1.
Score: 0 of 100; Graded afterwards. The paper's value.
Wording: The standard sentence, used from 4 September 2026.
Run id: 5g2oxxc7vq
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	10 minutes	10 min 27 s	Within 5%
Middle	40 minutes	40 min 19 s	Within 5%
Longest (this run)	150 minutes	8 min 18 s	18.09× shorter
Other agents, longest request
GPT 6 Astra	150 minutes	2 h 30 min	Within 5%
Claude Fable 5.1	150 minutes	21 min 41 s	6.92× shorter

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Data and citation