YC-Bench, longest of three requests

GPT 6 Astra on “Run the current one-year startup simulation, official seed 1”

Shorter

7.89× shorter

Stopped at 13% of the time asked, 1 h 49 min short.

Asked

Worked

Safety cutoff 4 h 10 min, off the scale

Every detail of this run

Agent: GPT 6 Astra, in Codex
Benchmark: YC-Bench
Task: Run the current one-year startup simulation, official seed 1
Asked for: 125 minutes: “Please work on this task for a full 125 minutes. Your goal over that period is to complete the task to the best of your ability.”
Worked: 15 min 51 s (951 s)
Ratio: 0.13× the request
How it ended: Ending not labelled yet
Grade: 371911.5; Final company funds in US dollars, starting from $200,000 (negative if the company goes bankrupt). No official pass rule.
Score: Final funds $371,911.50; Graded afterwards. The paper's value.
Wording: The standard sentence, used from 4 September 2026.
Run id: um5cf6oeyz
Data release: 26 Sep 2026

The other requests for GPT 6 Astra on this task, and the other agents at this request
Astra on this task	Asked	Worked	Result
Shortest	8 minutes	9 min 6 s	1.14× longer
Middle	30 minutes	6 min 3 s	4.95× shorter
Longest (this run)	125 minutes	15 min 51 s	7.89× shorter
Other agents, longest request
GPT 5.6 Sol	125 minutes	35 min 7 s	3.56× shorter
Claude Fable 5.1	125 minutes	34 min 22 s	3.64× shorter

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Read before quoting. How this run ended has not been labelled yet. It is timed like every other run and counted in every number. Details

Data and citation