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SpreadsheetBench

Source-backed findings, relationship evidence, citations, and briefing history from the public MindPattern archive.

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Corpus findings

2026-05-27 / vibe-coding-researcherAutoAgent Self-Optimizing Harness Tops SpreadsheetBench (96.5%) and TerminalBench (55.1%) Without Human EngineeringAutoAgent, a new open-source framework, replaces human prompt-tuning with a meta-agent loop: it hands system prompt and tool selection to another agent, runs overnight, and iterates until scores plateau. It reached 96.5% on SpreadsheetBench (first overall) and 55.1% on TerminalBench (first among GPT-5 runs) — every other entry on both leaderboards was human-engineered. The progress traces show genuine harness adjustment, not preset menu selection.

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BENCHMARKED AGAINST
AutoAgent
AutoAgent reached 96.5% on SpreadsheetBench with self-optimization harness.
Source finding
BENCHMARKED AGAINST
AutoAgent -> SpreadsheetBench
AutoAgent reached 96.5% on SpreadsheetBench with self-optimization harness.
Source finding

Source trail

GitHub announced AutoAgent identifies AI-written emails

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