Paste Your Prompt Twice and Watch Accuracy Change
Google Research validated it across 7 models and 7 benchmarks. No training, no prompt engineering. Just copy-paste. I tested it and here's what actually happened.
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prompt-engineering
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From 6.7% to 68.3% Task Success: The Harness Made the 10x Difference, Not the Model
What LangChain's Terminal Bench results and the hashline format experiment revealed. The same model flipped leaderboard rankings, and the reasons came down to three things: prompts, tools, and middleware.