AI Proposal Persuasiveness, Tested

Which AI is the most persuasive?

I was in Miami, speaking at a MarkNet event, and somebody asked about the best AI for writing proposals. I wanted to give a qualified answer, so after my session I sat in the back of the room and ran a quick experiment to determine which AI was the most effective at writing persuasive proposals.

I used Gemini in Google AI Studio to build a weighted persuasion score for proposals.

I used Anthropic console to generate a prompt to write the proposals.

I invoked a couple of my favorite sales frameworks, behavioral psychology, and set readability levels.

I picked Auction Details from a random online property auction.

I used the proposal writing prompt and the auction details to build a proposal with:

  • Gemini
  • DeepSeek
  • Claude
  • Grok
  • ChatGPT

I ran each through the scoring system.

This was just me and I only tested everything once. This should be repeated multiple times with fresh examples, and in random order, but here’s what I found from one test run:

Persuasion scores:

  1. DeepSeek: 4.9 / 5
  2. Claude: 4.8 / 5 (5.15 / 5 & 4.45 / 5)
  3. Gemini: 4.5 / 5
  4. Grok: 4.5 / 5
  5. ChatGPT: 3.4 / 5

Interested to see what you get if anyone wants to repeat the experiment and share results.

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