November 3, 2026
AI agents don't fall for a renegotiable contract: 0 investments in 864 games

In humans, the same contract clause raised investment to as much as 67.2% (a 2011 lab experiment), while Claude Opus 5.5 and GPT-6.1 Sol did not invest in any of 864 games. A rigid option with no right to renegotiate drew 288 investments out of 288.