One of the most important properties of LLMs that we take for granted is that newer, bigger models are just better at everything. The AI Lab…

One of the most important properties of LLMs that we take for granted is that newer, bigger models are just better at everything. The AI Labs are pouring effort into economically valuable fields like coding, but bigger models are also better at negotiation, alignment, poetry, etc First update to PACT, my head-to-head LLM negotiation benchmark! 20-round buyer-seller bargaining game: each round the AIs can message, the buyer submits a bid and the seller submits an ask. If bid ≥ ask, trade clears at the midpoint. Thousands of matchups! GPT-5.5 is #1

Source: Ethan Mollick (X) | 2026-05-11