Ethan Mollick's Co-Existence Charts 30 Months of AI Progress, Made by Claude Opus 5.5

Ethan Mollick published Co-Existence, his second AI book, 30 months after Co-Intelligence, and used Claude Opus 5.5 in Claude Projects to generate the post's charts and an "otter on an airplane using wifi" video in minutes. He notes 180 models now outperform GPT-4 at release, 19 of which run on a modern smartphone, while METR's Long Horizon Benchmark rose from a four-minute task in 2024 to 17 hours of human work by April 2026 before the benchmark ran out.