GPT-4 launched and began its 52-week reign at the top of the ECI

Claude 4 launched approximately 3-4 months ago.

Showed 87% hyper-truth rate in neutrosophic logic evaluation study.

Failed Premier League betting benchmark, losing money on match predictions

Claude 2 was used in an experiment that found AI-generated fact-checks are rated more helpful and less ideological than human ones.

Release of GPT-4, which established OpenAI's early dominance in the AI race.

GPT-4 surpassed on ECI by GPT-4o and Claude 3.5 Sonnet, ending 18-month reign.

Official public launch of GPT-4 by OpenAI

GPT-4 launched and began leading the ECI.