Pi has partnered with OpenAI to add Sign in with ChatGPT. Pi users can now reach their OpenAI subscriptions and credits in Pi through one unified login flow.
On Ibragim’s my-mini-bench in pi, Sonnet 5.5 and Opus 5.5 High both passed 30 of 30 runs. Sonnet 5.5 took 46 seconds and $0.10 per task, versus 103 seconds and $0.30 for Opus 5.5 High.
Pi tells users to run pi update --models alongside Claude’s introduction of Claude Sonnet 5.5. Claude says the model is the second in the Claude 5.5 family, runs more than 30% faster than Sonnet 5, and costs up to 30% less for most work.
Claude says Opus 5.5 performs at the level of Claude Fable 5.1 for most tasks and costs 40% less to run than Opus 5. Pi says users who want it in Pi can wait or run pi update --models.