btw, @pidotdev is the official account for pi on this hell site. go give it a follow.

Sonnet 5.5 vs Opus 5.5 High on my-mini-bench and comparison with Sonnet 5 I tested them on tasks from my own work: data conversion, frontend, refactoring and running task evaluations. Setup: 10 tasks × 3 runs, High reasoning, in pi-agent and Claude Code through harbor. Sonnet 5.5 vs Opus 5.5 in pi: > Both passed 30/30. > Time: 46s vs 103s: ~2.2× faster. > Cost: $0.10 vs $0.30 per task: ~3× cheaper. Compared with Sonnet 5 in pi: > Passes: 25/30 → 30/30. > Turns: 12.7 → 4.3 > Output tokens: 17.7k → 6.5k The trajectories show a different approach to reading files, writing code, and testing. Examples below 👇 This benchmark is already saturated, but I use it to find the best setup for my tasks: cheaper, faster, and still gets the job done. It also lets me quickly compare models and see how their behavior differs.

Introducing Claude Sonnet 5.5, the second model in the Claude 5.5 family. It’s a clear upgrade over Sonnet 5, runs more than 30% faster, and costs up to 30% less for most work.

we’re thinking of killing plan mode and using the shift+tab hotkey to adjust effort levels I don’t think the models need plan mode anymore, but if you’re a plan mode diehard would love to get your feedback on why

Introducing Claude Opus 5.5, the first model in our new Claude 5.5 family. It performs at the level of Claude Fable 5.1 for most tasks, and costs 40% less to run than Opus 5.