Faster turns, sturdier sandboxes
Per-project sandbox isolation, the snapshot/rollback contract, and an opt-in switch between Opus 4.7 and Sonnet 4.6 for cost-sensitive turns.
New — snapshot and rollback
Every agent turn now writes an immutable point-in-time snapshot of your project files. If a turn goes sideways, one click reverts the entire workspace to the state before that turn — no merge prompts, no half-applied edits.
Improved — sandbox boot
We rewrote the per-project sandbox to install dependencies once and snapshot the result. Subsequent turns boot from a warm image, so the time between "ask" and "see the preview" dropped by roughly half on first-edit turns.
Improved — model switching
The model picker now lives next to the composer. Default stays on Opus 4.7 for agentic turns; switch to Sonnet 4.6 for one-shot refactors when you want to spend half the credits.