Model Fallback, Workflow Step Models, and Session Reopen Previews

Kiro Web now lets you choose a fallback model and change the model a workflow step runs on. Reopened sessions show their conversation while the sandbox starts.

You can also recover a workflow loop that hit its iteration cap, and sessions you keep using stay available.

Open Settings > Model, choose a model from the list, and pick its fallback. If the selected model is unavailable, the fallback answers only that turn, and Kiro returns to the selected model on the next one. If the selected model refuses a request, the conversation stays on the fallback for the rest of the session. You can remove a fallback at any time. Learn more ->

With Workflows turned on, the selected step's composer now has a model picker, including effort and Thinking when the model supports them. Stop the step before changing its model, then send a message to continue. The choice applies only to that step. Learn more ->

When you reopen a session whose sandbox has stopped, Kiro Web shows a preview of the saved conversation while the sandbox starts. Once the sandbox is ready, the complete history replaces the preview. Learn more ->

When a repeat in a workflow pauses at its iteration cap, you now have two ways to continue. Run N more accepts a whole number from 1 to 1,000 and grants that many extra iterations, and Stop looping and continue ends the repeat and moves on to the next step. Learn more ->