Unclear What this changes for someone turning fast mode on is not clear.
What
When you turn fast mode on, Claude Code now looks up which model fast mode will run on. It uses that model when it saves your settings and in a related step that runs at the same moment. Before, it used the main model of the conversation and did not pass a model when saving. If applying the change fails, the message is "Fast mode was not changed: applying it failed".
Why
This may fix cases where the model shown and the model fast mode actually runs on did not match.
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What this changes for someone turning fast mode on is not clear.