What
At startup, Claude Code can offer a model upgrade to people who reach Claude through Amazon Bedrock or Google Vertex, which are cloud services that host Claude models. This startup step now stops straight away unless the provider in use matches the provider the offer is for. The step also saves its setting with a different value in one of the arguments it passes.
Why
Someone using Bedrock no longer goes through the Vertex version of the offer, and someone using Vertex no longer goes through the Bedrock version.
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The writer flagged doubt
The finding does not say what the changed fourth argument to the settings write does.