The fallback model list can now be set in settings.json as an array, not only via --fallback-model on the command line.
Usage
# Via CLI (comma-separated, as before)
claude --fallback-model sonnet,haiku
# Via settings.json (new — array form)
# In ~/.claude/settings.json or project .claude/settings.json:
# { "fallbackModel": ["sonnet", "haiku"] }
Details
Accepts model name aliases such as "sonnet", "haiku", or "default" (which expands to the current default model)
The setting is also available in managed settings for enterprise deployments
Models that are not recognized or not available in the current context are silently skipped
Evidence
New fallbackModel schema field (search for 'Fallback model(s) tried in order when the primary model is overloaded or unavailable')
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
How sure we are
One source agreesOne thing we can check says the same as this entry.
Anthropic's release notes agreeAdded fallbackModel setting to configure up to three fallback models tried in order when the primary model is overloaded or unavailable…
