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Values of ANTHROPIC_DEFAULT_SONNET_MODEL, ANTHROPIC_DEFAULT_OPUS_MODEL, and similar model env vars are now trimmed before use. This prevents subtle mismatches when env vars are set with trailing newlines or spaces (common when set via export VAR=$(command)).
Evidence
.trim() applied to model env var reads (search for "ANTHROPIC_DEFAULT_SONNET_MODEL" in context of .trim())
Strings lifted out of the shipped bundle, so the claim above can be checked against them.