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Why is it ...
Why is it recommended to pin a specific model version (e.g. "claude-sonnet-4-5") in production rather than using an alias like "claude-sonnet-latest"?
To ensure consistent, reproducible behaviour — model updates behind an alias can change outputs and break existing prompts
Because aliases cost more to call than versioned model IDs
Because aliases are only available in the sandbox environment
To increase request throughput by bypassing model routing
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