The First New “Version” in Three Years Pulls Off the Temperature Knob — Claude API Drops temperature/top_p/top_k in 2026-10-21 and Bumps Every SDK to a New Generation
Anthropic adds “2026-10-21,” its first new API version since 2023. It removes temperature/top_p/top_k and ships major updates to eight SDKs at once. The old version remains, but some warn the change hurts workloads that depend on reproducibility.