The Claude API offers a 50% discount on on-demand token prices when you use the Batch API. For Claude Sonnet 4.6 (and earlier 4.x Sonnet models), the batch rate is $1.50 per million input tokens and $7.50 per million output tokens. [1, 2]

Claude Sonnet API Pricing

Here is a breakdown of how batch pricing compares to standard on-demand and cached pricing (all rates per 1M tokens): [1, 2]