Claude Sonnet 5 Pricing: Your $2/$10 Window Closes Aug 31
Claude Sonnet 5's introductory API pricing of $2 per million input tokens and $10 per million output ends August 31, 2026, stepping up 50% to the standard $3/$15 on September 1. That intro window is the only period the model is both cheaper and stronger than Sonnet 4.6, which already costs $3/$15. Prompt caching and the Batch API stack with the discount, pulling effective input rates as low as $0.20 per million. For PMs, the move this quarter is to run migrations and evals at intro rates while modeling all unit economics at the standard price.