We're making Claude Sonnet 5's introductory pricing permanent. We launched Sonne

Claude Sonnet 5 will keep the price it launched with. Anthropic introduced the model in June at $2 per million input tokens and $10 per million output tokens, and described those rates as introductory, available through August 31. Its August 10 announcement says the price will now stay unchanged. Tokens are the small chunks of text a model is billed by: input tokens are what a developer sends to the model, and output tokens are what the model writes back. The two are priced separately.

The practical effect is that developers who built on Sonnet 5 at the launch rates no longer face a scheduled price change at the end of August. The announcement does not say what the price would have become, and only the post itself was read. Its linked page and any replies were not collected, so any detail they add, such as whether every platform or billing option keeps the same rates, is not covered here.