Anthropic

Anthropic Token Counting API

Count the number of tokens in a Message, including tools, images, and documents, without creating it. The Token Count API accepts the same structured list of inputs for creating a message, including support for system prompts, tools, images, and PDFs. Token counting is free to use but subject to requests per minute rate limits.

Documentation GitHub OpenAPI

Documentation

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Documentation

https://docs.anthropic.com/en/api/messages-count-tokens

Specifications

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OpenAPI

https://raw.githubusercontent.com/api-evangelist/anthropic/refs/heads/main/properties/anthropic-token-counting-api-openapi.yml