更新日: 2026-06-06
Claude Token Counting
POST /v1/messages request. It is useful for Claude CLI, Claude Code, budget checks, and context-trimming logic.
Authentication
The recommended headers follow Anthropic-style requests:Request Body
The body follows the Claude Messages shape. The smallest practical request usually includes:modelmessages
system, tools, tool results, or text content, those are included in the estimate too.
Request Example
Response Example
Response Fields
Current Limits
The current implementation mainly estimates:system- text content in
messages - text and JSON content in tool definitions and tool results
This endpoint returns an estimate, not a final billing record. Actual usage is determined by the real model call.