Use case
Claude Opus 4.8 tool calling
tool calling notes for claude-opus-4-8: the rate card, a worked volume, and when to send this ID. A sample of 1 million input tokens plus 200 thousand output tokens is about $2.00 on corouter (input $1.00, output $1.00).
Tool definitions count as input
Tool JSON schemas count toward input tokens. Input for claude-opus-4-8 is $1.00. More tools and longer schemas raise the input bill. The output rate does not change.
Claude Opus 4.8 matches the Opus 5 list rate and window, without the Opus 5.5 cache-read cut. Send claude-opus-4-8 to keep an Opus 4.8 client unchanged.
Set it next to a lower output rate
Claude Opus 4.8 (claude-opus-4-8) lists at $5.00 input and $25.00 output per million tokens. corouter bills $1.00 input and $5.00 output. Context is 1M.
A sample of 1 million input tokens plus 200 thousand output tokens is about $2.00 on corouter (input $1.00, output $1.00).
Questions
- Which model ID should the request send?
- Send claude-opus-4-8. Do not put a different name in the model field.
- What is the minimum top-up?
- Prepaid credits, $5 minimum top-up, no subscription tier.