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Installation

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Overview

The @ai-billing/minimax package provides middleware for tracking token usage and calculating costs when using Minimax models with the Vercel AI SDK. It captures Minimax-specific metrics, such as internalReasoningTokens, ensuring that reasoning costs are accurately reflected.

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Usage

To use the middleware, wrap your Minimax model (which is accessed via the Anthropic provider) using wrapLanguageModel from the ai package and pass the createMinimaxMiddleware.
1

Initialize the Minimax provider

First, set up the provider using the Anthropic SDK with the Minimax base URL and your API key.
2

Define model pricing

Set up a price resolver to define the costs for the models you’ll be using. For Minimax, you can specify costs for standard prompt/completion tokens and reasoning tokens (internalReasoningTokens).
3

Create the billing middleware

Initialize the Minimax billing middleware. You need to provide a destination (such as consoleDestination) where billing events will be sent, along with your priceResolver.
4

Wrap the model

Use wrapLanguageModel from the ai package to apply the billing middleware to your Minimax model.
5

Use the wrapped model

Finally, use the wrapped model with AI SDK functions like generateText or streamText. The billing middleware will automatically track tokens, handle reasoning metrics, and calculate costs.