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@ai-billing/openai
@ai-billing/openai / createOpenAIV3Middleware

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Function: createOpenAIV3Middleware()

createOpenAIV3Middleware<TTags>(options): LanguageModelV3Middleware
Defined in: openai/src/ai-sdk/language-model-middleware/v3/language-model-v3-openai-billing-middleware.ts:91 Creates a V3 billing middleware for the OpenAI provider (@ai-sdk/openai). Maps AI SDK usage into billing fields and resolves cost from pricing plus usage.

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Type Parameters

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TTags

TTags extends JSONObject The shape of the tags object, extending DefaultTags.

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Parameters

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options

OpenAIV3MiddlewareOptions<TTags> Billing options; see OpenAIV3MiddlewareOptions.

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Returns

LanguageModelV3Middleware A V3 billing middleware instance for OpenAI.

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Example

Same wiring as examples/dev-sandbox/app/api/openai (createOpenAIMiddleware is this function’s export alias from @ai-billing/openai). 
import { createOpenAI } from '@ai-sdk/openai';
import { wrapLanguageModel } from 'ai';
import { createOpenAIMiddleware } from '@ai-billing/openai';
import {
  consoleDestination,
  createObjectPriceResolver,
  type ModelPricing,
} from '@ai-billing/core';

const openai = createOpenAI({ apiKey: process.env.OPENAI_API_KEY });

const customPricingMap: Record<string, ModelPricing> = {
  'gpt-5': {
    promptTokens: 1.25 / 1_000_000,
    completionTokens: 10.0 / 1_000_000,
    inputCacheReadTokens: 0.125 / 1_000_000,
  },
  'gpt-4o': {
    promptTokens: 5.0 / 1_000_000,
    completionTokens: 15.0 / 1_000_000,
  },
};

const priceResolver = createObjectPriceResolver(customPricingMap);

const billingMiddleware = createOpenAIMiddleware({
  destinations: [consoleDestination()],
  priceResolver,
});

const wrappedModel = wrapLanguageModel({
  model: openai('gpt-5'),
  middleware: billingMiddleware,
});