Bug: Usage is empty in ai sdk v6

[ekansh-tdc]

Description

On the new beta ai sdk release, when i access usage or totalUsage, they are coming as undefined.

Code:-

import { generateText } from 'ai'

const result = await generateText({
  model: 'google/gemini-2.5-flash',
  prompt: 'What is life?'
})

console.log(result.totalUsage, result.usage)

Console output:-

bun test.ts
{
  inputTokens: undefined,
  inputTokenDetails: {
    noCacheTokens: undefined,
    cacheReadTokens: undefined,
    cacheWriteTokens: undefined,
  },
  outputTokens: undefined,
  outputTokenDetails: {
    textTokens: undefined,
    reasoningTokens: undefined,
  },
  totalTokens: undefined,
  reasoningTokens: undefined,
  cachedInputTokens: undefined,
} {
  inputTokens: undefined,
  inputTokenDetails: {
    noCacheTokens: undefined,
    cacheReadTokens: undefined,
    cacheWriteTokens: undefined,
  },
  outputTokens: undefined,
  outputTokenDetails: {
    textTokens: undefined,
    reasoningTokens: undefined,
  },
  totalTokens: undefined,
  raw: undefined,
  reasoningTokens: undefined,
  cachedInputTokens: undefined,
}

AI SDK Version

ai: 6.0.0-beta.156

Code of Conduct

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[ravisojitra]

+1