Unable to view openai cachedPromptTokens in providerMetadata

[bobbyzhong]

Description

I'm using streamText and trying to see prompt caching results from the request. According to the docs here I should be able to see information about prompt caching through providerMetadata. However, when I log out providerMetadata like this

const providerMetadata = await streamResult.providerMetadata; console.log("PROVIDER METADATA", providerMetadata);

This is what I get
PROVIDER METADATA { openai: { responseId: 'resp_68b8a9962d6881959b8ef32423e42dad098f808d181f89bf', logprobs: [ [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [] ] } }

When I just log out streamResult.usage I see this

USAGE { inputTokens: 6003, outputTokens: 92, totalTokens: 6095, reasoningTokens: 0, cachedInputTokens: 5760 }

Why does the provider metadata not show any information about prompt caching?

Thanks!

AI SDK Version

"ai": "^5.0.22",
"@ai-sdk/anthropic": "^2.0.6",
"@ai-sdk/google": "^2.0.8",
"@ai-sdk/openai": "^2.0.19",
"@ai-sdk/provider-utils": "^3.0.5",

Code of Conduct

• I agree to follow this project's Code of Conduct

[gr2m]

Thanks for reporting this problem Bobby!

It seems that our docs are outdated. cachedPromptTokens has been removed in #6140. Can you try to logout streamResult.usage.cachedInputTokens instead?

We should update the docs and also our v4 to v5 migration docs, maybe here?