> ## Documentation Index > Fetch the complete documentation index at: https://openrouter-d02e98a0-mintlify-7021d5f4.mintlify.site/llms.txt > Use this file to discover all available pages before exploring further. # GenerationResponseData - Go SDK > GenerationResponseData type definition The Go SDK and docs are currently in beta. Report issues on [GitHub](https://github.com/OpenRouterTeam/go-sdk/issues). Generation data ## Fields | Field | Type | Required | Description | Example | | ------------------------------ | --------------------------------------------------------------------------------------- | -------------------- | ------------------------------------------------------------------------------------------------------- | ------------------------------------------------ | | `APIType` | [\*components.APIType](/client-sdks/go/api-reference/models/apitype) | :heavy\_check\_mark: | Type of API used for the generation | | | `AppID` | `*int64` | :heavy\_check\_mark: | ID of the app that made the request | 12345 | | `CacheDiscount` | `*float64` | :heavy\_check\_mark: | Discount applied due to caching | 0.0002 | | `Cancelled` | `*bool` | :heavy\_check\_mark: | Whether the generation was cancelled | false | | `CreatedAt` | `string` | :heavy\_check\_mark: | ISO 8601 timestamp of when the generation was created | 2024-07-15T23:33:19.433273+00:00 | | `ExternalUser` | `*string` | :heavy\_check\_mark: | External user identifier | user-123 | | `FinishReason` | `*string` | :heavy\_check\_mark: | Reason the generation finished | stop | | `GenerationTime` | `*float64` | :heavy\_check\_mark: | Time taken for generation in milliseconds | 1200 | | `HTTPReferer` | `*string` | :heavy\_check\_mark: | Referer header from the request | | | `ID` | `string` | :heavy\_check\_mark: | Unique identifier for the generation | gen-3bhGkxlo4XFrqiabUM7NDtwDzWwG | | `IsByok` | `bool` | :heavy\_check\_mark: | Whether this used bring-your-own-key | false | | `Latency` | `*float64` | :heavy\_check\_mark: | Total latency in milliseconds | 1250 | | `Model` | `string` | :heavy\_check\_mark: | Model used for the generation | sao10k/l3-stheno-8b | | `ModerationLatency` | `*float64` | :heavy\_check\_mark: | Moderation latency in milliseconds | 50 | | `NativeFinishReason` | `*string` | :heavy\_check\_mark: | Native finish reason as reported by provider | stop | | `NativeTokensCached` | `*int64` | :heavy\_check\_mark: | Native cached tokens as reported by provider | 3 | | `NativeTokensCompletion` | `*int64` | :heavy\_check\_mark: | Native completion tokens as reported by provider | 25 | | `NativeTokensCompletionImages` | `*int64` | :heavy\_check\_mark: | Native completion image tokens as reported by provider | 0 | | `NativeTokensPrompt` | `*int64` | :heavy\_check\_mark: | Native prompt tokens as reported by provider | 10 | | `NativeTokensReasoning` | `*int64` | :heavy\_check\_mark: | Native reasoning tokens as reported by provider | 5 | | `NumFetches` | `*int64` | :heavy\_check\_mark: | Number of web fetches performed | 0 | | `NumInputAudioPrompt` | `*int64` | :heavy\_check\_mark: | Number of audio inputs in the prompt | 0 | | `NumMediaCompletion` | `*int64` | :heavy\_check\_mark: | Number of media items in the completion | 0 | | `NumMediaPrompt` | `*int64` | :heavy\_check\_mark: | Number of media items in the prompt | 1 | | `NumSearchResults` | `*int64` | :heavy\_check\_mark: | Number of search results included | 5 | | `Origin` | `string` | :heavy\_check\_mark: | Origin URL of the request | [https://openrouter.ai/](https://openrouter.ai/) | | `PresetID` | `*string` | :heavy\_check\_mark: | ID of the preset used for this generation, null if no preset was used | a9e8d400-592a-494f-908c-375efa66cafd | | `ProviderName` | `*string` | :heavy\_check\_mark: | Name of the provider that served the request | Infermatic | | `ProviderResponses` | \[][components.ProviderResponse](/client-sdks/go/api-reference/models/providerresponse) | :heavy\_check\_mark: | List of provider responses for this generation, including fallback attempts | | | `RequestID` | optionalnullable.OptionalNullable\[`string`] | :heavy\_minus\_sign: | Unique identifier grouping all generations from a single API request | req-1727282430-aBcDeFgHiJkLmNoPqRsT | | `ResponseCacheSourceID` | optionalnullable.OptionalNullable\[`string`] | :heavy\_minus\_sign: | If this generation was served from response cache, contains the original generation ID. Null otherwise. | | | `Router` | `*string` | :heavy\_check\_mark: | Router used for the request (e.g., openrouter/auto) | openrouter/auto | | `ServiceTier` | `*string` | :heavy\_check\_mark: | Service tier the upstream provider reported running this request on, or null if it did not report one. | priority | | `SessionID` | optionalnullable.OptionalNullable\[`string`] | :heavy\_minus\_sign: | Session identifier grouping multiple generations in the same session | | | `Streamed` | `*bool` | :heavy\_check\_mark: | Whether the response was streamed | true | | `TokensCompletion` | `*int64` | :heavy\_check\_mark: | Number of tokens in the completion | 25 | | `TokensPrompt` | `*int64` | :heavy\_check\_mark: | Number of tokens in the prompt | 10 | | `TotalCost` | `float64` | :heavy\_check\_mark: | Total cost of the generation in USD | 0.0015 | | `UpstreamID` | `*string` | :heavy\_check\_mark: | Upstream provider's identifier for this generation | chatcmpl-791bcf62-080e-4568-87d0-94c72e3b4946 | | `UpstreamInferenceCost` | `*float64` | :heavy\_check\_mark: | Cost charged by the upstream provider | 0.0012 | | `Usage` | `float64` | :heavy\_check\_mark: | Usage amount in USD | 0.0015 | | `UserAgent` | `*string` | :heavy\_check\_mark: | User-Agent header from the request | | | `WebSearchEngine` | `*string` | :heavy\_check\_mark: | The resolved web search engine used for this generation (e.g. exa, firecrawl, parallel) | exa |