(VB.NET) Referencing a Pre-Uploaded File by file_id in an AI Request

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Some AI proviers have a Files API that lets you upload content once and then reference it later in generation requests using a file_id. This is especially useful for large documents, reuse across multiple prompts, or keeping inputs structured and separate from your prompt text.

This example demonstrates how to use a file_id in a request.

Note: This example requires Chilkat v11.4.0 or greater.

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Chilkat .NET Framework

Chilkat for .NET Core

Dim success As Boolean = False

success = False

' This example assumes the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.

Dim ai As New Chilkat.Ai

' The provider can be "openai", "google", "claude", "mistral", "deepseek", "xai", or any provider
' that supports referencing pre-uploaded files by a file_id (or file uri).
ai.Provider = "openai"

' Use your provider's API key.
ai.ApiKey = "MY_API_KEY"

' Choose a model.
ai.Model = "gpt-5-mini"

' See the following example showing how to upload a file
' Upload a File to an AI Provider (OpenAI, Google, Antropic, X)

' Use the file_id of the pre-uploaded file.
Dim file_id As String = "file-5G2xncrEiHbVfYPRpFgP9c"
ai.InputAddFileId(file_id,"application/json")

ai.InputAddText("Explain why Hamlet delays taking revenge, using only evidence from the file.")

' Ask the AI for text output.
success = ai.Ask("text")
If (success = False) Then
    Debug.WriteLine(ai.LastErrorText)
    Exit Sub
End If


' Get the text response.
Dim sbResponse As New Chilkat.StringBuilder
ai.GetOutputTextSb(sbResponse)
Debug.WriteLine(sbResponse.GetAsString())