(PowerShell) 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.

Chilkat .NET Downloads

Chilkat .NET Assemblies

Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"

$success = $false

$success = $false

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

$ai = New-Object 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.
$file_id = "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 -eq $false) {
    $($ai.LastErrorText)
    exit
}

# Get the text response.
$sbResponse = New-Object Chilkat.StringBuilder
$ai.GetOutputTextSb($sbResponse)
$($sbResponse.GetAsString())