Dart Requires Chilkat v11.4.0+

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.

Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // This example assumes the Chilkat API to have been previously unlocked.
  // See Global Unlock Sample for sample code.

  final ai = CkAi();

  // 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-5.6-luna';

  // 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.
  final fileId = 'file-5G2xncrEiHbVfYPRpFgP9c';
  ai.inputAddFileId(fileId, 'application/json');

  ai.inputAddText('Explain why Hamlet delays taking revenge, using only evidence from the file.');

  // Ask the AI for text output.
  try {
    ai.ask('text');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Get the text response.
  final sbResponse = CkStringBuilder();
  ai.getOutputTextSb(sbResponse);
  print(sbResponse.getAsString());
}