Zig 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.

Zig

const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

    var success: bool = false;

    success = false;

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

    const ai = try chilkat.Ai.init();
    defer ai.deinit();

    // 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.setProvider("openai");

    // Use your provider's API key.
    ai.setApiKey("MY_API_KEY");

    // Choose a model.
    ai.setModel("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.
    const file_id = "file-5G2xncrEiHbVfYPRpFgP9c";
    ai.inputAddFileId(file_id, "application/json") catch {};

    ai.inputAddText("Explain why Hamlet delays taking revenge, using only evidence from the file.") catch {};

    // Ask the AI for text output.
    ai.ask("text") catch {
        std.debug.print("{s}\n", .{try ai.getLastErrorText(alloc)});
        return;
    };

    // Get the text response.
    const sb_response = try chilkat.StringBuilder.init();
    defer sb_response.deinit();
    ai.getOutputTextSb(sb_response) catch {};
    std.debug.print("{s}\n", .{try sb_response.getAsString(alloc)});
}