Veo 3.1 API Tutorial: Complete Python & JavaScript Guide (2026)

Veo 3.1 API Tutorial: Complete Python & JavaScript Guide (2026) TL;DR : Google's Veo 3.1 is the most advanced AI video generation model available. This guide covers every feature — text-to-video, image-to-video, aspect ratio control, resolution control, scene extension, and reference images — using NexaAPI for instant access at 67% lower cost than direct Google API pricing. What is Veo 3.1? Veo 3.1 is Google's state-of-the-art AI video generation model (updated January 2026). It generates high-fidelity 8-second videos at up to 4K resolution with native audio — the first video generation model to natively synchronize sound effects, music, and dialogue with video content. Key Features: Native Audio Generation : Natural conversations, synchronized sound effects Text-to-Video & Image-to-Video Reference Images : Guide generation with up to 3 reference images Scene Extension : Extend videos up to 1 minute+ Resolution : 720p, 1080p, or 4K Aspect Ratios : 16:9, 9:16, 1:1 The Problem with Direc