Flux 2 Flex API Tutorial: Generate Images in 3 Lines of Code (Python & JavaScript)

Flux 2 Flex API Tutorial: Generate Images in 3 Lines of Code (Python & JavaScript) March 2026 | Black Forest Labs Flux 2 Flex Developer Guide Black Forest Labs just released FLUX.2 [Flex] — and it's a significant upgrade over the original Flux family. This tutorial shows you how to access the Flux 2 Flex API via NexaAPI at $0.003/image — the cheapest access available anywhere. What Is Flux 2 Flex? FLUX.2 [Flex] is the developer-focused member of Black Forest Labs' new FLUX.2 image generation family. Unlike Flux 1.1 Pro (which makes all the quality/speed decisions for you), Flex gives you full control : Key Features 🎛️ Controllable generation : Adjust inference steps (6-50) and guidance scale (2-5) to balance speed vs. quality 📝 Best-in-class text rendering : Typography, captions, infographics — Flex handles text in images better than any other model 🖼️ Multi-reference inputs : Upload up to 10 reference images to blend styles, maintain character consistency, or guide composition ✏️ Imag