Best AI Models for Image Generation - April 2026
GPT Image 1.5 leads Artificial Analysis at 1278 Elo while Nano Banana 2 tops Arena.ai - two leaderboards, two answers, and five new models that reshaped the rankings since March.
Diffusion models
LTX-2.3: 22B Open-Source Video and Audio Model
LTX-2.3 is a 22-billion-parameter open-source video generation model from Lightricks that produces native 4K video with synchronized audio in a single diffusion pass.
Helios: Real-Time 14B Open-Source Video Model
Helios is a 14B open-source autoregressive diffusion model that generates minute-long videos at 19.5 FPS on a single H100, matching 1.3B distilled model speeds at full 14B quality.
LTX-2.3 Review: Open-Source Video AI That Delivers
LTX-2.3 is a 22-billion-parameter open-source video and audio generation model from Lightricks that rivals closed commercial tools - at zero cloud cost.
Mercury 2 Review: 1,000 Tokens per Second, Tested
Mercury 2 by Inception Labs is the fastest reasoning LLM available, built on diffusion architecture. We tested the speed, quality, and real-world trade-offs.
Inception Ships Mercury 2 - A Diffusion LLM That Hits 1,009 Tokens Per Second
Inception Labs launches Mercury 2, the first diffusion-based reasoning language model, generating over 1,000 tokens per second on Blackwell GPUs at a fraction of the cost of conventional autoregressive models.
