The AI Image Bible

As of April 25, 2026 three models lead AI image generation: OpenAI's gpt-image-2, Midjourney V8.1 Alpha, and Google's Gemini 3 Pro Image (Nano Banana Pro). Each has its own prompt grammar, its own payload structure, its own pricing, and its own category of strengths. This is the one reference that covers all three properly: API payloads, parameter syntax, JSON prompting, character consistency patterns, the interleaved payload technique, pricing at every tier, example outputs from each model, and the complete companion repo of prompts and payload templates.

• Full reference for all three 2026 flagship models: gpt-image-2, Midjourney V8.1 Alpha, Gemini 3 Pro Image
• Complete API payloads for OpenAI Images, Gemini generateContent with reference images, Midjourney parameters
• JSON prompting for Gemini 3: structured pattern that raises accuracy 60 to 80 percent on multi-constraint tasks