Image Generation with Gemini, OpenAI, and xAI

Generate and edit images using Google Gemini, OpenAI GPT Image 2, and xAI Grok Image APIs via shell scripts.

Available Providers

Model: gemini-3-pro-image-preview (default, "Nano Banana Pro"). Alt: gemini-3.1-flash-image-preview (Flash, 14 ratios).
Strengths: Premium quality, up to 4K output, thinking mode, Google Search grounding, multi-turn editing with up to 14 reference images
Aspect ratios: 10 on Pro (1:1, 16:9, 9:16, 4:3, 3:4, 3:2, 2:3, 4:5, 5:4, 21:9); Flash adds 4 extreme ratios (1:4, 4:1, 1:8, 8:1)
Resolution: --image-size takes 1K, 2K, 4K on both Pro and Flash; Flash additionally supports 512 (UPPERCASE required)
Env var: GEMINI_API_KEY

Model: gpt-image-2 (default, snapshot gpt-image-2-2026-04-21); gpt-image-1.5 available as previous flagship via --model
Strengths: Superior text rendering, transparent backgrounds, up to 16 input images for editing, quality tiers
Sizes: 1024x1024, 1536x1024 (landscape), 1024x1536 (portrait)
Quality: low (fast/cheap), medium, high (best fidelity)
Env var: OPENAI_API_KEY