GPT-5 Image Mini vs Nano Banana Pro (Gemini 3 Pro Image Preview): side-by-side summary

GPT-5 Image Mini and Nano Banana Pro (Gemini 3 Pro Image Preview) are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

GPT-5 Image Mini, from OpenAI, has a 400,000-token context window and is priced at $2.50/M tokens input, $2/M tokens output on OpenRouter.

Nano Banana Pro (Gemini 3 Pro Image Preview), from Google, has a 65,536-token context window and is priced at $2/M tokens input, $12/M tokens output on OpenRouter.

Context window

• GPT-5 Image Mini: 400,000 tokens
• Nano Banana Pro (Gemini 3 Pro Image Preview): 65,536 tokens

Price

• GPT-5 Image Mini: $2.50/M tokens input, $2/M tokens output
• Nano Banana Pro (Gemini 3 Pro Image Preview): $2/M tokens input, $12/M tokens output

Provided by

• GPT-5 Image Mini: OpenAI
• Nano Banana Pro (Gemini 3 Pro Image Preview): Google

• GPT-5 Image Mini model details, providers and pricing
• Nano Banana Pro (Gemini 3 Pro Image Preview) model details, providers and pricing