GPT-5.4 Image 2 vs Nano Banana 2 (Gemini 3.1 Flash Image Preview): side-by-side summary

GPT-5.4 Image 2 and Nano Banana 2 (Gemini 3.1 Flash Image Preview) are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

GPT-5.4 Image 2, from OpenAI, has a 272,000-token context window and is priced at $8/M tokens input, $15/M tokens output on OpenRouter.

Nano Banana 2 (Gemini 3.1 Flash Image Preview), from Google, has a 65,536-token context window and is priced at $0.50/M tokens input, $3/M tokens output on OpenRouter.

Context window

• GPT-5.4 Image 2: 272,000 tokens
• Nano Banana 2 (Gemini 3.1 Flash Image Preview): 65,536 tokens

Price

• GPT-5.4 Image 2: $8/M tokens input, $15/M tokens output
• Nano Banana 2 (Gemini 3.1 Flash Image Preview): $0.50/M tokens input, $3/M tokens output

Provided by

• GPT-5.4 Image 2: OpenAI
• Nano Banana 2 (Gemini 3.1 Flash Image Preview): Google

• GPT-5.4 Image 2 model details, providers and pricing
• Nano Banana 2 (Gemini 3.1 Flash Image Preview) model details, providers and pricing