Gemini 2.5 Flash Image Preview (Nano Banana) vs GPT-5 Nano: side-by-side summary

Gemini 2.5 Flash Image Preview (Nano Banana) and GPT-5 Nano are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

Gemini 2.5 Flash Image Preview (Nano Banana), from Google, has a 32,768-token context window and is priced by the provider serving it on OpenRouter.

GPT-5 Nano, from OpenAI, has a 400,000-token context window and is priced at $0.05/M tokens input, $0.40/M tokens output on OpenRouter.

Context window

• Gemini 2.5 Flash Image Preview (Nano Banana): 32,768 tokens
• GPT-5 Nano: 400,000 tokens

Price

• Gemini 2.5 Flash Image Preview (Nano Banana): Pricing varies by provider
• GPT-5 Nano: $0.05/M tokens input, $0.40/M tokens output

Provided by

• Gemini 2.5 Flash Image Preview (Nano Banana): Google
• GPT-5 Nano: OpenAI

• Gemini 2.5 Flash Image Preview (Nano Banana) model details, providers and pricing
• GPT-5 Nano model details, providers and pricing