Gemini 3 Pro Preview vs GPT-5 Image Mini: side-by-side summary

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

Gemini 3 Pro Preview, from Google, has a 1,048,576-token context window and is priced by the provider serving it on OpenRouter.

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.

Context window

• Gemini 3 Pro Preview: 1,048,576 tokens
• GPT-5 Image Mini: 400,000 tokens

Price

• Gemini 3 Pro Preview: Pricing varies by provider
• GPT-5 Image Mini: $2.50/M tokens input, $2/M tokens output

Provided by

• Gemini 3 Pro Preview: Google
• GPT-5 Image Mini: OpenAI

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