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Gemini 3 Flash Preview vs GPT-5.1: side-by-side summary

Gemini 3 Flash Preview and GPT-5.1 are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

Gemini 3 Flash Preview, from Google, has a 1,048,576-token context window and is priced at $0.50/M tokens input, $3/M tokens output on OpenRouter.

GPT-5.1, from OpenAI, has a 400,000-token context window and is priced at $1.25/M tokens input, $10/M tokens output on OpenRouter.

Context window
  • Gemini 3 Flash Preview: 1,048,576 tokens
  • GPT-5.1: 400,000 tokens
Price
  • Gemini 3 Flash Preview: $0.50/M tokens input, $3/M tokens output
  • GPT-5.1: $1.25/M tokens input, $10/M tokens output
Provided by
  • Gemini 3 Flash Preview: Google
  • GPT-5.1: OpenAI
  • Gemini 3 Flash Preview model details, providers and pricing
  • GPT-5.1 model details, providers and pricing