FLUX.2 Flex vs Gemini 3 Flash Preview: side-by-side summary

FLUX.2 Flex and Gemini 3 Flash Preview are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

FLUX.2 Flex, from black-forest-labs, has a 67,344-token context window and is priced from $0.06/megapixel on OpenRouter.

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.

Context window

• FLUX.2 Flex: 67,344 tokens
• Gemini 3 Flash Preview: 1,048,576 tokens

Price

• FLUX.2 Flex: from $0.06/megapixel
• Gemini 3 Flash Preview: $0.50/M tokens input, $3/M tokens output

Provided by

• FLUX.2 Flex: black-forest-labs
• Gemini 3 Flash Preview: Google

• FLUX.2 Flex model details, providers and pricing
• Gemini 3 Flash Preview model details, providers and pricing