FLUX.2 Flex vs GPT-5 Image: side-by-side summary

FLUX.2 Flex and GPT-5 Image 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.

GPT-5 Image, from OpenAI, has a 400,000-token context window and is priced at $10/M tokens input, $10/M tokens output on OpenRouter.

Context window

• FLUX.2 Flex: 67,344 tokens
• GPT-5 Image: 400,000 tokens

Price

• FLUX.2 Flex: from $0.06/megapixel
• GPT-5 Image: $10/M tokens input, $10/M tokens output

Provided by

• FLUX.2 Flex: black-forest-labs
• GPT-5 Image: OpenAI

• FLUX.2 Flex model details, providers and pricing
• GPT-5 Image model details, providers and pricing