FLUX.2 Klein 4B vs GPT Image 2: side-by-side summary

FLUX.2 Klein 4B and GPT Image 2 are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

FLUX.2 Klein 4B, from black-forest-labs, has a 40,960-token context window and is priced at $0.014/megapixel on OpenRouter.

GPT Image 2, from OpenAI, has a 400,000-token context window and is priced at $8/M tokens input, $8/M tokens output on OpenRouter.

Context window

• FLUX.2 Klein 4B: 40,960 tokens
• GPT Image 2: 400,000 tokens

Price

• FLUX.2 Klein 4B: $0.014/megapixel
• GPT Image 2: $8/M tokens input, $8/M tokens output

Provided by

• FLUX.2 Klein 4B: black-forest-labs
• GPT Image 2: OpenAI

• FLUX.2 Klein 4B model details, providers and pricing
• GPT Image 2 model details, providers and pricing