Claude Opus 4.5 vs FLUX.2 Flex: side-by-side summary

Claude Opus 4.5 and FLUX.2 Flex are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

Claude Opus 4.5, from Anthropic, has a 200,000-token context window and is priced at $5/M tokens input, $25/M tokens output on OpenRouter.

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

Context window

• Claude Opus 4.5: 200,000 tokens
• FLUX.2 Flex: 67,344 tokens

Price

• Claude Opus 4.5: $5/M tokens input, $25/M tokens output
• FLUX.2 Flex: from $0.06/megapixel

Provided by

• Claude Opus 4.5: Anthropic
• FLUX.2 Flex: black-forest-labs

• Claude Opus 4.5 model details, providers and pricing
• FLUX.2 Flex model details, providers and pricing