Overview
FLUX.2 Flex vs GPT-5.1-Codex: side-by-side summary
FLUX.2 Flex and GPT-5.1-Codex 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, is priced from $0.06/megapixel on OpenRouter.
GPT-5.1-Codex, 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
- FLUX.2 Flex: Not applicable
- GPT-5.1-Codex: 400,000 tokens
- Price
- FLUX.2 Flex: from $0.06/megapixel
- GPT-5.1-Codex: $1.25/M tokens input, $10/M tokens output
- Provided by
- FLUX.2 Flex: black-forest-labs
- GPT-5.1-Codex: OpenAI