DeepSeek V4 Flash 0731 and DeepSeek V4 Pro 0813 are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
DeepSeek V4 Flash 0731, from DeepSeek, has a 1,310,720-token context window and is priced at $0.045/M tokens input, $0.09/M tokens output on OpenRouter.
DeepSeek V4 Pro 0813, from DeepSeek, has a 1,048,576-token context window and is priced at $1.119/M tokens input, $3.358/M tokens output on OpenRouter.