DeepSeek V4 Flash 0731 and Sakana Namazu 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 $0.03/M tokens input, $0.075/M tokens output on OpenRouter.
Sakana Namazu, from sakana, has a 262,144-token context window and is priced at $0.95/M tokens input, $4/M tokens output on OpenRouter.