Aion-3.0 and DeepSeek V4 Flash 0731 are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
Aion-3.0, from Aion Labs, has a 131,072-token context window and is priced at $3/M tokens input, $6/M tokens output on OpenRouter.
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.