Aion-3.0 and Nex-N2-Pro 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.
Nex-N2-Pro, from nex-agi, has a 262,144-token context window and is priced at $0.25/M tokens input, $1/M tokens output on OpenRouter.