Aion-3.0 and LFM2.5-2.6B 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.
LFM2.5-2.6B, from Liquid, has a 131,072-token context window and is priced by the provider serving it on OpenRouter.