MiniMax M2-her and Step 3.5 Flash are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
MiniMax M2-her, from MiniMax, has a 65,536-token context window and is priced at $0.30/M tokens input, $1.20/M tokens output on OpenRouter.
Step 3.5 Flash, from stepfun, has a 262,144-token context window and is priced at $0.10/M tokens input, $0.30/M tokens output on OpenRouter.