Step3 and R1T Chimera are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
Step3, from stepfun-ai, has a 65,536-token context window and is priced by the provider serving it on OpenRouter.
R1T Chimera, from tngtech, has a 163,840-token context window and is priced by the provider serving it on OpenRouter.