Hermes 4 70B and GPT-5.6 Sol are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
Hermes 4 70B, from Nous Research, has a 131,072-token context window and is priced at $0.13/M tokens input, $0.40/M tokens output on OpenRouter.
GPT-5.6 Sol, from OpenAI, has a 1,050,000-token context window and is priced at $2.50/M tokens input, $15/M tokens output on OpenRouter.