GPT-5.6 Terra and North Mini Code are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
GPT-5.6 Terra, from OpenAI, has a 1,050,000-token context window and is priced at $2/M tokens input, $12/M tokens output on OpenRouter.
North Mini Code, from Cohere, has a 256,000-token context window and is priced by the provider serving it on OpenRouter.