GPT-5.6 Terra and Nex-N2-Mini 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.
Nex-N2-Mini, from nex-agi, has a 262,144-token context window and is priced at $0.025/M tokens input, $0.10/M tokens output on OpenRouter.