Qwen3.8 Max and GPT-5.6 Terra are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
Qwen3.8 Max, from Qwen, has a 1,000,000-token context window and is priced at $2/M tokens input, $6/M tokens output on OpenRouter.
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.