GPT Chat Latest and Owl Alpha are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
GPT Chat Latest, from OpenAI, has a 400,000-token context window and is priced at $5/M tokens input, $30/M tokens output on OpenRouter.
Owl Alpha, from OpenRouter, has a 1,048,576-token context window and is priced by the provider serving it on OpenRouter.