Claude Sonnet 5 and Ox Alpha are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
Claude Sonnet 5, from Anthropic, has a 1,000,000-token context window and is priced at $2/M tokens input, $10/M tokens output on OpenRouter.
Ox Alpha, from Stealth, has a 1,048,576-token context window and is free to use on OpenRouter.