Grok 4.6 and Gemini 3.6 Flash are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
Grok 4.6, from SpaceXAI, has a 500,000-token context window and is priced at $2/M tokens input, $6/M tokens output on OpenRouter.
Gemini 3.6 Flash, from Google, has a 1,048,576-token context window and is priced at $1.50/M tokens input, $7.50/M tokens output on OpenRouter.