Compare GPT-5.6 Terra from OpenAI and Gemini 3.5 Flash from Google on key metrics including benchmarks, price, context length, and other model features. Access both models and hundreds of others through the OpenRouter API.
GPT-5.6 Terra and Gemini 3.5 Flash 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.
Gemini 3.5 Flash, from Google, has a 1,048,576-token context window and is priced at $1.50/M tokens input, $9/M tokens output on OpenRouter.