Compare GPT-5.5 from OpenAI and Phi 4 Mini Instruct from Microsoft on key metrics including benchmarks, price, context length, and other model features. Access both models and hundreds of others through the OpenRouter API.
GPT-5.5 and Phi 4 Mini Instruct are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
GPT-5.5, from OpenAI, has a 1,050,000-token context window and is priced at $5/M tokens input, $30/M tokens output on OpenRouter.
Phi 4 Mini Instruct, from Microsoft, has a 131,072-token context window and is priced by the provider serving it on OpenRouter.