Compare DeepSeek V4 Flash 0423 from DeepSeek and GPT-5.5 from OpenAI on key metrics including benchmarks, price, context length, and other model features. Access both models and hundreds of others through the OpenRouter API.
DeepSeek V4 Flash 0423 and GPT-5.5 are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
DeepSeek V4 Flash 0423, from DeepSeek, has a 1,048,576-token context window and is priced at $0.05544/M tokens input, $0.1109/M tokens output on OpenRouter.
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.