GPT-5.5

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openai multimodal
textimage

A large language model from OpenAI, part of the GPT-5 series, offering advanced reasoning and multimodal capabilities.

context window 1.1M tokens
max output 128K tokens
input price $5 / 1M tokens
output price $30 / 1M tokens
tool-usejson-modevisionstreamingreasoningcode-generationfunction-callingprompt-caching
releasedApr 2026
knowledge cutoffJan 2026
full doc /v1/models/gpt-5.5