OpenAI: GPT-5.5

GPT-5.5 is a paid model from OpenAI that accepts text, images, and file uploads, making it usable for document-heavy and multimodal workflows. It supports tool use and reasoning, which positions it for agentic tasks. The context window reaches 1,050,000 tokens with up to 128,000 tokens of output per call, so it can handle long documents or extended multi-turn sessions without truncation. On benchmarks, it scores 93.7 blended across four tests, including a perfect score on the coding subset and 74.0 on the agentic benchmark, which is worth noting for teams evaluating autonomous task performance. The output pricing at $30.00 per million tokens is high relative to many alternatives, so this model is a better fit for use cases where quality gains justify the cost rather than high-volume, routine generation. Teams running complex reasoning pipelines or code-generation workflows are the most natural audience.