OpenAI: GPT-5 Pro

GPT-5 Pro is OpenAI's latest offering, accepting text, images, and files across a 400,000-token context window with up to 128,000 tokens of output per call. It supports tool use and built-in reasoning, making it suited for multi-step agentic workflows and long-document tasks. Structured output support is unconfirmed based on currently available specifications. At $15 per million input tokens and $120 per million output tokens, this is one of the more expensive options on the market, and there is currently no independent benchmark coverage to validate whether that premium is justified. Buyers who prioritize OpenAI integration, long context, and reasoning capabilities may want to shortlist it, but those comparing cost-to-performance across models should wait for third-party evaluations before committing, since the performance case rests entirely on vendor positioning rather than verified scores.