OpenAI: GPT-5.2 Pro

GPT-5.2 Pro is a paid model from OpenAI that accepts text, images, and files as input. It offers a 400,000-token context window with a maximum of 128,000 completion tokens, and it supports both tool use and reasoning. Structured output support is unconfirmed based on available data. At $21.00 per million input tokens and $168.00 per million output tokens, this is a premium-tier option, and the output cost in particular is high relative to most alternatives. There is currently no independent benchmark coverage to evaluate its performance against competing models, so buyers cannot rely on published scores to justify the cost. Teams that already have workflows tied to OpenAI's ecosystem and need long-context multimodal processing with tool and reasoning support may find it worth evaluating, but the unproven benchmark standing means the price-to-performance tradeoff should be tested carefully against your own use case before committing.