GPT-5.2 Pro (OpenAI)

GPT-5.2 Pro is OpenAI's premium reasoning model in the gpt-pro family, positioned as a multimodal system aimed at coding, software engineering, and agent workflows where accuracy and control matter. Independent listings describe it as combining large-context reasoning with vision input and tool use, suiting tasks that require deep step-by-step thinking over long inputs. The model is publicly available with active pricing and is explicitly framed around developer-facing and agentic use cases rather than casual chat or content generation.

On the technical side, the model operates with a 400,000-token context window and uses the tiktoken-o200k tokenizer, with a maximum reply length of 128,000 tokens. Public quality benchmarks reported by third-party trackers include MMLU at 87.4, GPQA Diamond at 90.3, and FrontierMath Tier 4 at 31.3, indicating strong general knowledge and graduate-level reasoning alongside a still-difficult frontier math score. Pricing reflects its premium tier at $21.00 per million input tokens and $168.00 per million output tokens, with discounted cache and batch rates available, making it best suited for teams that need reliable long-context reasoning on high-stakes engineering and agent tasks rather than high-volume, low-cost generation.