GPT-5.2 Pro

OpenAI introduced GPT-5.2 on December 11, 2025, as its most capable model series for professional knowledge work and long-running agents. The launch explicitly names GPT-5.2 Instant, Thinking, and Pro as three tiers rolling out in ChatGPT starting with paid plans, with all variants also available in the API on the same day. The release targets spreadsheets, presentations, code, image perception, long context, tool use, and complex multi-step projects. GPT-5.2 Thinking sets new state-of-the-art results on benchmarks including GDPval (70.9% wins or ties vs GPT-5's 38.8%), SWE-Bench Verified (80.0%), GPQA Diamond (92.4%), AIME 2025 (100%), and ARC-AGI-2 (52.9% vs 17.6%). Partners such as Notion, Box, Shopify, Harvey, Zoom, Databricks, Cognition, JetBrains, and Augment Code report state-of-the-art long-horizon reasoning, agentic coding, and tool-calling performance.

Eden AI published a first-party comparison post on May 22, 2026 ranking the top 15 LLMs in 2026 across MMMU-Pro, GPQA, and SWE-bench Verified benchmarks. The article highlights GLM-5 as the top model for complex systems engineering and long-horizon agentic tasks, while framing Eden AI as a unified API gateway that stan While the excerpt does not explicitly name the edenai/openaigpt-52-pro slug, the post establishes the platform-level context relevant to any developer evaluating Eden AI's GPT-5.2 Pro endpoint: a single gateway abstraction over multiple frontier models with built-in cost and performance optimization. The comparison met