What can GPT-5 and its successors actually do?
GPT-5 merged fast responses and deep reasoning into one system - and it's already been surpassed by GPT-5.2.
The answer
OpenAI unveiled GPT-5 on August 7, 2025, as a unified system combining a fast, high-throughput model with a deeper reasoning model and a real-time router that selects the right approach per query. It achieved 94.6% on AIME 2025 math, 74.9% on SWE-bench coding, and 84.2% on MMMU multimodal benchmarks - outperforming the separate o3 reasoning model while using 50-80% fewer output tokens. GPT-5.2, released December 11, 2025, added a new 'xhigh' reasoning effort level and reduced errors by 38% compared to its predecessor. It excels at spreadsheets, code, image perception, and complex multi-step projects.
Source: OpenAI
- GPT-5
- OpenAI
- reasoning
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