This matchup is frontier polish versus open-weight value. GPT-5.2 is OpenAI's most capable model — strong agentic tooling, multimodal reasoning and professional document work, backed by the ChatGPT ecosystem. It's the premium default for teams that want maximum capability and don't mind frontier pricing.
DeepSeek V3.2 takes the opposite approach: a 671B mixture-of-experts model (37B active) with open weights, DeepSeek Sparse Attention and prices that can be 10–50x cheaper than GPT-5.2. It posts strong reasoning and coding scores (~67.8% SWE-bench, ~89% AIME) and can be self-hosted for full control. If your spend is dominated by a single expensive model, benchmarking DeepSeek often reveals large savings for comparable quality on many tasks — though GPT-5.2 still leads at the very top of the difficulty curve.
Which should you choose?
The verdict
Choose GPT-5.2 for the best capability, multimodality and ecosystem. Choose DeepSeek V3.2 to slash costs and gain open-weight control with surprisingly little quality loss on most tasks.
Watch the comparison
ChatGPT vs DeepSeek — video reviews on YouTubeWatch hands-on tests and side-by-side demosFrequently asked questions
Is DeepSeek as good as ChatGPT?
On many reasoning and coding tasks it's remarkably close, at a fraction of the price. GPT-5.2 still leads on the hardest agentic, multimodal and document work.
Can I self-host DeepSeek?
Yes — DeepSeek V3.2 ships open weights on Hugging Face, unlike ChatGPT, which is API-only.