Overview
DeepSeek is an open-weight model offering strong capability at a fraction of the cost; ChatGPT is a closed, managed model with the broadest ecosystem and generally a higher capability ceiling at the very top tier.
Key Differences
If cost and open-weight availability (for self-hosting or fine-tuning) matter most, DeepSeek is the stronger choice; if you want the broadest ecosystem and don't mind paying a premium for top-tier capability, ChatGPT has the edge there.
Related Pages
Frequently Asked
Is DeepSeek as capable as ChatGPT?
Increasingly competitive, particularly for the cost, though ChatGPT's top-tier models often still hold a capability edge on the hardest tasks.
Is DeepSeek free?
The model weights are free to download; using it via a hosted API or self-hosting still has some cost, though typically much lower than ChatGPT.
Which is better for coding?
DeepSeek is frequently recommended as a cost-effective coding option — see our Best LLM for Coding roundup.
Where can I find more open-weight alternatives?
See our Best Open Source LLM roundup.