DeepSeek vs ChatGPT in 2026

DeepSeek moved to the V4 line with 1M-token context and released DeepSeek-V4.1-Flash-1017 with open weights in October 2026; ChatGPT moved to GPT-6 Sol and GPT-6 Luna.

Updated Oct 26, 2026 · 10 sources checked

The short answer

Choose ChatGPT for the most complete, polished assistant with images, voice and strong privacy controls on business plans.

Pick DeepSeek for free chat, and developers who want cheap or self-hosted open-weight models

Pick ChatGPT for all-round everyday use: chat, image generation, voice and coding with Codex in one app

At a glance

	DeepSeek	ChatGPT
Made by	DeepSeek	OpenAI
Starts at	Free	$8/moFree plan
All plans	Free web chat and app + pay-per-token API (priced in CNY; off-peak rates are half the peak rate)	Free + Go $8/mo + Plus $20/mo + Pro $100, $200 or $500/mo; Business $25/user/mo ($20 billed yearly)
Best for	Free chat, and developers who want cheap or self-hosted open-weight models	All-round everyday use: chat, image generation, voice and coding with Codex in one app

How they score

DeepSeekChatGPT

Coding

8.5

Writing

7.5

8.5

Reasoning

8.5

Speed

8.5

Context Window

8.5

Privacy

Scores out of 10: our judgment from hands-on use and each vendor's published limits.

DeepSeek

by DeepSeek

Chinese AI lab with a free chat app. Its API serves DeepSeek-V4.1-Flash-1017 (released October 2026 with open weights) and DeepSeek-V4-Pro, both with a 1M-token context window.

Good

Mobile app is free to use
Open weights for DeepSeek-V4.1-Flash-1017 on Hugging Face
1M-token context window and up to 384K output tokens on the API
API is compatible with the OpenAI and Anthropic SDKs, so it plugs into Claude Code, Codex and others
Off-peak API pricing is half the peak price

Watch out

Personal data is stored in the People's Republic of China, per its privacy policy
Fewer built-in tools and integrations than ChatGPT
API prices are listed in CNY and change between peak and off-peak hours

Visit DeepSeek ↗

ChatGPT

by OpenAI

OpenAI's AI assistant. Since October 7, 2026 it runs GPT-6 Sol on Plus, Pro, Business and Enterprise and GPT-6 Luna on Free and Go. GPT-6 Astra and GPT-6.1 Sol are available in Codex on Plus and higher.

Good

One app covers chat, image generation (ChatGPT Images 2.5 on every plan), voice and coding (Codex)
GPT-6 Sol on every plan from Plus ($20/mo) up
Go plan at $8/mo is a cheap step up from Free
Three Pro tiers ($100, $200, $500) let heavy users buy more usage without switching tools
Largest ecosystem of custom GPTs and third-party integrations

Watch out

Free and Go run the smaller GPT-6 Luna model
The Go plan may show ads
The strongest models (GPT-6 Astra, GPT-6.1 Sol) are in Codex and ChatGPT Work, not regular chat
Five consumer plans plus three Pro prices make the lineup hard to compare

Visit ChatGPT ↗

Our verdict

Choose ChatGPT for the most complete, polished assistant with images, voice and strong privacy controls on business plans. Choose DeepSeek if you want a capable free chat app or very cheap, open-weight models for development, and you are comfortable that personal data is stored in China.

Questions people ask

Is DeepSeek safe to use?

DeepSeek's privacy policy says it collects, processes and stores personal data in the People's Republic of China. Avoid putting sensitive or work data into the hosted app; developers can self-host the open weights instead.

Is DeepSeek free?

DeepSeek says its app is free to use. The API is billed per token, and off-peak rates are half the peak rate.

Is DeepSeek better than ChatGPT?

For free chat and cheap API use, DeepSeek is strong value. For an all-in-one assistant with images, voice and coding tools, ChatGPT is the better product.

Can I run DeepSeek locally?

Yes. DeepSeek-V4.1-Flash-1017 weights are on Hugging Face and ModelScope, though running it needs serious GPU hardware.

Sources (10), checked Oct 26, 2026