ChatGPT
LLMs
OpenAI's general-purpose chat + GPT-4o
- Pricing
- $20/mo Plus
- Used in
- 1 stack
- Updated
- 2026-05-05
Head-to-head comparison
ChatGPT vs DeepSeek: 2026 comparison
Side-by-side: pricing, category, alternatives, and which AI stacks on aistack.sh use each tool today.
· 2 weeks ago
Quick answer
ChatGPT and DeepSeek are alternatives in the LLMs category. ChatGPT pricing: $20/mo Plus · API $2.50/M tokens. DeepSeek pricing: Free chat · V4 API ~$0.30/$0.50 per M tokens (input/output). DeepSeek is cheaper at the entry tier. ChatGPT ships in 1 tested AI stack on aistack.sh; DeepSeek ships in 1. Pick ChatGPT when you want openai's general-purpose chat + gpt-4o. Pick DeepSeek when you want frontier-grade reasoning at 1/10th the cost.
At a glance
DeepSeek
LLMs
Frontier-grade reasoning at 1/10th the cost
- Pricing
- Free chat
- Used in
- 1 stack
- Updated
- 2026-05-05
Pricing
Where each ships
ChatGPT-only stacks (1)
DeepSeek-only stacks (1)
ChatGPT vs DeepSeek FAQ
Which is cheaper, ChatGPT or DeepSeek?
DeepSeek starts cheaper. ChatGPT pricing: $20/mo Plus · API $2.50/M tokens. DeepSeek pricing: Free chat · V4 API ~$0.30/$0.50 per M tokens (input/output).
What is ChatGPT best for?
OpenAI's general-purpose chat + GPT-4o ChatGPT is categorized as LLMs and appears in 1 tested AI stack on aistack.sh.
What is DeepSeek best for?
Frontier-grade reasoning at 1/10th the cost DeepSeek is categorized as LLMs and appears in 1 tested AI stack on aistack.sh.
Can I use ChatGPT and DeepSeek together?
They are alternatives at the same step, so most stacks pick one or the other. No aistack.sh stack uses both today, though nothing prevents a custom workflow.
What are the alternatives to ChatGPT and DeepSeek?
Beyond each other, ChatGPT's closest alternatives are Claude, Gemini. DeepSeek's closest alternatives are Claude.
Also compared
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