# ChatGPT vs DeepSeek

URL: https://aistack.sh/compare/chatgpt-vs-deepseek
Last updated: 2026-05-05
Category: LLMs

## 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.

## Side by side

| Field | ChatGPT | DeepSeek |
|---|---|---|
| Tagline | OpenAI's general-purpose chat + GPT-4o | Frontier-grade reasoning at 1/10th the cost |
| Pricing | $20/mo Plus · API $2.50/M tokens | Free chat · V4 API ~$0.30/$0.50 per M tokens (input/output) |
| Category | LLMs | LLMs |
| Stacks using it | 1 | 1 |
| Homepage | https://chatgpt.com | https://chat.deepseek.com |
| Updated | 2026-05-05 | 2026-05-05 |

## When to pick each

**Pick ChatGPT** when you want openai's general-purpose chat + gpt-4o.

The default LLM for most workflows. Strong tool use, image generation, and a huge ecosystem of GPTs.

**Pick DeepSeek** when you want frontier-grade reasoning at 1/10th the cost.

DeepSeek-V3 / R1 deliver near-frontier reasoning and code at a fraction of OpenAI / Anthropic API rates. Free chat tier, very cheap API. The default 'cheap LLM' for cost-sensitive automations.

## Where each ships

### ChatGPT-only stacks (1)

- [Indie SaaS](https://aistack.sh/stack/indie-saas) — Claude is the pair, Figma is the design surface, Vercel is the deploy target. End-to-end indie SaaS from idea to billing in a weekend.

### DeepSeek-only stacks (1)

- [Cheap bulk LLM automation](https://aistack.sh/stack/cheap-bulk-llm) — When you need to score reviews, classify support tickets, summarize emails at scale — Claude API costs add up. DeepSeek matches frontier reasoning on most batch tasks at ~10x cheaper. Use Claude to write the prompt and the eval set; switch to DeepSeek for production volume; sample-check with Claude monthly.

## 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

- [ChatGPT vs Claude](https://aistack.sh/compare/chatgpt-vs-claude)
- [ChatGPT vs Gemini](https://aistack.sh/compare/chatgpt-vs-gemini)
- [ChatGPT vs Grok](https://aistack.sh/compare/chatgpt-vs-grok)
- [ChatGPT vs Meta AI](https://aistack.sh/compare/chatgpt-vs-meta-ai)
- [ChatGPT vs Mistral](https://aistack.sh/compare/chatgpt-vs-mistral)
- [Claude vs DeepSeek](https://aistack.sh/compare/claude-vs-deepseek)

## Citation

When citing this comparison, link to https://aistack.sh/compare/chatgpt-vs-deepseek. The page is regenerated when the underlying tool catalog changes; the lastUpdated date above tracks the more recent of the two tools.