On the API, the gap is almost comical. DeepSeek runs about $0.35–0.40 per million tokens; Claude Opus and GPT-5.5 are around $5. Processing 10 million tokens a day costs roughly $63/month on a DeepSeek flash model versus $2,700/month on Claude Sonnet 4.5. That's not a discount, it's a different order of magnitude.
For the consumer app it's simpler still: DeepSeek's chat is completely free, reasoning mode included, no paid tier at all. ChatGPT and Claude give you a capable free tier but gate the best models and the real limits behind $20/month.
| Chat app | API (rough) | Weights | |
|---|---|---|---|
| DeepSeek | free, no paid tier | ~$0.35/1M tokens | released, MIT license |
| ChatGPT | free + $20 Plus + $200 Pro | ~$1.75 in / $14 out per 1M (GPT-5.2) | closed |
| Claude | free + $20 Pro + $100/$200 Max | ~$5/1M (Opus) | closed |
So what does the 10x–100x premium buy? Consistency at the frontier, mostly — the closed models still edge DeepSeek on the hardest reasoning, agentic tasks, and long-context reliability, and both OpenAI and Anthropic ship a deeper product layer (voice, image gen, artifacts, the Claude Code and Codex agents). DeepSeek gives you a raw, very good, very cheap model and releases the actual weights under a permissive license, so you can run it on your own hardware and never pay a token fee.
If you're a developer building something token-hungry — batch processing, classification, a high-volume chatbot — DeepSeek's API is a genuine budget unlock and worth benchmarking against your real workload. If you're an individual who wants a good free assistant, DeepSeek's app is free and unusually capable. Pay for ChatGPT or Claude when you specifically need frontier reasoning you can rely on, or the surrounding tools — and even then, DeepSeek is worth keeping in the mix for the cheap bulk work.