DeepSeek vs ChatGPT: an honest comparison from someone who uses both

DeepSeek vs ChatGPT: the short answer

For everyday use — emails, plans, explanations, general questions — the two are closer than most people expect. ChatGPT wins on polish and specialist capability. DeepSeek wins on cost. I use both daily; this is not a marketing comparison.

How the quality compares

On general conversation and drafting, I cannot reliably tell the difference in blind use. On genuinely hard problems, ChatGPT's premium models still pull ahead. The honest framing is this: DeepSeek covers 90% of what most people do with a chatbot, for a few percent of the cost.

What that cost difference buys you

ChatGPT's premium tiers start around $8–20 a month. Running equivalent open models costs pennies per conversation. That gap is structural, not promotional — it comes from open weights and cheap inference, and it is not going away.

It is also why Plainly can exist: unlimited chat at $5 a month, with the model handled automatically.

Which should you choose?

• You want the best possible answer, whatever it costs: ChatGPT Plus.
• You want everyday help without a subscription you resent: a cheap alternative built on open models. If you want zero decisions, that is Plainly.
• You are technical and want control: DeepSeek directly.

Fair warning: if your daily usage is heavy and specialist, no cheap alternative fully replaces a premium subscription yet. For everyone else, the value case is not close.