DeepSeek's app is free and its API costs a fraction of Claude's; Claude writes better and keeps data out of China. Costs, coding and Claude Code compared.
The two assistants answer different questions. DeepSeek asks how much intelligence you can get for free or nearly free: its chat app costs nothing and its API is among the cheapest anywhere. Claude asks how good an assistant can be for professional work: careful writing, long documents and the strongest coding agent in its class, with business-grade data handling. Both reviews are written from our own use, and the price gap is large enough that many people end up using both.
DeepSeek's app on the web, iOS and Android is free, with its current V4.1-Flash model, DeepThink reasoning, web search and file uploads. There is no paid tier; the only limit is throttling at busy times.
Claude's free plan includes Sonnet and Haiku with tighter limits. Pro at $20 a month, or $17 billed yearly, adds Opus 5.5, Fable 5.1 on a smaller allowance, Claude Code for terminal-based development and Cowork for multi-step knowledge work. Max costs $100 or $200 for five or twenty times Pro's usage, and Anthropic does not publish its limits as fixed numbers.
| Model, per 1M tokens | Input | Output | 10M input + 2M output a month |
|---|---|---|---|
| deepseek-flash, off-peak | $0.15 | $0.60 | $2.70 |
| deepseek-flash, peak | $0.30 | $1.20 | $5.40 |
| Claude Haiku 4.5 | $1 | $5 | $20 |
| Claude Sonnet 5 | $2 | $10 | $40 |
| Claude Opus 5.5 | $4 | $20 | $80 |
| Claude Fable 5.1 | $10 | $50 | $200 |
DeepSeek prices from its API docs, screenshot taken October 1, 2026; Claude prices from our Claude review, checked September 24. Both offer discounts for cached input, and Anthropic's Batch API halves its rates.
Caching widens DeepSeek's lead: repeated input costs $0.006 per million at peak, a fiftieth of the uncached price, and DeepSeek's off-peak hours, which cover weekends entirely, halve everything again. For a startup running millions of classification or summarization calls, that difference decides the architecture. For a developer paying for a few hours of agent work a day, Claude's Pro and Max subscriptions usually cost less than the equivalent API usage on Claude models.
Claude Code is the reason many developers pay for Claude. It works through a repository from the terminal, plans changes, edits files and runs commands, and on Pro and Max it is included in the subscription. Our Claude review describes a full audit of this site's repository by Claude Code running Opus 5.5 in one session.
DeepSeek has two answers. Its own agent, DeepSeek Harness, offers a web interface and desktop app that read and edit workspace files, run commands and keep a plan. And because DeepSeek's API speaks the Anthropic format, its documentation shows how to point Claude Code itself at deepseek-flash by changing the base URL. That combination gives you Anthropic's agent workflow at DeepSeek's token prices, with two costs: your code goes to DeepSeek's servers, and you trade Opus-level judgment on large codebases for a cheaper model.
In our hands-on use, DeepSeek held up against paid assistants on maths, logic puzzles and structured coding problems, and its visible reasoning makes it easy to see where an answer went wrong. Its 1M-token context handles long documents and large chunks of code. Long creative writing was competent rather than distinctive.
Claude's strengths run the other way: long-context reasoning across documents, extended writing with a consistent voice, and careful analysis, which is why it is the assistant we use for research and writing on this site. For drafting a report, editing a long document or working through an argument, Claude is the stronger tool; for checking a calculation or a tricky function for free, DeepSeek is often enough.
DeepSeek is a Chinese company, and data sent to its app or API is processed under Chinese jurisdiction. That is fine for learning and personal projects and disqualifying for client data, regulated information or code under NDA. Its open weights change the picture for companies: V4.1-Flash is on Hugging Face, so it can run on your own hardware or with a provider you trust, though a 552-billion-parameter model needs serious GPU capacity.
Claude has no open weights, but it is available through Anthropic, Amazon Bedrock, Google Vertex AI and Microsoft Foundry, with business plans for teams. For most professional use, that makes Claude the default and self-hosted DeepSeek the specialist option.
| If you | Choose | Why |
|---|---|---|
| Want a capable assistant without paying | DeepSeek | Free app with reasoning and search |
| Write reports, documents or long-form content | Claude | Stronger writing and long-context analysis |
| Code daily with an agent on real projects | Claude | Claude Code with Opus 5.5 in Pro or Max |
| Run high-volume API workloads on a budget | DeepSeek | A fraction of Claude's per-token price |
| Want Claude Code's workflow at the lowest cost | DeepSeek via Claude Code | Anthropic-format API, if your code can leave your jurisdiction |
| Handle client or regulated data | Claude | Business plans and Western cloud availability |
| Need weights you can host yourself | DeepSeek | V4.1-Flash is open |
Claude takes the verdict for professionals because it does the work most people pay an assistant for, writing, analysis and agentic coding, better and with data handling businesses can sign off on. DeepSeek is the best free assistant for technical questions and the cheapest serious API, and running both is easy since one side costs nothing. For a broader assistant with images and voice, look at ChatGPT; for cited web research, Perplexity; and for AI inside a code editor, Cursor.
Not as an overall coding partner. Claude, especially through Claude Code with Opus 5.5, is the more capable and polished agent for real codebases. DeepSeek's V4.1-Flash handles structured coding, debugging and maths well for free in its app, and costs far less per token on the API, which makes it attractive for high-volume or budget work.
Yes. DeepSeek's API accepts Anthropic-format requests, and its documentation shows how to set Claude Code's Anthropic base URL to api.deepseek.com/anthropic with deepseek-flash as the model. You then pay DeepSeek's per-token prices instead of using a Claude subscription, but your code goes to DeepSeek's servers and you lose Anthropic's models.
Roughly seven to fifteen times cheaper on a typical workload. A month of 10 million input and 2 million output tokens costs about $5.40 on deepseek-flash at peak or $2.70 off-peak, against about $40 on Claude Sonnet 5 and $80 on Claude Opus 5.5, before caching and batch discounts.
In the apps, mostly yes. DeepSeek's chat app is free with no paid tier. Claude has a free plan with Sonnet and Haiku, but Opus, higher limits, Claude Code and Cowork come with Pro at $20 a month ($17 billed yearly) or Max at $100 or $200.
Claude, for hosted use. DeepSeek is a Chinese company, so data sent to its app or API is processed under Chinese jurisdiction, which rules it out for client data or code under NDA. Anthropic offers business plans and is available through AWS, Google Cloud and Microsoft. DeepSeek's open weights can be self-hosted to avoid the issue.
No. Claude models are available only through Anthropic's apps and API and through cloud platforms such as Amazon Bedrock, Google Vertex AI and Microsoft Foundry. DeepSeek publishes the weights of V4.1-Flash on Hugging Face, so you can run it on your own hardware.