Disclosure: LabFin is reader-supported. If you sign up for a tool through links on this page, we may earn a commission at no extra cost to you. Commissions vary between providers and our ratings do not — here’s our full disclosure.
Claude vs DeepSeek is a lopsided match on the independent boards. Claude’s Opus 5.5 scores 58 on Artificial Analysis’s Intelligence Index against 39 for DeepSeek V4.1 Flash, and leads every board here. DeepSeek’s app is free, its newest model is open-weight, and its privacy policy says it stores personal data in China.
Our reviews score Claude 3.6 and DeepSeek 3.0. The sections below compare price, models, accuracy, data and who each one suits.
Claude vs DeepSeek: The Short Answer
Choose Claude for work, writing, coding and private material; choose DeepSeek for free, low-stakes use or self-hosting. Claude Pro costs $20 a month or $200 a year and shows no ads. DeepSeek’s app costs nothing, and its API starts at $0.15 per million input tokens off-peak.
The accuracy gap is large. On Artificial Analysis’s knowledge index, Opus 5.5 scores 46 and DeepSeek V4.1 Flash minus 5.3. V4.1 Flash declined only 4% of the questions it could not answer.
Head to Head
| Criterion | Claude | DeepSeek |
|---|---|---|
| Price | Free; Pro $20/mo or $200/yr | Free app; no paid consumer plan |
| API, cheapest rate | Billed separately | $0.15 per 1M input tokens, off-peak |
| Open weights | None in our sources | V4.1 Flash, downloadable |
| Where data is stored | Anthropic, a US company | People’s Republic of China |
| Ads | None on any plan | No targeted advertising, per policy |
| AA Intelligence Index | 58 (Opus 5.5) | 39 (V4.1 Flash) |
| Arena text rank (Sep 30) | 4th (claude-opus-5.5-high) | 40th (deepseek-v4.1-flash-max) |
| Our score | 3.6 | 3.0 |
Price and Plans
DeepSeek’s consumer app on the web, iOS and Android is free, and there is no paid consumer tier. Paid use goes through its API, priced from $0.15 per million input tokens and $0.60 per million output tokens off-peak for V4.1 Flash.
Claude Free costs nothing, Pro costs $20 a month or $200 a year, and Max costs $100 or $200 a month. Free runs Sonnet and Haiku models, while Pro adds Opus 5.5, Research and Claude Code.
What the Independent Boards Show
Claude leads on every board here. Artificial Analysis gives Opus 5.5 58 on its Intelligence Index and DeepSeek V4.1 Flash 39. Arena’s text board of September 30, 2026 had claude-opus-5.5-high fourth, deepseek-v4.1-flash-max 40th and DeepSeek’s V4 Pro 54th.
For coding, Claude Code with Sonnet 5.5 scores 68 on Artificial Analysis’s Coding Agent Index. DeepSeek V4 Pro running inside Codex scored 43.1, according to BenchLM’s mirror of the index, as our list of the best AI for coding covers.
On admitting unknowns, the gap is widest. DeepSeek V4.1 Flash’s non-hallucination rate was 4%, and its AA-Omniscience index minus 5.3, against 46 for Opus 5.5. A 59% hallucination rate reported for Opus 5.5 comes from a third-party reading we could not confirm, but even that would sit well below DeepSeek’s 96%.
Where Your Data Goes
DeepSeek stores your data in China. Its privacy policy, updated on February 10, 2026, says it collects, processes and stores personal data in the People’s Republic of China. It keeps chat data as long as the account exists and allows sharing with authorities to comply with legal requests.
Both train on consumer chats by default and both offer an opt-out. With Claude’s Help improve Claude on, Anthropic keeps chats for five years, and its Incognito chats stay out of training. DeepSeek’s opt-out is a setting called Improve the model for everyone.
⚠️ Several governments restrict DeepSeek. Italy blocked the app in January 2025, Australia banned it from government devices, and the Czech Republic barred its public administration, Reuters reported. Check your employer’s policy before using it for work.
Self-Hosting and the API
DeepSeek’s open weights let developers run V4.1 Flash on their own servers, which keeps prompts away from DeepSeek. Its API news page says V4 Pro is available in the app through Expert Mode, and that its API offers one-click setup for Codex.
Claude’s models run through Anthropic’s own apps and API. On Team and Enterprise plans and through the API, Anthropic does not train on your data by default, as our guide to Claude for coding explains.
Where Each One Is Weakest
Claude is weakest on price. Its stronger models need Pro at $20 a month, it publishes no message counts, and with training on it keeps chats five years. Claude Code is not on the free plan.
DeepSeek is weakest on data and accuracy. Your chats are stored in China, several governments restrict the app, and its model guesses on almost every question it cannot answer.
Winners by Category
Price: DeepSeek, free in the app. Open weights: DeepSeek, with V4.1 Flash downloadable. Intelligence index: Claude, 58 against 39. Knowledge and admitting unknowns: Claude, 46 against minus 5.3. Arena text board: Claude, fourth against 40th. Coding agents: Claude, 68 against 43.1. Ads: roughly a tie, with none on Claude and no targeted ads at DeepSeek. Data location and workplace use: Claude.
When to Choose DeepSeek Instead
Take DeepSeek for free, low-stakes chat, cheap API work or self-hosting its open weights. Keep personal, client and work data out of the app.
Take Claude for anything private, for writing and coding, or when your employer restricts Chinese apps. For DeepSeek against ChatGPT, see our ChatGPT vs DeepSeek comparison, and for other options, our list of Claude alternatives.
How We Research
This comparison reuses the sources behind our Claude review and our DeepSeek review, rechecked on October 1, 2026. Claude prices come from claude.com/pricing, and rankings from Arena and Artificial Analysis, each dated where used.
Both scores come from the same five criteria, applied to each tool in its own review. We run no tests of our own. The criteria behind every score live on our about page.
Claude vs DeepSeek FAQ
Claude scores 3.6 in our reviews and DeepSeek 3.0. Claude leads on every independent board here; DeepSeek is free and open-weight.
Yes. The app on the web, iOS and Android is free with no paid consumer plan. Only the API costs money.
It stores personal data in China and may share it with authorities under legal requests, and several governments restrict it on official devices. Check your employer’s policy first.
Claude, on Artificial Analysis’s knowledge index: 46 for Opus 5.5 against minus 5.3 for DeepSeek V4.1 Flash, which declined only 4% of questions it could not answer.
Yes, by self-hosting the open V4.1 Flash weights, which keeps prompts away from DeepSeek. The model is large and needs server-class hardware.
The Verdict
Claude vs DeepSeek goes to Claude, 3.6 to 3.0 on our scores. Claude leads on every board, on coding and on data location. DeepSeek wins on price and open weights.
Use DeepSeek only for material you would not mind being stored in China, or self-host its weights. On either one, turn off training before you paste anything private. Our page on Claude vs Gemini covers independent scores against Gemini’s price, storage and Google apps.