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VERDICT

Should I use DeepSeek | 深度求索?

深度求索（DeepSeek），探索未至之境。专注于研究世界领先的通用人工智能底层模型与技术，开源 DeepSeek-V4、DeepSeek-R1 等前沿大模型。和 DeepSeek AI 对话，轻松接入 API。 - deepseek.com

Depends. Buy if you are a developer who wants cheap, open-weight frontier models via API and can tolerate flaky support. Avoid if you handle sensitive or regulated data — leak history, CVEs, and country bans say so.

Confidence

Medium. Based on 14 public sources across reviews, security, pricing, and company news; many source snippets were truncated, which limits verbatim quotes.

Ratings

  • Value for money
  • Ease of use
  • Feature depth
  • Support quality
  • Security posture

Pricing

Free

Chat app

ModelNot disclosed
Monthly feesNot disclosed
HardwareNot disclosed
Free tierYes
APIUsage-based, per 1M tokens

Best for

  • Cost-sensitive developers using APIs
  • Long-document, million-token workloads
  • Teams self-hosting open weights
  • Researchers and tinkerers

Not for

  • Regulated industries handling sensitive data
  • Anyone needing support SLAs or vendor accountability
  • Production deployments without a security review
  • Non-technical users wanting a polished assistant

Gotchas - check before you buy

high

CVE-2026-82533 sandbox escape affects DeepSeek Harness agent deployments — avoid or patch.

medium

Off-peak discount pricing shifts often; third-party trackers report stale official rates.

medium

Reddit users balked at post-hike '$4' pricing; verify current rates before committing.

medium

Free chat app is often congested; users resort to third-party mirrors.

Pros and cons

Pros

  • Open-source frontier models (V4, R1) you can self-host
  • Million-token context handles very long documents
  • Strong real-code performance in independent testing
  • Historically the cheapest frontier-tier API on the market
  • Broad availability: Azure, AWS Marketplace, and integrators offer it

Cons

  • API prices jumped roughly 4× starting August 16, 2025
  • Support requests reportedly go unanswered
  • Frequent server-busy congestion at peak times
  • NIST CAISI evaluation found security shortcomings and risks
  • Past leak exposed 1,000,000 sensitive records

Sources & method

Analyzed 9/25/2026 - 14 sources - Multiple CVEs, a past million-record leak, NIST-cited shortcomings, and several country bans; no security page found on the site.

official x2review x5security x4news x3
  • CVE-2026-82533 — DeepSeek Harness sandbox escape, Sandbox escape / auth bypass in DeepSeek Harness lets AI agents break isolation; flagged by OX Security and Cloud Security Alliance.
  • CVE-2026-55604 — DeepSeek MCP Server, Vulnerability in DeepSeek MCP Server tracked by NIST NVD.
  • Data leak of 1,000,000 sensitive records, Forbes reported an exposed DeepSeek database in February 2025; prior cyber attack also exposed data.
  • NIST CAISI evaluation flagged risks, NIST's CAISI found security shortcomings; the best U.S. model outperformed DeepSeek models evaluated.

Key stats

  • Value for money: 4/5

    Rating

  • Free

    Starting price

  • 14

    Sources

  • Analyzed

  • Value for money: 4/5. Still cheap versus rivals, but hikes eroding it
  • Ease of use: 3/5. Simple app, frequent server-busy complaints
  • Feature depth: 4/5. Million-token context, reasoning models, open weights
  • Support quality: 1/5. Reported unanswered support requests (Cursor forum)
  • Security posture: 1/5. CVEs, past leak, NIST findings, country bans
  • 210+ User reviews aggregated by CheckThat
  • 4× higher API pricing trend since Aug 16, 2025
  • ¥51B Funding round Tencent-led, June 2026
  • Yes Free tier web/app chat is free

Pricing

Chat app

Free

  • Web and mobile chat with DeepSeek models
  • Deep-thinking (R1) and web-search modes

API

Usage-based, per 1M tokens

  • DeepSeek-V4 and V4-Flash models
  • Off-peak hour discounts
  • Rates roughly 4× higher since Aug 16, 2025

Security

Multiple CVEs, a past million-record leak, NIST-cited shortcomings, and several country bans; no security page found on the site.

  • CVE-2026-82533 — DeepSeek Harness sandbox escapeSandbox escape / auth bypass in DeepSeek Harness lets AI agents break isolation; flagged by OX Security and Cloud Security Alliance.13
  • CVE-2026-55604 — DeepSeek MCP ServerVulnerability in DeepSeek MCP Server tracked by NIST NVD.
  • Data leak of 1,000,000 sensitive recordsForbes reported an exposed DeepSeek database in February 2025; prior cyber attack also exposed data.11
  • NIST CAISI evaluation flagged risksNIST's CAISI found security shortcomings; the best U.S. model outperformed DeepSeek models evaluated.12

What users say

Users praise capability and low cost but complain about server congestion, sudden price hikes, and thin support.

“DeepSeek V4 is the best”
Thomas Wiegold, independent review

Alternatives

Compare DeepSeek | 深度求索 with each alternative.

  • ChatGPT

    Polished mainstream assistant; bigger ecosystem, stricter enterprise controls

  • Claude

    Guess: strong coding assistant with tighter enterprise security posture

    DeepSeek | 深度求索 vs Claude

  • Azure AI Foundry (DeepSeek hosting)

    Same DeepSeek models behind Azure contracts and compliance

  • Google Gemini

    Guess: comparable long-context models with enterprise compliance

Companies that use it

  • Cursor⁷
  • Microsoft (Azure AI Foundry)
  • AWS (Marketplace listing)
  • BerriAI (LiteLLM)
Full analysis

Based on 14 public sources across reviews, security, pricing, and company news; many source snippets were truncated, which limits verbatim quotes.

Great cheap open-weight AI models for builders; real security flags and weak support make it wrong for sensitive data.

Methodology

Based on 14 public sources across reviews, security, pricing, and company news; many source snippets were truncated, which limits verbatim quotes.

Sources

  1. DeepSeek | Into the Unknowndeepseek.com
    official
  2. Models & Pricing | DeepSeek API Docsapi-docs.deepseek.com
    official
  3. DeepSeek Reviews: What 210+ Users Actually Thinkcheckthat.ai
    review
  4. DeepSeek V4 Review: I Tested It on Real Codethomas-wiegold.com
    review
  5. Has anyone used DeepSeek? Is it actually worth it? (Reddit)reddit.com
    review
  6. G2 — DeepSeek Reviewsg2.com
    review
  7. Deepseek Unavailable! No Response from Customer Support (Cursor forum)forum.cursor.com
    review
  8. DeepSeek's AI models are about to cost four times more (Engadget)engadget.com
    news
  9. Three reasons why DeepSeek's new model matters (MIT Tech Review)technologyreview.com
    news
  10. DeepSeek 510亿融资背后：腾讯领投 (Tencent-led funding)news.qq.com
    news
  11. DeepSeek Data Leak Exposes 1,000,000 Sensitive Records (Forbes)forbes.com
    security
  12. CAISI Evaluation of DeepSeek AI Models (NIST)nist.gov
    security
  13. CVE-2026-82533: DeepSeek Harness Auth Bypass (SentinelOne)sentinelone.com
    security
  14. Experts Flag Security, Privacy Risks in DeepSeek AI App (KrebsOnSecurity)krebsonsecurity.com
    security

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