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AI Playbook

DeepSeek: Cost Leader & Open-Weight AI

📖 3 min read deepseekopen-sourceapiplatform
Complete guide to DeepSeek — the cost-leading, open-weight AI platform with dual API compatibility, agent integrations, thinking mode, and open-source models.
Key Takeaways
  • DeepSeek V4 Flash is the cost leader: $0.14/$0.28 per 1M tokens (cache hits at $0.0028). 10-100x cheaper than frontier closed models
  • Dual API compatibility: drop-in replacement for BOTH OpenAI and Anthropic SDKs — no code changes needed
  • Agent integrations: works as backend for Claude Code, GitHub Copilot, OpenCode, and 15+ other coding agents
  • Open-weight models (MIT license): download and self-host V4 Flash and Pro

DeepSeek (founded 2023, Hangzhou) has reshaped the AI industry with a simple proposition: frontier-quality models at 10-100x lower cost, with open-weight access and dual API compatibility.

How the Ecosystem Connects

flowchart LR
    A["DeepSeek Models\nV4 Pro · V4 Flash · R1"] --> B["API Access\nOpenAI Format · Anthropic Format\nThinking Mode · Tool Calls"]
    B --> C["Agent Integrations\nClaude Code · Copilot · OpenCode\n15+ coding agents"]
    A --> D["Open-Weight\nHuggingFace · Ollama\nMIT License"]
    B --> E["Chat\nchat.deepseek.com\nFree tier"]

Product Directory — At a Glance

ProductWhat It IsWho It’s ForCost
DeepSeek V4 ProMost capable model with thinking modeComplex reasoning, coding, production1.74/1.74/3.48 per 1M (75% promo: 0.435/0.435/0.87)
DeepSeek V4 FlashCost-optimized with near-Pro qualityHigh-volume, cost-sensitive workloads0.14/0.14/0.28 per 1M (cache hits: $0.0028). FREE unlimited on OpenCode
DeepSeek R1Dedicated chain-of-thought reasoning modelComplex math, hard coding, scientific reasoning1.74/1.74/3.48 per 1M (promo: 0.435/0.435/0.87)
Chat InterfaceFree web chat at chat.deepseek.comEveryoneFree, unlimited
API (OpenAI format)Drop-in replacement via api.deepseek.comDevelopers using OpenAI SDKsPer-token
API (Anthropic format)Drop-in replacement via api.deepseek.com/anthropicDevelopers using Anthropic SDKs and Claude CodePer-token
Agent IntegrationsUse DeepSeek as backend for 15+ coding agentsDevelopers using Claude Code, Copilot, etc.Per-token (via API key)
Open-Weight ModelsDownload V4 Flash and Pro for self-hostingPrivacy-sensitive, high-volume usersFree (MIT license)

Model Tiers — Quick Compare

ModelAPI Price (in/out)Cache HitContextBest For
DeepSeek V4 Pro0.435/0.435/0.87* (1.74/1.74/3.48 normally)$0.00361M tokensComplex reasoning, coding, thinking mode
DeepSeek V4 Flash0.14/0.14/0.28$0.00281M tokensHigh-volume, cost-sensitive, chat. FREE on OpenCode
DeepSeek R10.435/0.435/0.87* (1.74/1.74/3.48 normally)$0.00361M tokensComplex math, hard coding, scientific reasoning

*75% promotional pricing until May 31, 2026

Decision Tree: Which DeepSeek Product?

What do you want to do?
│
├─ Build AI apps → DeepSeek API (OpenAI or Anthropic format)
├─ Use Claude Code/GitHub Copilot → Agent Integration (replace backend model)
├─ Self-host for privacy/cost → Open-weight models (Ollama, HuggingFace)
├─ Chat for free → chat.deepseek.com
├─ Complex reasoning, coding → V4 Pro + Thinking Mode
├─ Complex math, hard coding → DeepSeek R1 (dedicated reasoning)
├─ High-volume, cost-sensitive → V4 Flash
├─ Compare costs vs Claude/GPT → See Comparison & Migration page
└─ Explore Chinese AI ecosystem → See /research/china-ecosystem/

Where to Go Next