DeepSeek CLI & API Deep Dive — Install, Reach, Use-Cases & Cost (CPI) 2026

By Shakti Tiwari — AI practitioner, systems builder

Guide. Not financial advice. Free help at optiontradingwithai.in.

1. What Is DeepSeek

DeepSeek (China) builds open-weight reasoning models (V3, R1). No official "CLI" — you use it via Ollama (local) or API (deepseek.com).

2. Install

# Local:
ollama pull deepseek-r1:7b
ollama run deepseek-r1:7b
# API:
export DEEPSEEK_API_KEY=sk-...
curl https://api.deepseek.com/v1/chat/completions \
  -d '{"model":"deepseek-reasoner","messages":[...]}'

3. Who Reaches It

• Cost-sensitive devs
• Researchers (open weights)
• Privacy users (local)
• Math/code heavy tasks

Reach: huge open-source adoption.

4. Real Use-Cases

1. Reasoning — math proofs
2. Code — complex algorithms
3. Local — no cloud, private
4. Fine-tune — open weights
5. RAG — cheap embedding
6. Translate — multilingual
7. Analyze — logic puzzles
8. Teach — step-by-step

5. CPI / Pricing (2026 public)

Model	Input /1K	Output /1K
DeepSeek-V3	$0.00027	$0.0011
DeepSeek-R1	$0.00055	$0.0022
Local (Ollama)	$0	$0

CPI: R1 5K-token reasoning + 2K out ≈ $0.007. Local = free.

6. vs Others

• OpenAI: 10x cost
• Claude: code quality
• Gemini: context
• DeepSeek: price + open

7. Local Integration

Hermes + DeepSeek (Ollama) = $0 private reasoning.

8. Cost Control

• Local first
• API only for hard tasks
• Cache

9. Risks

• Geo access
• Less multimodal

10. My Stack

Hermes + DeepSeek local (default) + Claude (hard code).

FAQ

Q: Free?
A: Local = $0.

Q: Safe?
A: Local = no key.

Q: Advice?
A: Education.

About

Shakti Tiwari. Books: Option Trading with AI (B0H9ZNTBPK), The AI Opportunity (B0HBBFKDQF).

🌐 optiontradingwithai.in
📧 [e-mail]

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Disclaimer: Not financial advice.