English | Русский | O'zbekcha

A high-performance Golang CLI utility and local API proxy server that enables any application or coding agent to connect to DeepSeek V3 (deepseek-chat) and R1 (deepseek-reasoner / Thinking) models via a free web account (chat.deepseek.com), without requiring an official paid DeepSeek API key.

Rewritten from scratch in pure Go (Golang) based on in-depth analysis of Node.js (FreeDeepseekAPI-EN) and Python (deepseek_bridge) projects, featuring zero runtime dependencies.

1. Pure Go Parallel PoW (Proof-of-Work) Solver:
   • Solves DeepSeek server challenges using the DeepSeekHashV1 algorithm (Keccak-f[1600] 1..23 rounds SHA3-256) parallelized across CPU cores.
   • Solves difficulty 144,000 challenges in just ~40–50 milliseconds (no CGO, WASM, or Python dependencies required).
2. Interactive Terminal Chat (REPL):
   • Streams the R1 model's thought process (reasoning_content) in real-time with dedicated styling (italic/cyan).
   • Polished ANSI UI with colorful prompts and animated loading spinners.
   • Built-in slash commands: /help, /new, /model, /thinking, /search, /whoami, /clear, /exit.
3. One-Off & Unix Pipe Support:
   • Direct CLI queries: nexus "What is quantum computing?"
   • Linux/macOS pipe workflows: cat main.go | nexus "Review this code for security and performance"
4. OpenAI, Anthropic & Ollama Compatible Proxy Server (nexus serve):
   • POST /v1/chat/completions (OpenAI format, SSE streaming, and JSON)
   • POST /v1/messages (Anthropic Messages API — 100% compatible with Claude Code and the Anthropic SDK!)
   • POST /v1/responses (OpenAI Responses API)
   • GET /v1/models and GET /v1/model-capabilities
   • GET /v1/sessions and POST /v1/sessions/reset
   • Connects seamlessly with Open WebUI, Continue.dev, Cursor, Cline, and any other OpenAI/Anthropic client.
5. Native Ollama API Emulation 🦙:
   • Emulates GET /api/tags, POST /api/chat, POST /api/generate, GET /api/version.
   • Direct plug-and-play compatibility with Open WebUI, Dify, AnythingLLM, Cursor, LlamaIndex, and official Ollama SDKs.
6. Structured Outputs & JSON Schema 🎯:
   • Enforce strict JSON output or validate against JSON Schemas across CLI, Ollama, and OpenAI endpoints.
7. Universal Integrations (Launcher) 🚀:
   • One-command launcher for Claude Code, DeepSeek Harness, Codex, OpenCode, Goose, and Aider (Nexus automatically boots the proxy in the background).
8. Multi-Account Pool 👥:
   • Rotate multiple DeepSeek accounts using Round-Robin scheduling to eliminate rate-limit roadblocks (HTTP 429).
9. Authentication Management (nexus auth):
   • Manual login: nexus auth login (extract userToken from browser LocalStorage)
   • Automatic via Chrome: nexus auth chrome (reads session token from browser memory via CDP)
   • Account inspection: nexus auth whoami
10. System Diagnostics (Doctor):
    • nexus doctor — instantly checks token validity, server connectivity, PoW solver performance, and session creation.

Requires Go 1.20+:

# Clone repository and navigate to directory:
git clone https://github.com/xamrayev/nexus-cli.git
cd nexus-cli

# Build the executable binary:
go build -o bin/nexus .

# Install globally to system PATH (optional):
go install .

There are 3 ways to connect your DeepSeek account:

You will be prompted for your userToken:

1. Open https://chat.deepseek.com in your browser.
2. Press F12 (or Cmd+Option+I on macOS).
3. Navigate to Application -> Local Storage -> https://chat.deepseek.com -> copy the userToken value and paste it into the prompt.

This automatically launches a Chrome window. Once you log in, Nexus securely captures and stores the session token.

Create a .env file in the project root:

DEEPSEEK_TOKEN=your_deepseek_token_here

Or simply:

Real-time R1 reasoning stream:

nexus ❯ Why is the sky blue?

💭 Thinking Process:
The user is asking about the physical cause behind the color of the sky...
Need to explain the mechanism of Rayleigh scattering of sunlight by atmospheric molecules...

🤖 DeepSeek (deepseek-reasoner):
The primary reason the sky appears blue is due to a phenomenon called Rayleigh scattering...

./bin/nexus "Provide 3 key facts about general relativity"

cat main.go | ./bin/nexus "Analyze this code for security vulnerabilities and performance bottlenecks"

./bin/nexus serve --port 9655

You can now route any tool (Cursor, Open WebUI, Claude Code) to http://localhost:9655/v1!

Sample cURL request in OpenAI format:

curl http://localhost:9655/v1/chat/completions \
  -H "Content-Type: application/json" \
  -d '{
    "model": "deepseek-reasoner",
    "messages": [{"role": "user", "content": "Hello!"}],
    "stream": true
  }'

Nexus implements the Ollama API specification. Open WebUI, Dify, AnythingLLM, Cursor, LlamaIndex, and official Ollama libraries can connect directly to http://localhost:9655:

# 1. Fetch available models (Ollama format)
curl http://localhost:9655/api/tags

# 2. Ollama Chat request (NDJSON streaming)
curl http://localhost:9655/api/chat -d '{
  "model": "deepseek-reasoner",
  "messages": [{"role": "user", "content": "Hello!"}],
  "stream": true
}'

Using the official Python Ollama SDK:

import ollama

client = ollama.Client(host="http://localhost:9655")
resp = client.chat(model="deepseek-reasoner", messages=[
    {"role": "user", "content": "Write a simple HTTP server in Go"}
])
print(resp["message"]["content"])

Enforce strict JSON output or conform to a specified schema:

# 1. Direct JSON from CLI (pipeable to jq)
./bin/nexus "Top 3 programming languages and their primary domains" --format json | jq .

# 2. Via Ollama API:
curl http://localhost:9655/api/chat -d '{
  "model": "deepseek-reasoner",
  "messages": [{"role": "user", "content": "List 3 fruits in JSON"}],
  "format": "json",
  "stream": false
}'

# 3. Via OpenAI API (response_format):
curl http://localhost:9655/v1/chat/completions -d '{
  "model": "deepseek-reasoner",
  "messages": [{"role": "user", "content": "Return device specs as JSON"}],
  "response_format": {"type": "json_object"}
}'

Launch coding tools and agents with a single command — Nexus automatically boots the proxy server in the background:

# 1. Claude Code CLI (powered by DeepSeek R1 / V3)
./bin/nexus launch claude
./bin/nexus launch claude -p "Refactor this Go code"

# 2. Official DeepSeek Harness CLI (@deepseek-ai/dsh)
./bin/nexus launch dsh

# 3. OpenAI Codex CLI (auto-configured with responses wire API)
./bin/nexus launch codex

# 4. OpenCode CLI (with automated config injection)
./bin/nexus launch opencode

# 5. Block Goose AI Agent (via OpenAI provider)
./bin/nexus launch goose

# 6. Aider Pair Programming CLI (with DeepSeek R1)
./bin/nexus launch aider

# 7. ChatGPT Desktop (macOS) & local bridge
./bin/nexus launch chatgpt

# 8. Multi-Account Pool Monitor
./bin/nexus launch pool

# 9. DeepSeek Agentic Eval & Benchmark Harness
./bin/nexus launch harness

Avoid rate limits (HTTP 429) by cycling through multiple DeepSeek accounts using Round-Robin rotation:

# Add a new account
./bin/nexus auth add acc2 --chrome

# List accounts and check their status
./bin/nexus auth list

# Switch active account
./bin/nexus auth switch acc2

# Validate all accounts in the pool
./bin/nexus auth test

nexus-cli/
├── bin/
│   └── nexus                     # Compiled binary executable
├── cmd/
│   └── nexus/main.go             # CLI command dispatcher
├── pkg/
│   ├── deepseek/
│   │   ├── pow.go                # Pure Go parallel DeepSeekHashV1 Keccak PoW solver
│   │   ├── pow_test.go           # PoW test suite & benchmarks
│   │   ├── stream.go             # SSE JSON patch & OpenAI stream parser
│   │   ├── stream_test.go        # Stream tests
│   │   ├── auth.go               # Token, session, and profile manager
│   │   ├── chrome_auth.go        # Automated Chrome CDP authentication
│   │   ├── client.go             # DeepSeek Web API client (Chat, Sessions, Auto-retry)
│   │   └── types.go              # Model configs and type definitions
│   ├── server/
│   │   ├── server.go             # Local HTTP proxy server (Routing, CORS, Auth)
│   │   ├── server_test.go        # Server endpoint unit tests
│   │   ├── openai.go             # OpenAI Chat Completions API adapter
│   │   ├── anthropic.go          # Anthropic Messages API adapter (for Claude Code)
│   │   └── session.go            # Agent session isolation and cleanup
│   ├── launcher/
│   │   └── launcher.go           # Launchers for Claude Code, Codex, Goose, Aider, etc.
│   └── cli/
│       ├── terminal.go           # ANSI styling, banners, and spinners
│       ├── repl.go               # Interactive terminal chat & slash commands
│       ├── runner.go             # Single-prompt and Unix pipe runner
│       └── doctor.go             # End-to-end system diagnostics
├── main.go                       # Application entry point
├── go.mod                        # Go module definition
├── README.md                     # Main documentation (English)
├── README.ru.md                  # Russian documentation (Русский)
└── README.uz.md                  # Uzbek documentation (O'zbekcha)

Distributed under the MIT License.