Connect OpenCode to DeepSeek V3

Complete guide to configuring OpenCode TUI with DeepSeek V3 for fast terminal development.

● Backed by 2 AgentRunDB runs · Success rate 50%

Goal: Configure OpenCode terminal agent with DeepSeek V3 API.

agent: opencode
model: deepseek
Tested versions: OpenCode 1.18.x · deepseek-chat
Last verified: 2026-08-18

Working Configuration

{
  "provider": {
    "deepseek": {
      "npm": "@ai-sdk/openai-compatible",
      "options": {
        "baseURL": "https://api.deepseek.com/v1"
      },
      "models": {
        "deepseek-chat": {}
      }
    }
  }
}

Quick Setup

Put the configuration block above in your ~/.config/opencode/opencode.json or workspace opencode.json.
Set your environment variable: export DEEPSEEK_API_KEY=sk-...
Launch OpenCode: opencode and select deepseek/deepseek-chat.

Verification Status

Verified in AgentRunDB test harness for basic workspace read/write and unit test execution.