OpenCode: your own model in the terminal

OpenCode is an open-source AI coding assistant that works right in your terminal. No subscriptions, no vendor lock-in. It supports autocomplete, code generation, refactoring, and explanations — all through an OpenAI-compatible API.

Unlike proprietary tools (GitHub Copilot, Cursor Pro), OpenCode is completely free and open. The only expense is the API provider for the LLM. With JoinGonka Gateway, that expense shrinks to $0.30 a month.

Setup takes a couple of minutes — either a one-command installer or manually with OpenCode's native tools, with no need to edit environment variables.

Step 1: Get API Key

Standard procedure for all tools:

Register at gate.joingonka.ai/register.
A 3M free token bonus is credited automatically.
Create an API key (format jg-xxx) in the Dashboard.

The same key works with Cursor, Cline, Continue.dev and any OpenAI-compatible client.

Step 2: Configure OpenCode

The easiest way is to set it up with a one-command installer. For CLI/file tools, it will automatically register the JoinGonka provider (baseUrl, models) and save the key to the native OpenCode storage without touching environment variables; for UI tools, it will display the values ready for input:

npx @joingonka/setup --tool opencode

The installer is universal (if no flag is provided, it will ask to select a tool from the list), it will ask for a jg-… key, and after configuration, it will perform a live check with a request to the gateway. It does not touch other settings. Below is the manual method if you prefer to set it up yourself.

Configure manually (Plan B)

OpenCode stores keys natively and describes providers in its own config — so manual setup also does not touch environment variables, and your other OpenAI-compatible tools will continue to work as before.

Step 1 — save the key. Run opencode auth login, select Other, enter the provider id joingonka and paste the jg-… key. OpenCode will save it to ~/.local/share/opencode/auth.json.

Step 2 — describe the provider. Add to ~/.config/opencode/opencode.json (the joingonka id must match step 1):

{
  "$schema": "https://opencode.ai/config.json",
  "provider": {
    "joingonka": {
      "npm": "@ai-sdk/openai-compatible",
      "name": "JoinGonka (Gonka)",
      "options": { "baseURL": "https://gate.joingonka.ai/v1" },
      "models": {
        "MiniMaxAI/MiniMax-M2.7": { "name": "MiniMax M2.7" },
        "deepseek-ai/DeepSeek-V4-Flash-0731": { "name": "DeepSeek V4 Flash" },
        "zai-org/GLM-5.3-Flash": { "name": "GLM-5.3 Flash" }
      }
    }
  }
}

You do not need to add the apiKey field to this file — OpenCode will use the key from auth.json via the matching id.

Model selection: by default, joingonka/MiniMaxAI/MiniMax-M2.7 is recommended; for reasoning tasks and the longest network context (390K) — joingonka/zai-org/GLM-5.3-Flash; large prompts without reasoning and the longest output — joingonka/deepseek-ai/DeepSeek-V4-Flash-0731 (380K, the second longest context).

Verification: run opencode and ask it to write a function. If the response arrives, the configuration is complete.

Why OpenCode + Gonka is the best combination

Three reasons why the OpenCode + Gonka combination is optimal for developers:

Fully open-source: both OpenCode and Gonka Network are open source. No vendor lock-in, no proprietary dependencies. You control every component.
Cost: $0.0069/1M tokens — thousands of times cheaper than any proprietary analog. GitHub Copilot costs $19-39/mo with limits. OpenCode + Gonka — no limits, for pennies.
Privacy: your code is not sent to Microsoft/OpenAI/Anthropic servers. Requests go through a decentralized network — there is no single storage for your data.

OpenCode supports many LLM providers, but with JoinGonka Gateway, you get an optimal balance of price, quality, and privacy. Alternative terminal tools: Claude Code, Aider.

Model parameters: context window — 200K tokens for MiniMax M2.7 (380K for DeepSeek V4 Flash, 390K for GLM-5.3 Flash), maximum response length — up to 8192 tokens (for DeepSeek V4 Flash — up to 32768). Current list of models: GET https://gate.joingonka.ai/v1/models.

OpenCode + Gonka = a fully open-source AI coding assistant for $0.30/month. No subscriptions, no vendor lock-in, no sending code to corporate servers. Free tokens upon sign-up.

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