OpenCode

Open source agent supporting 75+ LLM providers with privacy-focused architecture

Overview

OpenCode is an open source coding agent that supports 75+ LLM providers. In Blocks, OpenCode runs Anthropic, OpenAI, Moonshot AI and Google models, using either your own provider keys, an OpenCode Zen or OpenCode Go key, or Blocks LLM credits. With over 650,000 monthly users, OpenCode offers a privacy-focused approach where no code is stored on external servers.

OpenCode is currently experimental and may have different behavior or limitations compared to stable agents like Claude Code or Codex.

Latest Models

In Blocks, OpenCode can run the following models:

• Anthropic: Claude Opus 5, Claude Sonnet 5, Claude Fable 5.1, Claude Opus 4.8, Claude Sonnet 4.6, Claude Haiku 4.5
• OpenAI: GPT-5.6 Luna, GPT-5.6 Terra, GPT-5.6 Sol, GPT-5.5, GPT-5.4
• Moonshot AI: Kimi K2.5, Kimi K2.6, Kimi K2.7 Code, Kimi K3
• Google: Gemini 3.1 Pro Preview, Gemini 3.7 Flash, Gemini 2.5 Pro

Which of these you can select depends on the authentication method. A provider API key covers that provider’s models, OpenCode Zen covers everything except Gemini 2.5 Pro, OpenCode Go covers five models, and Blocks covers the full list.

Authentication

OpenCode supports several authentication methods. Pick one under Settings → Agents → OpenCode → Authentication Method:

Anthropic API Key

Use Anthropic models (Claude Opus 5, Sonnet 5)

1. Get an API key at Anthropic Console
2. Set the environment variable: ANTHROPIC_API_KEY=sk-ant-...
3. In Blocks Dashboard, go to Dashboard → Agents
4. Select OpenCode and choose “Anthropic”
5. Paste your API key

OpenAI API Key

Use OpenAI models (GPT-5.6, GPT-5.5)

1. Get an API key at OpenAI Platform
2. Set the environment variable: OPENAI_API_KEY=sk-...
3. In Blocks Dashboard, go to Dashboard → Agents
4. Select OpenCode and choose “OpenAI”
5. Paste your API key

Kimi API Key

Use Moonshot AI’s Kimi models

1. Get an API key at Moonshot AI Platform
2. Set the environment variable: KIMI_API_KEY=...
3. In Blocks Dashboard, go to Dashboard → Agents
4. Select OpenCode and choose “Kimi”
5. Paste your API key

OpenCode Zen

Use one OpenCode Zen key for the whole roster

1. Get a key at OpenCode Zen
2. Set the environment variable: OPENCODE_API_KEY=...
3. In Blocks Dashboard, go to Settings → Agents → OpenCode
4. Set Authentication Method to “OpenCode Zen”

One key covers every model in the list above except Gemini 2.5 Pro, which Zen does not serve. Usage draws on your prepaid Zen balance.

OpenCode Go

The cheaper OpenCode tier, on a smaller roster

1. Set the same OPENCODE_API_KEY environment variable
2. In Blocks Dashboard, go to Settings → Agents → OpenCode
3. Set Authentication Method to “OpenCode Go”
4. Select a model Go serves: Kimi K2.5, Kimi K2.6, Kimi K2.7 Code, Kimi K3, or GPT-5.6 Luna

OpenCode Go serves no Anthropic models, so switch your model when you select Go. Go also bills a separate subscription wallet from Zen, with per-model quotas, which is why it is its own authentication method rather than a variation of Zen.

Blocks

Run on Blocks LLM credits

1. In Blocks Dashboard, go to Settings → Agents → OpenCode
2. Set Authentication Method to “Blocks”

There is no API key to set. Requests route through the Blocks AI Gateway and usage draws on your Blocks LLM credits. Every model listed above is available.

Setting as Default

To use OpenCode automatically for all requests:

1. Go to Dashboard → Agents
2. Select “Set as default agent” from OpenCode’s dropdown menu

Using OpenCode

Once configured, OpenCode is used automatically if it’s your default agent:

@blocks can you review this code?

Or use the /opencode slash command to use it specifically:

@blocks /opencode implement this feature using GPT-5.6 Terra

Best For

• Flexibility between OpenAI, Anthropic, Kimi and Gemini models
• Privacy-focused development (no code storage)
• Open source transparency
• Cost optimization (switch between providers based on task complexity)
• Experimentation with different models from major providers
• Teams wanting to avoid vendor lock-in

Anthropic, OpenAI, Moonshot AI and Google models are all available in Blocks, so you can move between them as a task demands.

Cost

OpenCode costs depend on the authentication method:

• Provider API key: Billed directly by that provider. Check Anthropic Pricing, OpenAI Pricing or the Moonshot AI Platform
• OpenCode Zen: Drawn from your prepaid Zen balance
• OpenCode Go: Drawn from your Go subscription wallet, with per-model quotas
• Blocks: Billed against your Blocks LLM credits

OpenCode Zen and OpenCode Go usage is billed by OpenCode against your own key. It does not go through the Blocks AI Gateway and is not billed by Blocks.

Next Steps

Claude Code

Learn about Claude Code

Codex Agent

Explore Codex capabilities