OpenCode Review 2026: Open-Source CLI Agent by SST
🇺🇸Review of OpenCode, the open-source terminal coding agent from SST with BYOK, Go subscription, Zen pay-per-token, and Black flat-rate plans.
What Is OpenCode?
OpenCode is an open-source terminal-based AI coding agent built by SST, the team behind the serverless framework. It runs in your terminal, supports any model provider through BYOK, and offers multiple paid plans for managed model access.
What Sets It Apart
OpenCode occupies a specific niche in the CLI agent space: it is fully open source under the MIT license and genuinely free to use if you bring your own API keys. This sets it apart from Claude Code and Codex, which require paid subscriptions or specific provider accounts.
The vim-style interface feels natural for terminal-native developers. OpenCode handles multi-file editing, shell command execution, and test generation within a lightweight footprint. There is no IDE to install, no extension marketplace to navigate — just a terminal tool that works with your existing workflow.
Pricing Options
OpenCode has four tiers:
Free (Open Source) — Bring your own API keys from any provider. Full features, MIT-licensed, self-hostable. Free-tier models (MiniMax M2.5 Free, GPT 5 Nano, others) are available with rate limits.
Go ($10/mo) — Curated open-source coding models (GLM-5, Kimi K2.5, MiniMax M2.5, MiniMax M2.7) hosted globally across US, EU, and Singapore. The first month is $5. Usage is capped per 5-hour window, per week, and per month. You can combine Go with your own API keys from other providers. Go models can only be used within OpenCode itself, not in Cursor or other tools.
Zen (pay-as-you-go) — $20 credit top-ups with zero markup on model costs. Auto-reloads when your balance drops below $5. Works with any agent, not just OpenCode. Includes access to free models.
Black ($20/$100/$200 per month) — Flat-rate access to Claude, GPT, Gemini, and open-weight models through an enterprise API gateway. Enrollment is currently paused as of March 2026.
Trade-offs
The trade-off for this simplicity is a narrower feature set. OpenCode does not have IDE integration, browser automation, or the deep codebase indexing that tools like Cursor or Windsurf provide. It is a terminal tool, and it stays in the terminal.
Who It’s For
- Developers who want a free, open-source CLI agent with full control over model choice
- Terminal-native users who prefer lightweight tools over full IDE replacements
- Budget-conscious developers who want curated models for $10/mo via the Go plan
- Teams exploring flat-rate subscription pricing as an alternative to per-token API costs
- Developers who need an MIT-licensed tool they can inspect and modify
- Not ideal for those who want GUI-based editing or enterprise features like SSO and audit logs
Sources
Key Features
Supported Models
Multi-model (any) model family
OpenCode Pricing
Open Source
Free; download and self-host
- ✓ Full features
- ✓ Bring your own API key
- ✓ All supported models
Go
$5 first month, then $10/mo; curated open-source coding models
- ✓ Curated open-source models (GLM-5, Kimi K2.5, MiniMax M2.5, MiniMax M2.7)
- ✓ Global hosting (US, EU, Singapore)
- ✓ Usage-based limits per window/week/month
- ✓ Combine with BYOK providers
Zen
Pay-as-you-go; $20 credit top-ups; zero markup on model costs
- ✓ Pay per token with zero markup
- ✓ Auto-reload when balance drops below $5
- ✓ Works with any agent, not just OpenCode
- ✓ Free models available
Black
$20/$100/$200 per month tiers; enrollment currently paused
- ✓ Access to Claude, GPT, Gemini, and open-weight models
- ✓ Enterprise API gateway
- ✓ Flat-rate pricing
Plans, features, and usage limits may change. Always check OpenCode's official pricing for the latest details.
Confirmed Features
Platform Support
Platforms: Linux, Windows, macOS
IDEs: Terminal (editor-agnostic)
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