Coding tools

A handoff. We generate the config for a coding tool, set the environment it needs, and start it. You spend no time figuring out where each tool keeps its provider config or which env var it reads for an API key.

melious launch

That runs your default tool. Name a tool to launch a specific one:

melious launch opencode

Supported tools

Tool	Command	How we wire it	Our pick
OpenCode	`opencode`	Generated JSON config	✓
Claude Code	`claude`	Anthropic-style env vars	—
Mistral Vibe	`vibe`	Generated TOML + `.env`	—

We default to OpenCode because it uses tokens efficiently and runs anywhere we do. Claude Code is great, but it spends tokens like it's writing an essay — see the note under its section before you pick it.

OpenCode

Open-source terminal coding agent, efficient, fast.

melious launch opencode does four things:

Generates an opencode.json with Melious registered as a provider
Populates the model list from our catalog, with real context lengths
Sets OPENCODE_CONFIG and MELIOUS_API_KEY
Starts opencode

Install:

curl -fsSL https://opencode.ai/install | bash

npm install -g opencode-ai

Requires Node.js and npm.

Or let us do it:

melious tools install opencode

Claude Code

Anthropic's agentic coding tool.

Claude Code uses noticeably more tokens than OpenCode or Vibe on the same task. That's real money through any provider, not a Melious thing. If cost matters to you, start with OpenCode and only reach for Claude Code when you've hit a wall.

melious launch claude-code does four things:

Sets Anthropic-compatible env vars:
- ANTHROPIC_BASE_URL → https://api.melious.ai
- ANTHROPIC_AUTH_TOKEN → your API key
- ANTHROPIC_MODEL → your main model
- ANTHROPIC_SMALL_FAST_MODEL → your lightweight model
- Tier mapping: opus → main, sonnet → secondary, haiku → lightweight
Disables telemetry (CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC=1)
Extends the request timeout to 50 minutes (API_TIMEOUT_MS=3000000)
Starts claude

Install:

curl -fsSL https://claude.ai/install.sh | bash

powershell -ExecutionPolicy ByPass -c "irm https://claude.ai/install.ps1 | iex"

Mistral Vibe

Mistral's open-source terminal coding agent. Python, multi-provider.

melious launch vibe does three things:

Generates config.toml with Melious as an OpenAI-compatible provider
Writes a .env with your API key
Sets VIBE_HOME to the generated config directory and starts vibe

Install:

curl -LsSf https://mistral.ai/vibe/install.sh | bash

uv tool install mistral-vibe

Requires uv.

Flags

Flag	Type	Default	Description
`--model`	string	from config	Override the main model
`--secondary`	string	from config	Override the secondary model
`--lightweight`	string	from config	Override the lightweight model
`--preset`	string	from config	Routing flavor. See Routing.
`--no-install`	bool	`false`	Don't offer to install a missing tool

Passing flags through

Anything after -- goes straight to the underlying tool:

melious launch opencode -- --debug

Per-tool model overrides

When you need a specific tool to use a different model from the global default:

melious tools model opencode deepseek-v3.2

The override lives in tool_models in your config and only applies when launching that tool. See Managing tools.

Changing the default tool

melious config set defaults.tool opencode

Coding tools

On this page