Agent Harnesses

FLARE supports three agent harnesses. All three implement the Harness interface.

Harness

Models

Billing

Credential

Claude Code

Anthropic Claude

Claude subscription

CLAUDE_CODE_OAUTH_TOKEN (OAuth)

Codex

OpenAI GPT

ChatGPT subscription

~/.codex (OAuth)

OpenCode

All Providers

Provider API

<PROVIDER>_API_KEY

Each harness page covers:

  1. Choosing a plan (or API account) — what to sign up for and where to track usage.

  2. Authentication — the one-time setup step that allows FLARE to invoke the agent.

  3. Using the harness — configuring the harness in Python for use by FLARE.

  4. Cost tracking — how to track the cost of agent usage.