Claude

Use your Claude Max/Pro subscription in opencode — no API key needed.

Why this exists? Read our Open Letter to Anthropic about token efficiency, developer freedom, and collaboration.

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Three Ways to Use

Approach	Best for	Install
Plugin	opencode users — native provider, no proxy	opencode plugin @life-ai-tools/opencode-claude
Proxy	Cursor, other OpenAI-compatible clients	bunx @life-ai-tools/opencode-proxy
SDK	Building your own tools	npm i @life-ai-tools/claude-code-sdk

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🔌 Plugin (Recommended)

Native Vercel AI SDK v3 provider — installs directly into opencode. No proxy, no translation layer. Each opencode instance gets its own isolated provider backed by our claude-code-sdk for OAuth, streaming, retry logic, and thinking support.

Setup

# 1. Install the plugin
opencode plugin @life-ai-tools/opencode-claude

# 2. Login (opens browser)
opencode providers login -p claude-max

# 3. Done — Claude models appear in opencode's model list
opencode

Select Claude Opus 4.6 (Max), Sonnet 4.6 (Max), or Haiku 4.5 (Max) from the model picker.

Features

• Native AI SDK provider — implements LanguageModelV3 directly, no @ai-sdk/anthropic dependency
• Reasoning effort selector — low/medium/high for Opus and Sonnet 4.6 (controls thinking budget)
• Streaming with full lifecycle — text, thinking/reasoning, tool calls with incremental arguments
• Image/PDF support — paste images (Ctrl+V), attach files (Ctrl+U); auto-resize to Anthropic's native 1568px
• Prompt caching — 1-marker strategy matching Claude Code, with cross-project cache sharing
• Cache keepalive — keeps cache warm indefinitely while session is open (zero quota cost)
• TUI sidebar — real-time cache hit ratio and estimated savings visible in sidebar (Ctrl+X B)
• /cache command — diagnostics dialog with keepalive stats, API jitter, active sessions
• Auto token refresh — credentials managed by claude-code-sdk with triple-check pattern
• Per-project isolation — each opencode instance runs its own provider, no shared state
• Compaction hook — injects cache context into compaction summaries for better continuity

Configuration

Configure via opencode.json provider options:

{
  "$schema": "https://opencode.ai/config.json",
  "provider": {
    "claude-max": {
      "options": {
        "keepalive": true,
        "keepaliveInterval": 120,
        "keepaliveIdle": 0,
        "debug": false
      }
    }
  }
}

Option	Type	Default	Description
keepalive	boolean	true	Enable/disable cache keepalive
keepaliveInterval	number	120	Keepalive fire interval in seconds
keepaliveIdle	number	0 (∞)	Stop keepalive after N seconds idle (0 = never)
debug	boolean	true	Enable debug logging to ~/.claude/claude-max-debug.log
customCompaction	string	—	Replace default compaction prompt entirely (see Compaction)

Live-reload config — edit ~/.claude/keepalive.json to tune keepalive at runtime without restarting:

{
  "enabled": true,
  "intervalSec": 120,
  "idleTimeoutSec": null,
  "minTokens": 2000
}

Cache & Keepalive

The plugin automatically caches prompt prefixes (system prompt + tools ≈ 30K tokens) and keeps them warm via periodic 1-token API calls. This means:

• First call of the day: ~30K tokens written to cache (one-time cost)
• Every subsequent call: reads from cache (99%+ hit ratio typical)
• Cross-project: all projects share the same tool prefix cache (CWD paths normalized)
• Cross-session: restarting a session reuses cache from any alive session
• Keepalive cost: ~183 output tokens/day (0.04% of real traffic), zero quota impact

View cache stats in the sidebar (Ctrl+X B) or type /cache for detailed diagnostics.

Compaction

When opencode compacts a long conversation into a summary, our plugin injects cache optimization context:

## Cache Optimization Notes
- This session uses Anthropic prompt caching with keepalive
- Cache prefix (system + tools ≈30K tokens) is shared across all sessions
- When continuing, reuse exact tool names and file paths to maximize cache hits
- Cache read is 10x cheaper than uncached input

This helps the next turn after compaction maintain good cache behavior.

Full custom compaction prompt:

You can completely replace opencode's default compaction prompt:

{
  "provider": {
    "claude-max": {
      "options": {
        "customCompaction": "Summarize this conversation focusing on: 1) Current task and progress 2) File paths being worked on 3) Key decisions made. Format as structured handover for the next agent."
      }
    }
  }
}

Compaction model override:

Use a cheaper/faster model for compaction summaries:

{
  "agents": {
    "compaction": {
      "model": "claude-max/claude-haiku-4-5-20251001",
      "temperature": 0.3
    }
  }
}

Disable auto-compaction (manage context manually):

{
  "compaction": {
    "auto": false,
    "prune": false
  }
}

Image Support

Paste images with Ctrl+V or attach files with Ctrl+U. The plugin:

• Auto-resizes to 1568px (Anthropic's native vision resolution) — zero quality loss
• Preserves PNG format for screenshots (sharp text), falls back to JPEG only if PNG exceeds 3.75MB
• Rejects images >5MB with user-friendly message
• Supports JPEG, PNG, GIF, WebP

Per-Project Credentials

During login, choose where to save credentials:

• "This project" → saves to ./.claude/.credentials.json — isolated to this project
• "Global" → saves to ~/.claude/.credentials.json — shared across projects

Supported Models

Model	Name in opencode	Reasoning	Context	Best for
claude-opus-4-6	Claude Opus 4.6 (Max)	✅ low/med/high	1M	Complex reasoning, architecture
claude-sonnet-4-6	Claude Sonnet 4.6 (Max)	✅ low/med/high	1M	Fast coding, daily driver
claude-haiku-4-5-20251001	Claude Haiku 4.5 (Max)	—	200K	Quick tasks, title generation

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🔀 Proxy

For Cursor, Continue, or any OpenAI-compatible client. Runs a local server that translates between OpenAI format and Claude's API.

Quick Start

# Install Bun
curl -fsSL https://bun.sh/install | bash

# Start proxy
bunx @life-ai-tools/opencode-proxy

# In opencode:
LOCAL_ENDPOINT=http://localhost:4040/v1 opencode

Proxy Features

• Daemon mode — proxy survives opencode exit, shared by multiple instances
• Zero-downtime reload — POST /admin/reload drains active streams
• Multi-account — per-request credential routing via X-Account header
• Token usage logging — in/out/cache stats on every request
• Verbose mode — --verbose dumps raw SSE events

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📦 SDK

For building your own tools on top of Claude Max/Pro.

npm install @life-ai-tools/claude-code-sdk

import { ClaudeCodeSDK } from '@life-ai-tools/claude-code-sdk'

const sdk = new ClaudeCodeSDK()

// Streaming
for await (const event of sdk.stream({
  model: 'claude-sonnet-4-6-20250415',
  messages: [{ role: 'user', content: 'Write a haiku about coding' }],
  maxTokens: 1024,
})) {
  if (event.type === 'text_delta') process.stdout.write(event.text)
  if (event.type === 'thinking_delta') process.stdout.write(event.text)
}

// Non-streaming
const response = await sdk.generate({
  model: 'claude-opus-4-6-20250415',
  messages: [{ role: 'user', content: 'What is 2+2?' }],
  maxTokens: 256,
  thinking: { type: 'enabled', budgetTokens: 5000 },
})

SDK Features

• Zero API key — uses Claude Max/Pro OAuth credentials
• Streaming — SSE with text, thinking (with signature), and tool use events
• Auto-refresh — token triple-check refresh pattern
• Retry logic — exponential backoff for 5xx errors, never retry 429
• Tool use — full function calling support
• Thinking — extended thinking with signature capture for multi-turn
• Prompt caching — automatic cache markers with keepalive
• Image support — auto-resize to 1568px native resolution
• Live config — ~/.claude/keepalive.json for runtime tuning

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Troubleshooting

"Not logged in"

opencode providers login -p claude-max

"Rate limited" / 429

Subscription usage limit reached. Wait for reset window (usually daily). Rate limits are never retried by design.

"Token expired" / 401

Tokens auto-refresh. If persistent, re-login:

opencode providers login -p claude-max

Slow cold start

If first response takes 30+ seconds, check MCP servers — disable unused ones:

opencode mcp disable <server-name>

Debug logging

# Via config (opencode.json)
{ "provider": { "claude-max": { "options": { "debug": true } } } }

# Via env var
CLAUDE_MAX_DEBUG=1 opencode

# View logs
tail -f ~/.claude/claude-max-debug.log

Cache not working

Check sidebar (Ctrl+X B) — should show "Cache" section with hit ratio. If missing:

1. Restart opencode to load TUI plugin
2. Verify ~/.config/opencode/tui.json has the plugin listed
3. Type /cache for detailed diagnostics

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Project Structure

opencode-claude-toolkit/
├── packages/
│   ├── opencode-claude/          # Plugin + native AI SDK provider
│   │   ├── index.ts              # Plugin server: config, OAuth, compaction hook
│   │   ├── provider.ts           # LanguageModelV3: createClaudeMax()
│   │   └── tui.tsx               # TUI plugin: sidebar cache stats + /cache command
│   └── opencode-proxy/           # OpenAI-compatible proxy server
│       ├── server.ts             # HTTP server with daemon mode
│       └── translate.ts          # OpenAI ↔ Claude format translation
├── dist/                         # Compiled SDK (published to npm)
├── examples/                     # Usage examples
├── CHANGELOG.md                  # Version history
├── OPEN-LETTER.md
└── README.md

npm Packages

Package	Description
@life-ai-tools/claude-code-sdk	TypeScript SDK (compiled bundle)

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License

MIT — see LICENSE

Source Access

The SDK is distributed as a compiled bundle. For source access requests, see REQUEST-SOURCE.md.

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