Anthropic

Use Claude models - Opus, Sonnet, and Haiku - via the Anthropic API. Best-in-class tool calling, coding, and reasoning.

Anthropic’s Claude models are the default recommended provider in profClaw. They offer native tool calling, vision support, and large context windows up to 1M tokens.

Supported Models

Model	ID	Context	Max Output	Tools	Vision	Input $/1M	Output $/1M
Claude Opus 4.6	claude-opus-4-6	1M	128K	Yes	Yes	$5.00	$25.00
Claude Sonnet 4.5	claude-sonnet-4-5-20250929	200K	16K	Yes	Yes	$3.00	$15.00
Claude Haiku 4.5	claude-haiku-4-5-20251001	200K	8K	Yes	Yes	$0.25	$1.25

Setup

1. Get an API key

   Sign up at console.anthropic.com and create an API key.

2. Set the environment variable

   export ANTHROPIC_API_KEY=sk-ant-api03-...
   

   Or add it to your .env file.

3. Verify configuration

   profclaw doctor --provider anthropic
   

Environment Variables

ANTHROPIC_API_KEY · string · required

Your Anthropic API key. Format: sk-ant-api03-...

ANTHROPIC_BASE_URL · string

Override the API base URL. Useful for proxies or custom endpoints. Defaults to https://api.anthropic.com.

Configuration Example

.env

ANTHROPIC_API_KEY=sk-ant-api03-...

settings.yml

providers:
  default: anthropic
  anthropic:
    api_key: "${ANTHROPIC_API_KEY}"
    # Optional: custom endpoint
    # base_url: "https://your-proxy.example.com"

CLI

profclaw config provider add anthropic --key sk-ant-api03-...
profclaw config provider set-default anthropic

Model Aliases

Alias	Model
opus	claude-opus-4-6
sonnet	claude-sonnet-4-5-20250929
haiku	claude-haiku-4-5-20251001

Usage Examples

CLI

# Use default model (auto-selected)
profclaw chat "Explain async/await in JavaScript"

# Use a specific alias
profclaw chat --model opus "Review this architecture"

# Use full model ID
profclaw chat --model claude-haiku-4-5-20251001 "Quick question"

Notes

• Anthropic is the top-priority provider in profClaw’s auto-selection order.
• All Claude models support native function calling - tools work reliably without fallback prompting.
• Opus has a 1M token context window, suitable for large codebases.
• Claude Haiku 4.5 is the recommended model for high-throughput, cost-sensitive workloads.

Related

• AI Providers Overview - Compare all 37 supported providers
• OpenAI - GPT-4o and o-series reasoning models
• profclaw provider - Add and test providers from the CLI
• profclaw models - List and manage model aliases