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Anthropic Claude

Anthropic's Claude models excel at complex reasoning and nuanced conversation.

Setup​

1. Get API Key​

  1. Go to Anthropic Console
  2. Sign in or create an account
  3. Navigate to API Keys
  4. Create a new key

2. Configure Environment​

LLM_PROVIDER=anthropic
ANTHROPIC_API_KEY=sk-ant-...your-api-key
ANTHROPIC_MODEL=claude-sonnet-4-20250514
ANTHROPIC_MAX_TOKENS=4096
Required Parameter

Anthropic requires ANTHROPIC_MAX_TOKENS to be set. This limits response length.

Available Models​

ModelContextBest ForCost (Input)
claude-opus-4200KMost capable$15.00/1M
claude-sonnet-4200KBalanced$3.00/1M
claude-3-5-haiku200KFast & cheap$0.80/1M

Configuration Options​

# Required
ANTHROPIC_API_KEY=sk-ant-...
ANTHROPIC_MAX_TOKENS=4096

# Model selection
ANTHROPIC_MODEL=claude-sonnet-4-20250514

Cost Estimation​

For a typical 3-minute session with Claude Sonnet:

ComponentTokensCost
System + context~2500$0.0075
User messages~200$0.0006
Responses~1200$0.018
Total~3900~$0.03

Troubleshooting​

"max_tokens is required"​

  • Ensure ANTHROPIC_MAX_TOKENS is set in .env
  • Typical value: 4096 or 8192

"Invalid API key"​