clade-rate-limits

# Anthropic Rate Limits ## Overview Anthropic enforces three types of limits: requests per minute (RPM), input tokens per minute (TPM), and output tokens per minute. Limits depend on your spend tier. ## Rate Limit Tiers | Tier | Qualification | RPM | Input TPM | Output TPM | |------|--------------|-----|-----------|------------| | Tier 1 | Free | 50 | 40,000 | 8,000 | | Tier 2 | $40+ spend | 1,000 | 80,000 | 16,000 | | Tier 3 | $200+ spend | 2,000 | 160,000 | 32,000 | | Tier 4 | $400+ spend | 4,000 | 400,000 | 80,000 | | Scale | Custom | Custom | Custom | Custom | > **Check your tier:** console.anthropic.com → Settings → Limits ## Response Headers Every API response includes rate limit headers: ``` claude-ratelimit-requests-limit: 1000 claude-ratelimit-requests-remaining: 998 claude-ratelimit-requests-reset: 2025-01-01T00:01:00Z claude-ratelimit-tokens-limit: 80000 claude-ratelimit-tokens-remaining: 79500 claude-ratelimit-tokens-reset: 2025-01-01T00:01:00Z retry-after: 5 ``` ## Built-In SDK Retries The SDK automatically retries 429 and 529 errors with exponential backoff: ```typescript import Anthropic from '@claude-ai/sdk'; const client = new Anthropic({ maxRetries: 3, // default: 2. Set to 0 to disable. }); ``` ## Custom Backoff ```typescript async function callWithBackoff(params: Anthropic.MessageCreateParams, maxRetries = 5) { for (let attempt = 0; attempt < maxRetries; attempt++) { try { return await client.messages.create(params); } catch (err)...