Claude API tools

Free calculators and references for planning Claude API work — no signup required.

Claude API cost calculatorPrice a workload at official Anthropic rates and at ours, with batch and caching discounts.Which Claude model should you use?Opus vs Sonnet vs Haiku, matched to real use cases.Claude API rate limitsRPM, TPM, concurrency, and how to handle 429s properly.

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ClaudeAPIKey.dev is an independent API gateway and is not affiliated with, endorsed by, or sponsored by Anthropic. “Claude” and “Anthropic” are trademarks of Anthropic. Official Anthropic list prices shown for comparison are taken from Anthropic’s published pricing and may change; our rates are read from our own live catalogue. Estimates are calculated from the token counts you enter and will differ from real usage.