Free AI API Tools

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API AuthenticationAPI key management, Bearer tokens, env vars, security best practices. Code GeneratorReady-to-use call code in Python, JS, cURL, Go for live models. Context WindowsMax token limits compared across models, and how to stay inside them. Latency ComparisonMeasured response times per model; interactive latency calculator. Model Price ComparisonSide-by-side per-million-token pricing across all major models. Model PickerPick the right model for coding, chat, extraction or translation. Cost CalculatorEstimate your monthly spend against OpenAI, DeepSeek, Claude. Rate LimitingRPM / TPM / RPD limits and retry-with-backoff strategies. Streaming (SSE)Server-Sent Events streaming, chunk handling and edge cases. Structured OutputJSON mode, response_format and schema validation. Temperature & Top-pHow sampling parameters change creativity and determinism. Token CounterPaste text, get token counts per model. Runs entirely in browser. Tokenizer ComparisonSee how differently each model splits the same text.

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