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Guides and concepts for the OpenAI API

Endpoints, parameters, and responses

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Latest: GPT-5.5
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How Perplexity Brought Voice Search to Millions Using the Realtime API
Designing delightful frontends with GPT-5.4
From prompts to products: One year of Responses
Using skills to accelerate OSS maintenance
Building frontend UIs with Codex and Figma

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API Reference
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Responses API
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Input Tokens

Get input token counts

$ openai responses:input-tokens count

POST/responses/input_tokens