OpenAI API

Free tier

The most widely used AI API — access GPT-4o, DALL·E, Whisper, and Embeddings from OpenAI.

Free tier available·Technical·Powered by OpenAI·API available

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Key strengths

GPT-4oAssistants APIRealtime APIfine-tuningwidest SDK coverage

Free tier + paid plans

San Francisco, US

Founded 2023

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OpenAI's platform provides APIs for: Chat Completions (GPT-4o, o1, o3), Embeddings (text-embedding-3-small/large), Image Generation (DALL·E 3), Speech (TTS + Whisper), and Assistants (stateful agents with file search + code interpreter). The Realtime API provides sub-300ms voice-to-voice. Fine-tuning available for GPT-4o mini and GPT-3.5. Batch API for 50% cost reduction on async workloads.

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