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Best AI Tools with API Access

AI tools that offer a developer API so you can build on top of them, automate workflows, or integrate into your own products.

6 toolsUpdated September 2026
1
O

OpenAI API

Usage-based (from $0.60/1M tokens)

GPT-5.6, DALL-E 3, Whisper, and Embeddings via REST API

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2
A

Anthropic API

Usage-based (from $3/1M tokens)

Claude Sonnet 4.6 and Opus 4.6 with tool use and streaming

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3
E

ElevenLabs API

Usage-based (from $0.30/1K chars)

Text-to-speech and voice cloning via REST API

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4
S

Stability AI API

Usage-based (from $0.04/image)

Stable Diffusion image generation via REST API

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5
P

Perplexity API

Usage-based (from $1/1M tokens)

Web-grounded search and answer API with citations

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6
R

Runway API

Usage-based (credits)

Gen-3 video generation and editing via API

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#api-access#developer#b2b

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