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OpenAI is the AI research and deployment company behind GPT-4o, ChatGPT, and the API that powers countless UK AI products. Developers build on its models for text, vision, audio, and code generation, with fine-tuning and real-time APIs. Pricing is per-token, with generous free-tier credits for new developers. It integrates with every major framework and cloud. GDPR compliance is addressed via DPA and EU processing options, with enterprise controls. For UK startups shipping AI features, OpenAI's API is the default starting point.