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Instant, natural-sounding AI text-to-speech API and no-registration playground. GPT Realtime 2 is an AI-powered platform designed for instant, natural-sounding audio generation and text-to-speech (TTS) services. It provides a no-registration playground where users can transform text into speech using various AI voices like Alloy, Echo, and Shimmer. For developers, it offers a production-ready API route via OpenRouter, specifically utilizing the openai/gpt-audio model. The system supports streaming audio responses, transcript feedback, and multiple output formats, making it a comprehensive tool for building voice-enabled applications and workflows.