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TTS & STT Landscape in Springโ€“Summer 2026: On-Device Breakthroughs, API Consolidation, and Open-Source Acceleration

A comprehensive overview of text-to-speech and speech-to-text developments from April to July 2026, covering on-device breakthroughs (Supertonic, Kokoro), cloud API evolution (xAI Grok, OpenAI Realtime, Gemini 3.1 Flash), the TTS Arena leaderboard with 74 ranked models, MOSS-TTS open-source family, browser-based STT, and voice cloning comparisons.

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