Voice AI Weekly: Watermarking Rules, Emotion Prompts, and Open-Source Agent Tools

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A developer blog on DEV Community recapped six posts covering major voice AI developments from the past week. The EU AI Act's synthetic audio watermarking rules took effect on August 2, requiring TTS API providers to implement marking pipelines for generated audio. Kakao released Kanana-o, a text-to-speech model scoring 94.50 on the Korean InstructTTSEval that handles emotion through natural language instructions rather than SSML tags. Nous Research shipped Hermes Agent v0.20.0, an open-source voice agent framework with streaming TTS, barge-in support, and pluggable backends, positioning it as a competitor to proprietary options. The roundup also highlighted a one-year leap in AI coding benchmarks, with top models jumping from 49% to 95% on SWE-bench, and a demonstration of Claude Fable 5 generating a fully playable 3D browser game from a single prompt.

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