Hi, I’m running into issues using FallbackAdapter for STT returning false for aligned_transcript even if the underlying models support aligned transcript. The models I had wrapped in the FallbackAdapter were: Deepgram’s nova-3 AssemblyAI’s default model Is there something I’m doing wrong here? O…

FallbackAdapter does not override or strip STT capabilities. It wraps multiple STT instances and forwards their capabilities, including aligned_transcript, based on the active provider. If aligned_transcript is returning False, it means the adapter’s effective capabilities (as reported by the wrappe…

This is actually an issue with FallbackAdapter. I ran into the same thing and confirmed it with LiveKit support. They’ve already fixed it on their end, but I don’t think the fix has been released yet. For now, you can use a temporary workaround by manually overriding the capability: stt_adapter = …

FallbackAdapter with aligned_transcript

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darryncampbell (Darryn) April 10, 2026, 8:32am 4

Thanks @Tejas_Jadhav ,

Looks like that fix was included in Fix/stt fallback adapter propagate aligned transcript by miladmnasr · Pull Request #5237 · livekit/agents · GitHub which was part of the Agents 1.5.2 release:

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FallbackAdapter with aligned_transcript

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