Sarvam Voice Agents users still running Bulbul V3 have a migration deadline tomorrow, November 10, 2026. The company set the date in its October 14 changelog and instructed users to move affected agents to Bulbul V4 before then.
The retirement applies to Voice Agents only. Bulbul V3 remains available through the standalone Text-to-Speech API, according to the same notice.
What needs changing
For each affected agent, open Settings, go to Speaking, change the model to Bulbul V4 and select a voice. Sarvam’s voice configuration guide, checked on November 9, repeats the deadline and provides a V3-to-V4 voice-name mapping for teams that want to retain a familiar voice.
Use that mapping rather than assuming an old display name is unchanged. The guide also recommends selecting V4 for new agents. Neither notice specifies a shutdown time or timezone.
A practical check before the deadline
For teams managing several agents, a short inventory is a useful starting point: record each agent’s current model, chosen voice and owner. Prioritise the agents used in customer conversations, then check less frequently used ones that could otherwise be missed.
After making the change, a sensible acceptance check is to listen to the opening greeting and a few representative exchanges. Include the names, numbers and languages your callers commonly encounter. Record the selected V4 voice and any follow-up work so the handover is clear to colleagues.
Those checks are practical migration advice, rather than additional requirements announced by Sarvam. The immediate task is to identify any Voice Agents still using V3 and complete the documented model-and-voice change before November 10.
Cover: conceptual illustration of a voice-model transition, created with AI for Makhana Mornings.
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