27th Sep, 2025
Added Anthropic support for LLM
- Support for the following Anthropic models. Learn more about Anthropic models from their official website.
claude-sonnet-4
Added Sarvam and AssemblyAI transcriber support
- Sarvam transcriber for Speech to Text (STT) capabilities with 11 Indian languages including English, Hindi, Bengali, Tamil, Telugu, Kannada, Malayalam, Marathi, Gujarati, Punjabi, and Odia.
- AssemblyAI transcriber for Speech to Text (STT) capabilities with real-time English streaming capabilities
24th Sep, 2025
Concurrency model at sub-account scope
- Concurrency limits can now be configured at the sub-account level, allowing multiple calls or batches to run in parallel instead of being queued one after another. See how to configure concurrency when creating a sub-account in the (API doc)
Features
- Users can now attach a webhook URL to a batch at upload time. When the batch status changes —
processed
,scheduled
,queued
,running
,completed
orstopped
, updates will be sent to the webhook to track the progress of batches in real time.

15th Sep, 2025
Adding Voice AI Agents library including the following template agents to ease setting up and getting started with Bolna Voice AI Agents.
- Recruitment Voice AI agent
- Customer Support Voice AI agent
- Cart Abandonment Voice AI agent
- Lead Qualification Voice AI agent
- Onboarding Voice AI agent
- Front Desk Voice AI agent
- COD Confirmation Voice AI agent
- Announcements Voice AI agent
- Reminders Voice AI agent
- Surveys Voice AI agent
- Property Tech Voice AI agent
- Dentist Appointment Voice AI agent
- Salon Booking Voice AI agent
- Weekend Planner Voice AI agent
- Sales Credit Card Voice AI agent
- Sales Loans Voice AI agent
9th Sep, 2025
8th Sep, 2025
Passing headers in Custom Function tools
- Passing custom
headers
is now supported on function tooling.

Function tool example with headers