Changelog

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ElevenLabs Events, Embed Transcripts & SDK Update

• ElevenLabs agent events — underlying ElevenLabs server events are now forwarded via the elevenlabs_agent_event event type, giving you access to raw ElevenLabs Conversational AI events
• Transcript on embed — Transcripts are now available directly on embed sessions
• JavaScript SDK updated — Updated the @heygen/liveavatar-web-sdk package with new event types and improvements

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Auth Simplification & Session Filtering

• Authentication — Cleaned up documentation for which endpoints require which auth specifications
• New avatar_id filter on /v1/sessions — List sessions can now be filtered by an optional avatar_id query parameter

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Embeds, Image Avatars & More

• New /v2/embeddings endpoint with sandbox support — Embeds can now be created with Sandbox Mode available
• Built Image Avatar pipeline — Create a fully animated avatar from just a photo using the new validate and submit endpoints

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Improvements

• Update avatar endpoint — You can now change an avatar’s default voice
• Avatar and voice deletion untangled — Deleting a voice no longer affects its associated avatar, and vice versa
• ElevenLabs agent dynamic variables — Configure dynamic variables for ElevenLabs-powered agents that get replaced at session start
• Source events fixed in FULL Mode — avatar.say and avatar.repeat events now correctly return source_event_id

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ElevenLabs Scribe, Embed Improvements

• Added support for ElevenLabs Scribe, expanding ASR capabilities
• Embed Improvements
  • Default language selection, letting users set the language for their embed experience
  • Time limits, giving creators control over session duration

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Voice Settings & Fish Audio

• Added additional voice settings for more granular control over avatar speech
• Added access to Fish Audio as a TTS provider
• New [GET] /v1/languages endpoint to clarify which languages are currently supported

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ElevenLabs Integration

• The v1/secrets endpoint now accepts ElevenLabs API keys
• FULL Mode sessions can now start with your own ElevenLabs keys and voices
• Added integration with ElevenLabs Agent functionality

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LLM Plugin & Session Controls

• Introduced LLM Plugin for custom LLM configurations
• Added customizable session duration controls
• Transcription chunk events are now emitted in real time
• New endpoint to track user credit balances

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Session Configuration & LITE Mode

• New session configuration options for video codec selection (H.264 / VP8)
• Added video quality control settings
• Added voice customization options
• CUSTOM Mode has been renamed to LITE Mode (backward-compatible)
• Bug fix: resolved opening line speech issues

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Push-to-Talk

• Released Push-to-Talk functionality for avatar sessions
• Added accompanying documentation and integration guides

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Sandbox Mode & FULL Mode Improvements

• Introduced Sandbox Mode for testing without credit charges
• Made context optional in FULL Mode configurations, reducing required setup

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Custom Mode & Session List Updates

• Custom Mode now exposes LiveKit Agent token for developers to integrate their own agents
• Session List endpoint updated to use query parameters

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Transcription Endpoint

• New [GET] /v1/sessions/{session_id}/transcript endpoint
• Enables developers to retrieve transcriptions between users and avatars in FULL Mode sessions

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Sessions List Endpoint

• New [GET] /v1/sessions endpoint
• Allows listing of both active and previously active sessions