generated: '2026-07-19'
method: searched
source: https://docs.ultravox.ai/changelog/news
scheme: dated-news
current_model: GLM 4.6 (default from 2025-12-22)
entries:
- date: '2025-12-03'
  breaking: false
  highlights: >-
    Default model switches to GLM 4.6 on Dec 22 for superior instruction
    following and tool calling; Llama remains available via ultravox-v0.6.
- date: '2025-01-03'
  breaking: false
  highlights: >-
    Model upgraded to Llama 3.3; improved tool performance via updated vLLM
    parser; new Call History dashboard.
- date: '2024-12-10'
  breaking: true
  highlights: >-
    WebSocket server-side integration; Telnyx and Plivo telephony providers
    added; languageHint parameter. Breaking: initiator deprecated in favor of
    firstSpeaker.
- date: '2024-11-14'
  breaking: false
  highlights: >-
    Ultravox v0.4.1 adds six languages; web console at app.ultravox.ai;
    initialOutputMedium enables text-based agent responses.
- date: '2024-10-18'
  breaking: false
  highlights: >-
    Call Stages for multi-stage conversations; client-implemented tools;
    webhooks added for call.started and call.ended.
- date: '2024-09-30'
  breaking: false
  highlights: >-
    Ultravox 70B model default; tools support introduced; new Flutter, Kotlin,
    and Python SDKs released.
- date: '2024-09-04'
  breaking: false
  highlights: >-
    Pricing reduced to $0.05/min; resume conversations via priorCallId; voice
    cloning added; model v0.4 released.