Project AURIONAI Use-Cases Research & Innovation
Fixie.ai
multimodal LLMfamily

Ultravox

Speech language models that join a Whisper encoder to an open LLM such as Llama through a trained adapter, so the model takes speech and text input directly.

Fixie.aiFixie.ai
Diagram of the Ultravox architecture joining an audio encoder to a Llama language model.
Levelfamily
Classmultimodal LLM
Parametersnot in the notes
Contextnot in the notes
Released5 Feb 2025
Opennessopen weights permissive
Runs onnot in the notes
Statusactive

Lineage

Fixie.aiUltravox v0.5 Llama 3.2 1B belongs to this familymultimodal LLM6 Feb 2025683.12M
Fixie.aiUltravox v0.5 Llama 3.1 8B belongs to this familymultimodal LLM5 Feb 2025687.31M
Where this comes from
Parent and child relations from model cards, Hugging Face base_model fields and the genealogy tables of the research notes. Confidence and evidence are the notes' own.

R&D Topics

Audio language models for speech understandingexemplar

Identity

Developer
Fixie.ai
Family
not in the notes
Released
5 Feb 2025 sourcesregistry date
Weights published
–
Record checked
12 Oct 2026
Where this comes from
Developer and dates from the research notes. Release date is the vendor's public announcement; weights date is when open weights were published.

Architecture and Size

Architecture
dense transformer
Total parameters
– sources
Active parameters
–
Checkpoint parameters
–
Context length
not in the notes
Input
text, audio
Output
text
Where this comes from
Parameter counts as the developer states them. Where the checkpoint holds a different total, both are shown (register A16).

Openness and Access

Openness
open weights permissive
Licence
MIT License sources
Access routes
open weights download
Where this comes from
The licence file governs over registry tags and aggregator labels.

Deployment

Runs on
not in the notes
Footprint
not in the notes
Runtimes
not in the notes
Where this comes from
Deployment tiers and runtimes as named in the notes. Footprint is the notes' figure, not a measurement by AURION.

Indonesia

Indonesian support
not stated
Regional languages
Thai, Vietnamese
Jakarta hosting
unknown
Languages
Checkpoint model cards list 42 languages
Where this comes from
Indonesia fields are carried on every model; unknown is an allowed value.

Benchmark Results

The notes record no benchmark result for this model.

Industry Use Cases

No industry use case links this model.

Sources

  1. github.com/fixie-ai/ultravox https://github.com/fixie-ai/ultravox
  2. huggingface.co/api/models?pipeline_tag=audio-text-to-text&so... https://huggingface.co/api/models?pipeline_tag=audio-text-to-text&sort=downloads&limit=50
  3. huggingface.co/fixie-ai/ultravox-v0_5-llama-3_2-1b https://huggingface.co/fixie-ai/ultravox-v0_5-llama-3_2-1b
  4. huggingface.co/fixie-ai/ultravox-v0_5-llama-3_1-8b https://huggingface.co/fixie-ai/ultravox-v0_5-llama-3_1-8b

To cite this page: Project AURION, AI Use-Cases Research & Innovation, "Ultravox", https://aurion.semai.id/models/fixie-ai-ultravox/, records of October 2026.