Compare

AssemblyAI Universal-3 Pro vs AssemblyAI Universal-3.5 Pro

Pricing per million tokens, context window, capabilities — pulled from each provider's public docs. All 2 are available via the same AIgateway OpenAI-compatible endpoint; flip the model string to switch.

Search2/4
AssemblyAI Universal-3 Pro
assemblyai/universal-3-pro
AssemblyAI Universal-3.5 Pro
assemblyai/universal-3.5-pro
Provider
AssemblyAI
AssemblyAI
Family
Universal
Universal
Modality
audio-stt
audio-stt
Context window
Max output
Released
2026-05-22
2026-08-25
License
Proprietary
Proprietary
Per minute
$0.0035 /min
$0.0035 /min
Tools
Streaming
Vision
JSON mode
Reasoning
Prompt caching
Batch API
Try it
View model →
View model →
AssemblyAI Universal-3 Pro
assemblyai/universal-3-pro
Full spec →

AssemblyAI's Universal 3 Pro speech recognition model for high-accuracy transcription.

Strengths
  • Speech-to-text transcription
Use cases
Meeting transcriptsCaptionsVoice agents
AssemblyAI Universal-3.5 Pro
assemblyai/universal-3.5-pro
Full spec →

AssemblyAI's Universal-3.5 Pro speech recognition model for fast, high-accuracy transcription.

Strengths
  • Speech-to-text transcription
Use cases
Meeting transcriptsCaptionsVoice agents

Compare with another

AssemblyAI Universal-3 Pro vs GPT-4o Transcribe
assemblyai/universal-3-pro · openai/gpt-4o-transcribe
SWITCH BETWEEN THEM

One key, all 2, one line different.

from openai import OpenAI

client = OpenAI(
    base_url="https://api.aigateway.sh/v1",
    api_key="sk-aig-...",
)

# AssemblyAI Universal-3 Pro
client.chat.completions.create(
    model="assemblyai/universal-3-pro",
    messages=[{"role":"user","content":"hello"}],
)

# AssemblyAI Universal-3.5 Pro
client.chat.completions.create(
    model="assemblyai/universal-3.5-pro",
    messages=[{"role":"user","content":"hello"}],
)
Get an AIgateway keyRun an eval on these →