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Comparison · 2 models · Updated Oct 4, 2026

Llama 3.1 Nemotron Ultra 253B vs Nemotron VoiceChat

Too close to call on our weighted score (Llama 3.1 Nemotron Ultra 253B 65, Nemotron VoiceChat 65). The right pick depends on what you value most.

  1. NVIDIA

    Llama 3.1 Nemotron Ultra 253B

    Released Apr 7, 2025

    65/100
    • ECI—
    • PriceFree / Free
    • Context128K
    Full specs Remove Llama 3.1 Nemotron Ultra 253B

  2. NVIDIA

    Nemotron VoiceChat

    Released Mar 16, 2026

    65/100
    • ECI—
    • PriceFree / Free
    • Context128K
    Full specs Remove Nemotron VoiceChat

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01 — Verdict

Too close to call

It is close. Our weighted score puts them within a point (Llama 3.1 Nemotron Ultra 253B 65/100, Nemotron VoiceChat 65/100), so choose by what matters most for your work: Llama 3.1 Nemotron Ultra 253B on price. The score weighs price 50%, inputs & features 30%, context window 20%. None of the shared benchmarks cover every model here yet, so capability is left out of this verdict.

  • CapabilityNot enough dataNo independent benchmark covers every model here yet
  • Lowest priceSame priceLlama 3.1 Nemotron Ultra 253B Free · Nemotron VoiceChat Free per 1M tokens (3:1 blend)
  • Longest contextAbout the sameLlama 3.1 Nemotron Ultra 253B 128,000 · Nemotron VoiceChat 128,000 tokens
  • Widest inputsNemotron VoiceChatLlama 3.1 Nemotron Ultra 253B: Text · Nemotron VoiceChat: Text, Audio
  • Self-hostingAll open weightsEvery model here can be downloaded and run on your own hardware
How the score is built
MeasureWeightLlama 3.1 Nemotron Ultra 253BNemotron VoiceChat
Price50%100100
Inputs & features30%3535
Context window20%2424
Overall100%65/10065/100

Left out because at least one model lacks the data: capability. The remaining weights were rescaled.

02 — Side by side

Every spec in one table

Highlighted cells lead their row. Dashes mean the data is not published.

Llama 3.1 Nemotron Ultra 253B vs Nemotron VoiceChat specifications side by side
SpecificationLlama 3.1 Nemotron Ultra 253BNVIDIANemotron VoiceChatNVIDIA
Capability
Capabilities Index (ECI)——
ECI rank——
Price per million tokens
InputFreeFree
OutputFreeFree
Cached input——
Blended (3:1)FreeFree
Long-context rateSame rateSame rate
Price sourceOfficial Nvidia APIOfficial Nvidia API
Limits
Context window128,000 tokens128,000 tokens
Max output8,192 tokens8,192 tokens
Inputs and features
TextYesYes
ImagesNoNo
PDFsNoNo
AudioNoYes
VideoNoNo
ReasoningYesNo
Tool callingYesYes
Structured outputNoNo
Availability
WeightsOpenOpen
API model IDnvidia/llama-3.1-nemotron-ultra-253b-v1nvidia/nemotron-voicechat
API providers11
ReleasedApr 7, 2025Mar 16, 2026
Knowledge cutoff——
03 — Cost

What would a month cost?

Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.

  • Llama 3.1 Nemotron Ultra 253BFree
  • Nemotron VoiceChatFree
04 — Questions

Which should you choose?

Which is better: Llama 3.1 Nemotron Ultra 253B or Nemotron VoiceChat?

It is close. Our weighted score puts them within a point (Llama 3.1 Nemotron Ultra 253B 65/100, Nemotron VoiceChat 65/100), so choose by what matters most for your work: Llama 3.1 Nemotron Ultra 253B on price. The score weighs price 50%, inputs & features 30%, context window 20%. None of the shared benchmarks cover every model here yet, so capability is left out of this verdict.

Which is cheaper, Llama 3.1 Nemotron Ultra 253B or Nemotron VoiceChat?

Llama 3.1 Nemotron Ultra 253B and Nemotron VoiceChat cost the same: Free input / Free output per million tokens.

Which scores higher on benchmarks?

There is no independent benchmark that covers both models yet. Llama 3.1 Nemotron Ultra 253B has not been scored yet and Nemotron VoiceChat has not been scored yet.

Which is better for coding?

There are no published SWE-bench Verified results for Llama 3.1 Nemotron Ultra 253B and Nemotron VoiceChat yet, so there is no like-for-like coding score. Test both on a sample of your own tasks. Both support tool calling for agent workflows.

Which has the bigger context window?

Llama 3.1 Nemotron Ultra 253B and Nemotron VoiceChat share the same 128,000-token context window. Maximum output per response: Llama 3.1 Nemotron Ultra 253B up to 8,192, Nemotron VoiceChat up to 8,192 tokens.

Which can read images, PDFs, audio or video?

Llama 3.1 Nemotron Ultra 253B accepts text; Nemotron VoiceChat accepts text and audio. Nemotron VoiceChat handles the widest range of inputs.

Are any of these open source?

Yes, both publish their weights, so you can self-host them.

Which is newer?

Nemotron VoiceChat is the newest, released Mar 16, 2026. Llama 3.1 Nemotron Ultra 253B came out Apr 7, 2025.

How do you decide the winner?

Each model gets a 0–100 score on capability (50%, independent benchmark results); price (25%, blended price per million tokens (3 input : 1 output), log scale); inputs & features (15%, image, PDF, audio and video input, tool calling, structured output and reasoning); context window (10%, maximum tokens per request, log scale). Dimensions missing for any model are dropped and the remaining weights rescaled, so every model is judged on the same evidence. Specs and prices come from public model listings and the labs’ own API pages; capability scores come from independent benchmark runs. Data updated Oct 4, 2026.

05 — Keep comparing

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