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Comparison · 2 models · Updated Oct 4, 2026

Llama 3.1 Nemotron Ultra 253B vs Seed 1.6 Vision

Too close to call on our weighted score (Llama 3.1 Nemotron Ultra 253B 65, Seed 1.6 Vision 63). 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. ByteDance Seed

    Seed 1.6 Vision

    Released Aug 15, 2025

    63/100
    • ECI—
    • Price$0.119 / $1.19
    • Context256K
    Full specs Remove Seed 1.6 Vision

  3. Add a model

    Make it a three-way comparison.

01 — Verdict

Too close to call

It is close. Our weighted score puts them within 2 points (Llama 3.1 Nemotron Ultra 253B 65/100, Seed 1.6 Vision 63/100), so choose by what matters most for your work: Llama 3.1 Nemotron Ultra 253B on price and Seed 1.6 Vision for long inputs. 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 priceLlama 3.1 Nemotron Ultra 253BLlama 3.1 Nemotron Ultra 253B Free · Seed 1.6 Vision $0.386 per 1M tokens (3:1 blend)
  • Longest contextSeed 1.6 VisionSeed 1.6 Vision 256,000 · Llama 3.1 Nemotron Ultra 253B 128,000 tokens
  • Widest inputsSeed 1.6 VisionLlama 3.1 Nemotron Ultra 253B: Text · Seed 1.6 Vision: Text, Images
  • Self-hostingLlama 3.1 Nemotron Ultra 253BPublishes downloadable weights
How the score is built
MeasureWeightLlama 3.1 Nemotron Ultra 253BSeed 1.6 Vision
Price50%10069
Inputs & features30%3570
Context window20%2436
Overall100%65/10063/100

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 Seed 1.6 Vision specifications side by side
SpecificationLlama 3.1 Nemotron Ultra 253BNVIDIASeed 1.6 VisionByteDance Seed
Capability
Capabilities Index (ECI)——
ECI rank——
Price per million tokens
InputFree (best)$0.119
OutputFree (best)$1.19
Cached input—$0.024
Blended (3:1)Free (best)$0.386
Long-context rateSame rateOver 32K: $0.178 / $2.37
Price sourceOfficial Nvidia APIOfficial Volcengine Ark API
Limits
Context window128,000 tokens256,000 tokens (best)
Max output8,192 tokens32,000 tokens (best)
Inputs and features
TextYesYes
ImagesNoYes
PDFsNoNo
AudioNoNo
VideoNoNo
ReasoningYesYes
Tool callingYesYes
Structured outputNoYes
Availability
WeightsOpenProprietary
API model IDnvidia/llama-3.1-nemotron-ultra-253b-v1doubao-seed-1-6-vision-250815
API providers12 (best)
ReleasedApr 7, 2025Aug 15, 2025
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
  • Seed 1.6 Vision$3.56
04 — Questions

Which should you choose?

Which is better: Llama 3.1 Nemotron Ultra 253B or Seed 1.6 Vision?

It is close. Our weighted score puts them within 2 points (Llama 3.1 Nemotron Ultra 253B 65/100, Seed 1.6 Vision 63/100), so choose by what matters most for your work: Llama 3.1 Nemotron Ultra 253B on price and Seed 1.6 Vision for long inputs. 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 Seed 1.6 Vision?

Llama 3.1 Nemotron Ultra 253B is cheaper at Free input / Free output per million tokens (official Nvidia API price). Seed 1.6 Vision costs $0.119 input / $1.19 output per million tokens (official Volcengine Ark API price). Llama 3.1 Nemotron Ultra 253B is listed as free.

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 Seed 1.6 Vision 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 Seed 1.6 Vision 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?

Seed 1.6 Vision has the largest context window at 256,000 tokens, against 128,000 for Llama 3.1 Nemotron Ultra 253B. Maximum output per response: Llama 3.1 Nemotron Ultra 253B up to 8,192, Seed 1.6 Vision up to 32,000 tokens.

Which can read images, PDFs, audio or video?

Llama 3.1 Nemotron Ultra 253B accepts text; Seed 1.6 Vision accepts text and images. Seed 1.6 Vision handles the widest range of inputs.

Are any of these open source?

Llama 3.1 Nemotron Ultra 253B publishes its weights and can be self-hosted; Seed 1.6 Vision is proprietary.

Which is newer?

Seed 1.6 Vision is the newest, released Aug 15, 2025. 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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