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DiffusionGemma

Added Sep 19, 2026Open weights

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Use in the app

DiffusionGemma is a high-speed diffusion-based version of Gemma 4 26B A4B. It supports optional reasoning and a 262,144-token context window. Temperature, min-p, seed, minimum output tokens, logit bias, bad words, and allowed token IDs are unavailable; omit these parameters to use native diffusion sampling.

  • Reasoning
Input
Text
Output
Text
Reasoning effort
none · xhigh
Discovery tier
Open weights

Pricing

USD per 1M tokens
Input
$0.05
Output
$0.15
Cache read
$0.025

Reference prices as published by the model provider. API example

Specifications

Context window
262.1K
Max output
32.8K
Average output (7 days)
266 tokens
Longer than 28% of 473 models

Side by side

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Public evaluations

Benchmarks

Independent evaluation results, with how each score ranks among the models in the Noumen catalog.

Intelligence Index

9.5

Better than 19% of 326 scored models

3.8Catalog models by score55.1

Indexes

  • Coding Index

    19.7

    Composite of the coding evaluations

    Better than 13% of 168 scored models

Agentic work

  • GDPval-AAv2.1

    321 Elo

    Economically valuable occupational tasks, rated head to head

    Better than 4% of 187 scored models

Document reasoning

  • AA-LCRv1.1

    19.7%

    Reasoning across long documents

    Better than 8% of 309 scored models

Reasoning and knowledge

  • Humanity’s Last Exam

    10.8%

    Expert-level questions across academic fields

    Better than 33% of 323 scored models

  • GPQA Diamond

    66.9%

    Graduate-level science questions

    Better than 25% of 291 scored models

  • IFBench

    59.5%

    Following precise output instructions

    Better than 58% of 215 scored models

Legacy evaluations

  • AA-LCR (unversioned)

    19.7%

    Long-context reasoning, earlier grading

    Better than 8% of 309 scored models

Scores from Artificial Analysis, updated Oct 26, 2026. Artificial Analysis

Developers

Use it through the API

Noumen’s API is OpenAI-compatible: any Chat Completions client works with a base URL and a key.

Read the quickstart
curl https://www.noumen.xyz/api/v1/chat/completions \
  -H "Authorization: Bearer $NOUMEN_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "google/diffusiongemma",
    "reasoning_effort": "none",
    "messages": [{ "role": "user", "content": "Explain this stack trace." }]
  }'
import os
from openai import OpenAI

client = OpenAI(base_url="https://www.noumen.xyz/api/v1", api_key=os.environ["NOUMEN_API_KEY"])
reply = client.chat.completions.create(
    model="google/diffusiongemma",
    messages=[{"role": "user", "content": "Explain this stack trace."}],
)
print(reply.choices[0].message.content)

Google

Other Google models, starting with the same family.