Model Comparison

DiffusionGemma 26B-A4B vs Grok 4.5Which is better in 2026?

Grok 4.5 significantly outperforms across most benchmarks.

Verdict: DiffusionGemma 26B-A4B vs Grok 4.5 — which is better?

DiffusionGemma 26B-A4B (by Google) and Grok 4.5 (by xAI) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.

DiffusionGemma 26B-A4B outperforms in 0 benchmarks, while Grok 4.5 is better at 1 benchmark (GPQA). Grok 4.5 significantly outperforms across most benchmarks.

Choose DiffusionGemma 26B-A4B if…

  • you need open weights you can self-host or fine-tune

Choose Grok 4.5 if…

  • you want the strongest raw capability — it leads on 1 of 1 shared benchmarks
  • you want the most recent training data — it shipped Jul 2026

Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

DiffusionGemma 26B-A4B outperforms in 0 benchmarks, while Grok 4.5 is better at 1 benchmark (GPQA).

Grok 4.5 significantly outperforms across most benchmarks.

Fri Jul 17 2026 • llm-stats.com

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only Grok 4.5 specifies input context (500,000 tokens).

Google
DiffusionGemma 26B-A4B
Input- tokens
Output- tokens
xAI
Grok 4.5
Input500,000 tokens
Output- tokens
Fri Jul 17 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both DiffusionGemma 26B-A4B and Grok 4.5 support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

DiffusionGemma 26B-A4B

Text
Images
Audio
Video

Grok 4.5

Text
Images
Audio
Video

License

Usage and distribution terms

DiffusionGemma 26B-A4B is licensed under Apache 2.0, while Grok 4.5 uses a proprietary license.

License differences may affect how you can use these models in commercial or open-source projects.

DiffusionGemma 26B-A4B

Apache 2.0

Open weights

Grok 4.5

Proprietary

Closed source

Release Timeline

When each model was launched

DiffusionGemma 26B-A4B was released on 2026-06-10, while Grok 4.5 was released on 2026-07-08.

Grok 4.5 is 1 month newer than DiffusionGemma 26B-A4B.

DiffusionGemma 26B-A4B

Jun 10, 2026

1 months ago

Grok 4.5

Jul 8, 2026

1 weeks ago

4w newer

Knowledge Cutoff

When training data ends

DiffusionGemma 26B-A4B has a documented knowledge cutoff of 2025-01-01, while Grok 4.5's cutoff date is not specified.

We can confirm DiffusionGemma 26B-A4B's training data extends to 2025-01-01, but cannot make a direct comparison without Grok 4.5's cutoff date.

DiffusionGemma 26B-A4B

Jan 2025

Grok 4.5

—

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

Google
Has open weights
xAI
Larger context window (500,000 tokens)
Higher GPQA score (93.0% vs 73.2%)

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against DiffusionGemma 26B-A4B and Grok 4.5 side-by-side, then vote on the output you prefer.

DiffusionGemma 26B-A4B
✓ Preferred
Grok 4.5
Open in Playground
AI Model Comparison Table
Feature
Google
DiffusionGemma 26B-A4B
xAI
Grok 4.5

FAQ

Common questions about DiffusionGemma 26B-A4B vs Grok 4.5.

Which is better, DiffusionGemma 26B-A4B or Grok 4.5?

Grok 4.5 significantly outperforms across most benchmarks. DiffusionGemma 26B-A4B is made by Google and Grok 4.5 is made by xAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does DiffusionGemma 26B-A4B compare to Grok 4.5 in benchmarks?

DiffusionGemma 26B-A4B scores MMMLU: 81.5%, MMLU-Pro: 77.6%, GPQA: 73.2%, MathVision: 70.5%, AIME 2026: 69.1%. Grok 4.5 scores GPQA: 93.0%, Terminal-Bench 2.1: 83.3%, Artificial Analysis Coding Agent Index v1.1: 76.0%, SWE-Bench Pro: 64.7%, AA-Omniscience Index: 63.0%.

What are the context window sizes for DiffusionGemma 26B-A4B and Grok 4.5?

DiffusionGemma 26B-A4B supports an unknown number of tokens and Grok 4.5 supports 500K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between DiffusionGemma 26B-A4B and Grok 4.5?

Key differences include licensing (Apache 2.0 vs Proprietary). See the full comparison above for benchmark-by-benchmark results.

Who makes DiffusionGemma 26B-A4B and Grok 4.5?

DiffusionGemma 26B-A4B is developed by Google and Grok 4.5 is developed by xAI.

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