Model Comparison

Claude Fable 5 vs DiffusionGemma 26B-A4BWhich is better in 2026?

Claude Fable 5 significantly outperforms across most benchmarks.

Verdict: Claude Fable 5 vs DiffusionGemma 26B-A4B — which is better?

Claude Fable 5 (by Anthropic) and DiffusionGemma 26B-A4B (by Google) 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.

Claude Fable 5 outperforms in 1 benchmarks (Humanity's Last Exam), while DiffusionGemma 26B-A4B is better at 0 benchmarks. Claude Fable 5 significantly outperforms across most benchmarks.

Choose Claude Fable 5 if…

  • you want the strongest raw capability — it leads on 1 of 1 shared benchmarks

Choose DiffusionGemma 26B-A4B if…

  • you want the most recent training data — it shipped Jun 2026
  • you need open weights you can self-host or fine-tune

Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

Claude Fable 5 outperforms in 1 benchmarks (Humanity's Last Exam), while DiffusionGemma 26B-A4B is better at 0 benchmarks.

Claude Fable 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 Claude Fable 5 specifies input context (1,000,000 tokens). Only Claude Fable 5 specifies output context (128,000 tokens).

Anthropic
Claude Fable 5
Input1,000,000 tokens
Output128,000 tokens
Google
DiffusionGemma 26B-A4B
Input- tokens
Output- tokens
Fri Jul 17 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Claude Fable 5 and DiffusionGemma 26B-A4B support multimodal inputs.

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

Claude Fable 5

Text
Images
Audio
Video

DiffusionGemma 26B-A4B

Text
Images
Audio
Video

License

Usage and distribution terms

Claude Fable 5 is licensed under a proprietary license, while DiffusionGemma 26B-A4B uses Apache 2.0.

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

Claude Fable 5

Proprietary

Closed source

DiffusionGemma 26B-A4B

Apache 2.0

Open weights

Release Timeline

When each model was launched

Claude Fable 5 was released on 2026-06-09, while DiffusionGemma 26B-A4B was released on 2026-06-10.

DiffusionGemma 26B-A4B is 0 month newer than Claude Fable 5.

Claude Fable 5

Jun 9, 2026

1 months ago

DiffusionGemma 26B-A4B

Jun 10, 2026

1 months ago

1d newer

Knowledge Cutoff

When training data ends

DiffusionGemma 26B-A4B has a documented knowledge cutoff of 2025-01-01, while Claude Fable 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 Claude Fable 5's cutoff date.

Claude Fable 5

—

DiffusionGemma 26B-A4B

Jan 2025

Outputs Comparison

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Key Takeaways

Anthropic
Larger context window (1,000,000 tokens)
Higher Humanity's Last Exam score (64.5% vs 11.9%)
Google
Has open weights

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against Claude Fable 5 and DiffusionGemma 26B-A4B side-by-side, then vote on the output you prefer.

Claude Fable 5
✓ Preferred
DiffusionGemma 26B-A4B
Open in Playground
AI Model Comparison Table
Feature
Anthropic
Claude Fable 5
Google
DiffusionGemma 26B-A4B

FAQ

Common questions about Claude Fable 5 vs DiffusionGemma 26B-A4B.

Which is better, Claude Fable 5 or DiffusionGemma 26B-A4B?

Claude Fable 5 significantly outperforms across most benchmarks. Claude Fable 5 is made by Anthropic and DiffusionGemma 26B-A4B is made by Google. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Claude Fable 5 compare to DiffusionGemma 26B-A4B in benchmarks?

Claude Fable 5 scores SWE-Bench Verified: 95.0%, FrontierSWE: 90.0%, OSWorld-Verified: 85.0%, Terminal-Bench 2.1: 84.3%, SWE-Bench Pro: 80.0%. DiffusionGemma 26B-A4B scores MMMLU: 81.5%, MMLU-Pro: 77.6%, GPQA: 73.2%, MathVision: 70.5%, AIME 2026: 69.1%.

What are the context window sizes for Claude Fable 5 and DiffusionGemma 26B-A4B?

Claude Fable 5 supports 1.0M tokens and DiffusionGemma 26B-A4B supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Claude Fable 5 and DiffusionGemma 26B-A4B?

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

Who makes Claude Fable 5 and DiffusionGemma 26B-A4B?

Claude Fable 5 is developed by Anthropic and DiffusionGemma 26B-A4B is developed by Google.

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