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Claude Fable 5.1 vs Gemma 4 12B

Claude Fable 5.1 leads the LLM Stats Score 55.9 to 22.0.

Anthropic · Google · Updated for 2026

Which is better?

Claude Fable 5.1 leads the overall LLM Stats Score 55.9 to 22.0, ranking #2 overall.

In the 1 individual benchmarks reported for both models, Claude Fable 5.1 wins 1; this is a narrower head-to-head signal than the composite indexes.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose Claude Fable 5.1

  • overall performance matters — it scores 55.9 and ranks #2 on LLM Stats
  • your work emphasizes reasoning — it leads those capability indexes
  • you value its reported benchmark strengths — it wins 1 of 1 exact shared results
  • you want the most recent training data — it shipped Sep 2026

Choose Gemma 4 12B

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

At a glance

The differences that matter most.

Claude Fable 5.1
Anthropic
Gemma 4 12B
Google
Core performance indexes
LLM Stats Score
55.9
#2
22.0
#179
Reasoning
53.0
#5
23.0
#166
Cost, coverage & limits
Benchmark wins
1 of 1
0 of 1
Input price
$10.00 / M
— / M
Output price
$50.00 / M
— / M
Context window
1,000,000
—

Capability indexes

Additional strengths measured across groups of related public benchmarks

1 shared
Index
Claude Fable 5.1
Gemma 4 12B
Vision
41.8#1
10.9#113
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

7 reported for Claude Fable 5.1 · 15 for Gemma 4 12B

1 shared

Claude Fable 5.1 outperforms in 1 benchmarks (Humanity's Last Exam), while Gemma 4 12B is better at 0 benchmarks.

Claude Fable 5.1 significantly outperforms across most benchmarks.

Fri Sep 11 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Context Window

Maximum input and output token capacity

Only Claude Fable 5.1 specifies input context (1,000,000 tokens). Only Claude Fable 5.1 specifies output context (128,000 tokens).

Anthropic
Claude Fable 5.1
Input1,000,000 tokens
Output128,000 tokens
Google
Gemma 4 12B
Input- tokens
Output- tokens
Fri Sep 11 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Claude Fable 5.1 and Gemma 4 12B support multimodal inputs.

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

Claude Fable 5.1

Text
Images
Audio
Video

Gemma 4 12B

Text
Images
Audio
Video

License

Usage and distribution terms

Claude Fable 5.1 is licensed under a proprietary license, while Gemma 4 12B uses Apache 2.0.

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

Claude Fable 5.1

Proprietary

Closed source

Gemma 4 12B

Apache 2.0

Open weights

Release Timeline

When each model was launched

Claude Fable 5.1 was released on 2026-09-01, while Gemma 4 12B was released on 2026-05-23.

Claude Fable 5.1 is 3 months newer than Gemma 4 12B.

Claude Fable 5.1

Sep 1, 2026

1 weeks ago

3mo newer
Gemma 4 12B

May 23, 2026

3 months ago

Knowledge Cutoff

When training data ends

Gemma 4 12B has a documented knowledge cutoff of 2025-01-01, while Claude Fable 5.1's cutoff date is not specified.

We can confirm Gemma 4 12B's training data extends to 2025-01-01, but cannot make a direct comparison without Claude Fable 5.1's cutoff date.

Claude Fable 5.1

—

Gemma 4 12B

Jan 2025

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against Claude Fable 5.1 and Gemma 4 12B side-by-side, then vote on the output you prefer.

Claude Fable 5.1
✓ Preferred
Gemma 4 12B
Open in Playground

FAQ

Common questions about Claude Fable 5.1 vs Gemma 4 12B.

Which is better, Claude Fable 5.1 or Gemma 4 12B?

Claude Fable 5.1 leads the LLM Stats Score 55.9 to 22.0. Claude Fable 5.1 is made by Anthropic and Gemma 4 12B is made by Google. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Claude Fable 5.1 compare to Gemma 4 12B in benchmarks?

Claude Fable 5.1 scores OSWorld 2.0: 77.9%, CursorBench v3.2: 73.4%, Humanity's Last Exam: 65.0%, GDPval-AA: 61.8%, Terminal-Bench 4.0: 55.8%. Gemma 4 12B scores FLEURS: 93.1%, MMMLU: 83.4%, MathVision: 79.7%, GPQA: 78.8%, AIME 2026: 77.5%.

What are the context window sizes for Claude Fable 5.1 and Gemma 4 12B?

Claude Fable 5.1 supports 1.0M tokens and Gemma 4 12B 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 5.1 and Gemma 4 12B?

Key differences include LLM Stats Score (55.9 vs 22.0), licensing (Proprietary vs Apache 2.0). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Fable 5.1 and Gemma 4 12B?

Claude Fable 5.1 is developed by Anthropic and Gemma 4 12B is developed by Google.

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