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Claude Fable 5.1 vs Nova 2 Omni

Claude Fable 5.1 leads the LLM Stats Score 56.8 to 25.9.

Anthropic · Amazon · Updated for 2026

Which is better?

Claude Fable 5.1 leads the overall LLM Stats Score 56.8 to 25.9, ranking #2 overall.

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

Choose Claude Fable 5.1

  • overall performance matters — it scores 56.8 and ranks #2 on LLM Stats
  • your work emphasizes reasoning and agents — it leads those capability indexes
  • you want the most recent training data — it shipped Sep 2026

Choose Nova 2 Omni

  • you are already invested in the Amazon ecosystem

At a glance

The differences that matter most.

Claude Fable 5.1
Anthropic
Nova 2 Omni
Amazon
Core performance indexes
LLM Stats Score
56.8
#2
25.9
#145
Reasoning
53.9
#5
28.2
#121
Agents
41.9
#2
4.5
#146
Cost, coverage & limits
Benchmark wins
—
—
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

2 shared
Index
Claude Fable 5.1
Nova 2 Omni
Vision
41.5#2
7.9#135
Tool use
30.7#12
16.3#81
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

7 reported for Claude Fable 5.1 · 18 for Nova 2 Omni

No common benchmarks found

Claude Fable 5.1 and Nova 2 Omnidon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

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
Amazon
Nova 2 Omni
Input- tokens
Output- tokens
Fri Sep 04 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Claude Fable 5.1 and Nova 2 Omni 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

Nova 2 Omni

Text
Images
Audio
Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

Claude Fable 5.1

Proprietary

Closed source

Nova 2 Omni

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Fable 5.1 was released on 2026-09-01, while Nova 2 Omni was released on 2025-12-02.

Claude Fable 5.1 is 9 months newer than Nova 2 Omni.

Claude Fable 5.1

Sep 1, 2026

3 days ago

9mo newer
Nova 2 Omni

Dec 2, 2025

9 months ago

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against Claude Fable 5.1 and Nova 2 Omni side-by-side, then vote on the output you prefer.

Claude Fable 5.1
✓ Preferred
Nova 2 Omni
Open in Playground

FAQ

Common questions about Claude Fable 5.1 vs Nova 2 Omni.

Which is better, Claude Fable 5.1 or Nova 2 Omni?

Claude Fable 5.1 leads the LLM Stats Score 56.8 to 25.9. Claude Fable 5.1 is made by Anthropic and Nova 2 Omni is made by Amazon. 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 Nova 2 Omni 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%. Nova 2 Omni scores AIME 2025: 92.1%, RefCOCOg: 86.3%, ScreenSpot: 85.4%, MMLU-Pro: 80.7%, Tau2 Telecom: 80.0%.

What are the context window sizes for Claude Fable 5.1 and Nova 2 Omni?

Claude Fable 5.1 supports 1.0M tokens and Nova 2 Omni 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 Nova 2 Omni?

Key differences include LLM Stats Score (56.8 vs 25.9). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Fable 5.1 and Nova 2 Omni?

Claude Fable 5.1 is developed by Anthropic and Nova 2 Omni is developed by Amazon.

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