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Claude Fable 5.1 vs Nemotron Nano 9B v2

Claude Fable 5.1 leads the LLM Stats Score 56.8 to 18.6.

Anthropic · NVIDIA · Updated for 2026

Which is better?

Claude Fable 5.1 leads the overall LLM Stats Score 56.8 to 18.6, 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 coding — it leads those capability indexes
  • you want the most recent training data — it shipped Sep 2026

Choose Nemotron Nano 9B v2

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

At a glance

The differences that matter most.

Claude Fable 5.1
Anthropic
Nemotron Nano 9B v2
NVIDIA
Core performance indexes
LLM Stats Score
56.8
#2
18.6
#200
Reasoning
53.9
#5
17.4
#198
Coding
36.0
#23
14.6
#125
Cost, coverage & limits
Benchmark wins
—
—
Input price
$10.00 / M
— / M
Output price
$50.00 / M
— / M
Context window
1,000,000
—

Individual benchmarks

7 reported for Claude Fable 5.1 · 6 for Nemotron Nano 9B v2

No common benchmarks found

Claude Fable 5.1 and Nemotron Nano 9B v2don'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
NVIDIA
Nemotron Nano 9B v2
Input- tokens
Output- tokens
Mon Sep 07 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Claude Fable 5.1 supports multimodal inputs, whereas Nemotron Nano 9B v2 does not.

Claude Fable 5.1 can handle both text and other forms of data like images, making it suitable for multimodal applications.

Claude Fable 5.1

Text
Images
Audio
Video

Nemotron Nano 9B v2

Text
Images
Audio
Video

License

Usage and distribution terms

Claude Fable 5.1 is licensed under a proprietary license, while Nemotron Nano 9B v2 uses NVIDIA Open Model License Agreement .

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

Claude Fable 5.1

Proprietary

Closed source

Nemotron Nano 9B v2

NVIDIA Open Model License Agreement

Open weights

Release Timeline

When each model was launched

Claude Fable 5.1 was released on 2026-09-01, while Nemotron Nano 9B v2 was released on 2025-08-18.

Claude Fable 5.1 is 13 months newer than Nemotron Nano 9B v2.

Claude Fable 5.1

Sep 1, 2026

6 days ago

1.0yr newer
Nemotron Nano 9B v2

Aug 18, 2025

1.1 years ago

Knowledge Cutoff

When training data ends

Nemotron Nano 9B v2 has a documented knowledge cutoff of 2024-09-01, while Claude Fable 5.1's cutoff date is not specified.

We can confirm Nemotron Nano 9B v2's training data extends to 2024-09-01, but cannot make a direct comparison without Claude Fable 5.1's cutoff date.

Claude Fable 5.1

—

Nemotron Nano 9B v2

Sep 2024

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against Claude Fable 5.1 and Nemotron Nano 9B v2 side-by-side, then vote on the output you prefer.

Claude Fable 5.1
✓ Preferred
Nemotron Nano 9B v2
Open in Playground

FAQ

Common questions about Claude Fable 5.1 vs Nemotron Nano 9B v2.

Which is better, Claude Fable 5.1 or Nemotron Nano 9B v2?

Claude Fable 5.1 leads the LLM Stats Score 56.8 to 18.6. Claude Fable 5.1 is made by Anthropic and Nemotron Nano 9B v2 is made by NVIDIA. 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 Nemotron Nano 9B v2 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%. Nemotron Nano 9B v2 scores MATH-500: 97.8%, IFEval: 90.3%, AIME 2025: 72.1%, LiveCodeBench: 71.1%, BFCL_v3_MultiTurn: 66.9%.

What are the context window sizes for Claude Fable 5.1 and Nemotron Nano 9B v2?

Claude Fable 5.1 supports 1.0M tokens and Nemotron Nano 9B v2 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 Nemotron Nano 9B v2?

Key differences include LLM Stats Score (56.8 vs 18.6), multimodal support (yes vs no), licensing (Proprietary vs NVIDIA Open Model License Agreement ). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Fable 5.1 and Nemotron Nano 9B v2?

Claude Fable 5.1 is developed by Anthropic and Nemotron Nano 9B v2 is developed by NVIDIA.

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