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Claude Fable 5.1 vs Nemotron 3.5 Lightning (30B A3B)

Claude Fable 5.1 leads the LLM Stats Score 56.8 to 22.3. Nemotron 3.5 Lightning (30B A3B) is 228.6x cheaper per token.

Anthropic · NVIDIA · Updated for 2026

Which is better?

Claude Fable 5.1 leads the overall LLM Stats Score 56.8 to 22.3, 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.

On price, Nemotron 3.5 Lightning (30B A3B) is roughly 228.6x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Claude Fable 5.1 also accepts a larger context window (1,000,000 input tokens), making it the stronger choice for long documents and large codebases.

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 value its reported benchmark strengths — it wins 1 of 1 exact shared results
  • you process long inputs — it offers a 1,000,000 token context window
  • you want the most recent training data — it shipped Sep 2026

Choose Nemotron 3.5 Lightning (30B A3B)

  • cost matters — it's about 228.6x cheaper per token
  • 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 3.5 Lightning (30B A3B)
NVIDIA
Core performance indexes
LLM Stats Score
56.8
#2
22.3
#169
Reasoning
53.9
#5
19.9
#184
Coding
36.0
#23
8.6
#173
Agents
41.9
#2
7.3
#131
Cost, coverage & limits
Benchmark wins
1 of 1
0 of 1
Input price
$10.00 / M
$0.05 / M
Output price
$50.00 / M
$0.20 / M
Context window
1,000,000
262,144

Capability indexes

Additional strengths measured across groups of related public benchmarks

1 shared
Index
Claude Fable 5.1
Nemotron 3.5 Lightning (30B A3B)
Tool use
30.7#12
2.7#160
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

7 reported for Claude Fable 5.1 · 13 for Nemotron 3.5 Lightning (30B A3B)

1 shared

Claude Fable 5.1 outperforms in 1 benchmarks (Humanity's Last Exam), while Nemotron 3.5 Lightning (30B A3B) is better at 0 benchmarks.

Claude Fable 5.1 significantly outperforms across most benchmarks.

Fri Sep 04 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Pricing Analysis

Price comparison per million tokens

Nemotron 3.5 Lightning (30B A3B) costs less

For input processing, Claude Fable 5.1 ($10.00/1M tokens) is 200.0x more expensive than Nemotron 3.5 Lightning (30B A3B) ($0.05/1M tokens).

For output processing, Claude Fable 5.1 ($50.00/1M tokens) is 250.0x more expensive than Nemotron 3.5 Lightning (30B A3B) ($0.20/1M tokens).

In conclusion, Claude Fable 5.1 is more expensive than Nemotron 3.5 Lightning (30B A3B).*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Fri Sep 04 2026 • llm-stats.com
Anthropic
Claude Fable 5.1
Input tokens$10.00
Output tokens$50.00
Best providerAnthropic
NVIDIA
Nemotron 3.5 Lightning (30B A3B)
Input tokens$0.05
Output tokens$0.20
Best providerDeepinfra
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Claude Fable 5.1 accepts 1,000,000 input tokens compared to Nemotron 3.5 Lightning (30B A3B)'s 262,144 tokens. Nemotron 3.5 Lightning (30B A3B) can generate longer responses up to 262,144 tokens, while Claude Fable 5.1 is limited to 128,000 tokens.

Anthropic
Claude Fable 5.1
Input1,000,000 tokens
Output128,000 tokens
NVIDIA
Nemotron 3.5 Lightning (30B A3B)
Input262,144 tokens
Output262,144 tokens
Fri Sep 04 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Claude Fable 5.1 supports multimodal inputs, whereas Nemotron 3.5 Lightning (30B A3B) 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 3.5 Lightning (30B A3B)

Text
Images
Audio
Video

License

Usage and distribution terms

Claude Fable 5.1 is licensed under a proprietary license, while Nemotron 3.5 Lightning (30B A3B) uses OpenMDW License v1.1.

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

Claude Fable 5.1

Proprietary

Closed source

Nemotron 3.5 Lightning (30B A3B)

OpenMDW License v1.1

Open weights

Release Timeline

When each model was launched

Claude Fable 5.1 was released on 2026-09-01, while Nemotron 3.5 Lightning (30B A3B) was released on 2026-08-11.

Claude Fable 5.1 is 1 month newer than Nemotron 3.5 Lightning (30B A3B).

Claude Fable 5.1

Sep 1, 2026

3 days ago

3w newer
Nemotron 3.5 Lightning (30B A3B)

Aug 11, 2026

3 weeks 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

Provider Availability

Claude Fable 5.1 is available from Anthropic. Nemotron 3.5 Lightning (30B A3B) is available from DeepInfra.

Claude Fable 5.1

anthropic logo
Anthropic
Input Price:Input: $10.00/1MOutput Price:Output: $50.00/1M

Nemotron 3.5 Lightning (30B A3B)

deepinfra logo
Deepinfra
Input Price:Input: $0.05/1MOutput Price:Output: $0.20/1M
* Prices shown are per million tokens

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 3.5 Lightning (30B A3B) side-by-side, then vote on the output you prefer.

Claude Fable 5.1
✓ Preferred
Nemotron 3.5 Lightning (30B A3B)
Open in Playground

FAQ

Common questions about Claude Fable 5.1 vs Nemotron 3.5 Lightning (30B A3B).

Which is better, Claude Fable 5.1 or Nemotron 3.5 Lightning (30B A3B)?

Claude Fable 5.1 leads the LLM Stats Score 56.8 to 22.3. Claude Fable 5.1 is made by Anthropic and Nemotron 3.5 Lightning (30B A3B) 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 3.5 Lightning (30B A3B) 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 3.5 Lightning (30B A3B) scores PinchBench: 85.4%, MMLU-Pro: 81.9%, GPQA: 75.4%, IFBench: 71.9%, AA-LCR: 52.0%.

Is Claude Fable 5.1 cheaper than Nemotron 3.5 Lightning (30B A3B)?

Nemotron 3.5 Lightning (30B A3B) is 200.0x cheaper for input tokens. Claude Fable 5.1 costs $10.00/M input and $50.00/M output via anthropic. Nemotron 3.5 Lightning (30B A3B) costs $0.05/M input and $0.20/M output via deepinfra.

What are the context window sizes for Claude Fable 5.1 and Nemotron 3.5 Lightning (30B A3B)?

Claude Fable 5.1 supports 1.0M tokens and Nemotron 3.5 Lightning (30B A3B) supports 262K 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 3.5 Lightning (30B A3B)?

Key differences include LLM Stats Score (56.8 vs 22.3), context window (1.0M vs 262K), input pricing ($10.00 vs $0.05/M), multimodal support (yes vs no), licensing (Proprietary vs OpenMDW License v1.1). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Fable 5.1 and Nemotron 3.5 Lightning (30B A3B)?

Claude Fable 5.1 is developed by Anthropic and Nemotron 3.5 Lightning (30B A3B) is developed by NVIDIA.

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