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Nemotron 3.5 Lightning vs Claude Fable 5.1

At a glance

NVIDIA's open 30B MoE built for high-throughput agentic workloads.

262K ctx$0.08/$0.20 per M

Anthropic's upgraded Mythos-class flagship, with the biggest gains in agentic coding, long-running agentic workflows, and knowledge work.

1M ctx$10.00/$50.00 per M
Demos
All demos

No shared demos for these models yet.

AI Output
All AI outputs

No captured outputs for these models yet.

Benchmarks
See rankings
Reasoning
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:OpenRouter
Cheaper99%
Reasoning
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:OpenRouter
Specs
262K
Context
131K
Max output
Aug 2026
Released
1M
Context
128K
Max output
Sep 2026
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input99%$0.08/M tokens
Output100%$0.20/M tokens
Cache read84%$0.04/M tokens
Live pricing, shown before you run
Input$10.00/M tokens
Output$50.00/M tokens
Cache read$0.25/M tokens
Cache write$12.50/M tokens
Web search$0.01/search
Chat with Nemotron 3.5 LightningGo to model
Chat with Claude Fable 5.1Go to model
Frequently Asked Questions: Nemotron 3.5 Lightning vs Claude Fable 5.1▼

Which is better, Nemotron 3.5 Lightning or Claude Fable 5.1?

▼

Both Nemotron 3.5 Lightning and Claude Fable 5.1 are capable AI models. The best choice depends on your specific use case: consider pricing, context window, speed, and which capabilities (vision, reasoning, audio) you need.

Which is cheaper, Nemotron 3.5 Lightning or Claude Fable 5.1?

▼

Nemotron 3.5 Lightning has a lower blended cost. Nemotron 3.5 Lightning: $0.08 input / $0.20 output. Claude Fable 5.1: $10.00 input / $50.00 output.

Which has a larger context window, Nemotron 3.5 Lightning or Claude Fable 5.1?

▼

Claude Fable 5.1 has a larger context window: Nemotron 3.5 Lightning supports 262K tokens vs Claude Fable 5.1 at 1M tokens.

Do both Nemotron 3.5 Lightning and Claude Fable 5.1 support vision?

▼

Claude Fable 5.1 supports vision/image input, but Nemotron 3.5 Lightning does not.

What are the key differences between Nemotron 3.5 Lightning and Claude Fable 5.1?

▼

Key differences: Nemotron 3.5 Lightning is significantly cheaper; only Claude Fable 5.1 supports vision input. Compare full specs on this page.

Which model should I choose for my use case?

▼

If cost is your priority, choose the cheaper option. If you need the highest intelligence for complex tasks, pick the higher-scoring model. For long documents or codebases, choose the larger context window. You can try both Nemotron 3.5 Lightning and Claude Fable 5.1 for free on idapt.app to see which performs better for your specific needs.

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