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Claude Fable 5 vs Llama 3.1 8B

At a glance

Anthropic's Mythos-class flagship for ambitious, long-running professional work.

921M ctx$10.00/$50.00 per M#2/92

Compact 8B model from Meta's Llama 3.1 series.

50131K ctx$0.05/$0.08 per M#76/92
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
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Smarter82%
Capability
CapabilityECI82%91.6
Reasoning & Knowledge
Graduate Science—Factual Recall68.3%
Math
Math Problems—Competition Math3889%99.7%
CodingInsufficient data
AgenticInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Cheaper100%
Capability
CapabilityECI50.3
Reasoning & Knowledge
Graduate Science25.9%Factual Recall—
Math
Math Problems22.9%Competition Math2.5%
Specs
1M
Context
128K
Max output
Jun 2026
Released
131K
Context
66K
Max output
Jul 2024
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input$10.00/M tokens
Output$50.00/M tokens
Cache read$1.00/M tokens
Cache write$12.50/M tokens
Web search$0.01/search
Live pricing, shown before you run
Input99%$0.05/M tokens
Output100%$0.08/M tokens
Cache read98%$0.02/M tokens
Chat with Claude Fable 5Go to model
Chat with Llama 3.1 8BGo to model
Frequently Asked Questions: Claude Fable 5 vs Llama 3.1 8B▼

Which is better, Claude Fable 5 or Llama 3.1 8B?

▼

Based on the Capability Index, Claude Fable 5 scores higher (91.6 vs 50.3). However, "better" depends on your use case — pricing, speed, context window, and specific capability needs all matter.

Which is cheaper, Claude Fable 5 or Llama 3.1 8B?

▼

Llama 3.1 8B has a lower blended cost. Claude Fable 5: $10.00 input / $50.00 output. Llama 3.1 8B: $0.05 input / $0.08 output.

Which has a larger context window, Claude Fable 5 or Llama 3.1 8B?

▼

Claude Fable 5 has a larger context window: Claude Fable 5 supports 1M tokens vs Llama 3.1 8B at 131K tokens.

Do both Claude Fable 5 and Llama 3.1 8B support vision?

▼

Claude Fable 5 supports vision/image input, but Llama 3.1 8B does not.

What are the key differences between Claude Fable 5 and Llama 3.1 8B?

▼

Key differences: Claude Fable 5 has a notably higher capability index (41.3 point gap); Llama 3.1 8B is significantly cheaper; only Claude Fable 5 supports vision input; only Claude Fable 5 offers extended reasoning mode. 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 Claude Fable 5 and Llama 3.1 8B for free on idapt.app to see which performs better for your specific needs.

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