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Llama 3.1 405B vs Claude Fable 5

At a glance

Meta's largest open-weight model at 405B parameters.

63#66/92

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

921M ctx$10.00/$50.00 per M#2/92
Agent Demos
All agent demos

No shared agent demos for these models yet.

AI Output
All AI outputs

No captured outputs for these models yet.

Benchmarks
See rankings
CodingInsufficient data
AgenticInsufficient data
Sources:Epoch ECI·Epoch AI· as of 2026-07-10
Capability
CapabilityECI62.7
Reasoning & Knowledge
Graduate Science50.9%Factual Recall—
Math
Math Problems49.8%Competition Math9.7%
Reasoning
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Smarter46%
Capability
CapabilityECI46%91.6
Reasoning & Knowledge
Graduate Science—Factual Recall68.3%
Math
Math Problems—Competition Math926%99.7%
Specs
—
Context
—
Max output
—
Released
1M
Context
128K
Max output
Jun 2026
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Pricing not available
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
Chat with Llama 3.1 405BGo to model
Chat with Claude Fable 5Go to model
Frequently Asked Questions: Llama 3.1 405B vs Claude Fable 5▼

Which is better, Llama 3.1 405B or Claude Fable 5?

▼

Based on the Capability Index, Claude Fable 5 scores higher (91.6 vs 62.7). However, "better" depends on your use case — pricing, speed, context window, and specific capability needs all matter.

Do both Llama 3.1 405B and Claude Fable 5 support vision?

▼

Claude Fable 5 supports vision/image input, but Llama 3.1 405B does not.

What are the key differences between Llama 3.1 405B and Claude Fable 5?

▼

Key differences: Claude Fable 5 has a notably higher capability index (28.9 point gap); 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 Llama 3.1 405B and Claude Fable 5 for free on idapt.app to see which performs better for your specific needs.

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