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Llama 3.1 405B vs Claude Sonnet 5

At a glance

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

63131K ctx#66/92

Anthropic's fifth-generation Sonnet — near-Opus intelligence at Sonnet speed and price.

801M ctx$2.00/$10.00 per M#26/92
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
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
CI 72.7-84.7Provisional
CodingInsufficient data
AgenticInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Smarter28%
Capability
CapabilityECI28%80.1
Reasoning & Knowledge
Graduate Science78%90.5%Factual Recall25.0%
Math
Math Problems—Competition Math874%94.7%
Specs
131K
Context
16K
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$2.00/M tokens
Output$10.00/M tokens
Cache read$0.20/M tokens
Cache write$2.50/M tokens
Web search$0.01/search
Chat with Llama 3.1 405BGo to model
Chat with Claude Sonnet 5Go to model
Frequently Asked Questions: Llama 3.1 405B vs Claude Sonnet 5▼

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

▼

Based on the Capability Index, Claude Sonnet 5 scores higher (80.1 vs 62.7). However, "better" depends on your use case — pricing, speed, context window, and specific capability needs all matter.

Which has a larger context window, Llama 3.1 405B or Claude Sonnet 5?

▼

Claude Sonnet 5 has a larger context window: Llama 3.1 405B supports 131K tokens vs Claude Sonnet 5 at 1M tokens.

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

▼

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

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

▼

Key differences: Claude Sonnet 5 has a notably higher capability index (17.4 point gap); only Claude Sonnet 5 supports vision input; only Claude Sonnet 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 Sonnet 5 for free on idapt.app to see which performs better for your specific needs.

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