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Claude Sonnet 5 vs Llama 3.1 8B

At a glance

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

801M ctx$2.00/$10.00 per M#26/92

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
CI 72.7-84.7Provisional
CodingInsufficient data
AgenticInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Smarter59%
Capability
CapabilityECI59%80.1
Reasoning & Knowledge
Graduate Science249%90.5%Factual Recall25.0%
Math
Math Problems—Competition Math3689%94.7%
CodingInsufficient data
AgenticInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Cheaper99%
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$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
Live pricing, shown before you run
Input98%$0.05/M tokens
Output99%$0.08/M tokens
Cache read88%$0.02/M tokens
Chat with Claude Sonnet 5Go to model
Chat with Llama 3.1 8BGo to model
Frequently Asked Questions: Claude Sonnet 5 vs Llama 3.1 8B▼

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

▼

Based on the Capability Index, Claude Sonnet 5 scores higher (80.1 vs 50.3). However, "better" depends on your use case — pricing, speed, context window, and specific capability needs all matter.

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

▼

Llama 3.1 8B has a lower blended cost. Claude Sonnet 5: $2.00 input / $10.00 output. Llama 3.1 8B: $0.05 input / $0.08 output.

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

▼

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

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

▼

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

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

▼

Key differences: Claude Sonnet 5 has a notably higher capability index (29.8 point gap); Llama 3.1 8B is significantly cheaper; 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 Claude Sonnet 5 and Llama 3.1 8B for free on idapt.app to see which performs better for your specific needs.

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