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Llama 3.1 405B vs Claude Opus 5

At a glance

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

63131K ctx#66/92

Anthropic's flagship for demanding reasoning, coding, and long-horizon agentic work.

1M ctx$5.00/$25.00 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
CodingInsufficient data
AgenticInsufficient data
Sources:Epoch ECI·Epoch AI· as of 2026-07-10
Capability
CapabilityECI62.7
Reasoning & Knowledge
Graduate Science50.9%
Math
Math Problems49.8%Competition Math9.7%
Reasoning
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:OpenRouter
Capability
Capability—
Reasoning & Knowledge
Graduate Science—
Math
Math Problems—Competition Math—
Specs
131K
Context
16K
Max output
—
Released
1M
Context
128K
Max output
Jul 2026
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Pricing not available
Live pricing, shown before you run
Input$5.00/M tokens
Output$25.00/M tokens
Cache read$0.50/M tokens
Cache write$6.25/M tokens
Web search$0.01/search
Chat with Llama 3.1 405BGo to model
Chat with Claude Opus 5Go to model
Frequently Asked Questions: Llama 3.1 405B vs Claude Opus 5▼

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

▼

Both Llama 3.1 405B and Claude Opus 5 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 has a larger context window, Llama 3.1 405B or Claude Opus 5?

▼

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

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

▼

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

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

▼

Key differences: only Claude Opus 5 supports vision input; only Claude Opus 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 Opus 5 for free on idapt.app to see which performs better for your specific needs.

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