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Llama 3.1 405B vs Gemini 3.5 Flash

At a glance

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

63#66/92

Google's high-speed thinking model for agentic workflows, chat, and coding.

861.0M ctx$1.50/$9.00 per M#11/92
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%Research Math—
Coding
Real-World Coding—
Agentic
Novel Reasoning—
Reasoning
AgenticInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Smarter37%
Capability
CapabilityECI37%86.2
Reasoning & Knowledge
Graduate Science82%92.8%Factual Recall68.4%
Math
Math Problems—Competition Math883%95.6%Research Math39.0%
Coding
Real-World Coding79.3%
Agentic
Novel Reasoning72.1%
Specs
—
Context
—
Max output
—
Released
1.0M
Context
66K
Max output
May 2026
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Pricing not available
Live pricing, shown before you run
Input$1.50/M tokens
Output$9.00/M tokens
Reasoning$9.00/M tokens
Cache read$0.15/M tokens
Cache write$0.08/M tokens
Image input$1.50/M tokens
Audio input$3.00/M tokens
Web search$0.01/search
Chat with Llama 3.1 405BGo to model
Chat with Gemini 3.5 FlashGo to model
Frequently Asked Questions: Llama 3.1 405B vs Gemini 3.5 Flash▼

Which is better, Llama 3.1 405B or Gemini 3.5 Flash?

▼

Based on the Capability Index, Gemini 3.5 Flash scores higher (86.2 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 Gemini 3.5 Flash support vision?

▼

Gemini 3.5 Flash supports vision/image input, but Llama 3.1 405B does not.

What are the key differences between Llama 3.1 405B and Gemini 3.5 Flash?

▼

Key differences: Gemini 3.5 Flash has a notably higher capability index (23.5 point gap); only Gemini 3.5 Flash supports vision input; only Gemini 3.5 Flash 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 Gemini 3.5 Flash for free on idapt.app to see which performs better for your specific needs.

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