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Grok 4.5 vs Llama 3.1 8B

At a glance
xAIGrok 4.5

xAI's Opus-class flagship for frontier coding, agentic tool use, and knowledge work.

89500K ctx$2.00/$6.00 per M#6/92
MetaLlama 3.1 8B

Compact 8B model from Meta's Llama 3.1 series.

50131K ctx$0.02/$0.03 per M#76/92
AI Output
All AI outputs

No captured outputs for these models yet.

Benchmarks
See rankings
xAIGrok 4.5
Reasoning
CI 86.2-90.3
CodingInsufficient data
Sources:Epoch ECI·Epoch AI·Provider·OpenRouter· as of 2026-07-10
Smarter
Capability
CapabilityECI88.5
Reasoning & Knowledge
Graduate Science93.4%Factual Recall53.5%
Math
Math Problems—Competition Math97.8%
Agentic
Terminal Tasks83.3%
MetaLlama 3.1 8B
CodingInsufficient data
AgenticInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Cheaper
Capability
CapabilityECI50.3
Reasoning & Knowledge
Graduate Science25.9%Factual Recall—
Math
Math Problems22.9%Competition Math2.5%
Agentic
Terminal Tasks—
Specs
xAIGrok 4.5
500K
Context
16K
Max output
Jul 2026
Released
MetaLlama 3.1 8B
131K
Context
16K
Max output
Jul 2024
Released
Capabilities
xAIGrok 4.5
Vision
Audio
Reasoning
MetaLlama 3.1 8B
Vision
Audio
Reasoning
Pricing
xAIGrok 4.5
Live pricing, shown before you run
Input$2.00/M tokens
Output$6.00/M tokens
Cache read$0.50/M tokens
Web search$0.005/search
MetaLlama 3.1 8B
Live pricing, shown before you run
Input$0.02/M tokens
Output$0.03/M tokens
Chat with Grok 4.5Go to model
Chat with Llama 3.1 8BGo to model
Frequently Asked Questions: Grok 4.5 vs Llama 3.1 8B▼

Which is better, Grok 4.5 or Llama 3.1 8B?

▼

Based on the Capability Index, Grok 4.5 scores higher (88.5 vs 50.3). However, "better" depends on your use case — pricing, speed, context window, and specific capability needs all matter.

Which is cheaper, Grok 4.5 or Llama 3.1 8B?

▼

Llama 3.1 8B has a lower blended cost. Grok 4.5: $2.00 input / $6.00 output. Llama 3.1 8B: $0.02 input / $0.03 output.

Which has a larger context window, Grok 4.5 or Llama 3.1 8B?

▼

Grok 4.5 has a larger context window: Grok 4.5 supports 500K tokens vs Llama 3.1 8B at 131K tokens.

Do both Grok 4.5 and Llama 3.1 8B support vision?

▼

Grok 4.5 supports vision/image input, but Llama 3.1 8B does not.

What are the key differences between Grok 4.5 and Llama 3.1 8B?

▼

Key differences: Grok 4.5 has a notably higher capability index (38.2 point gap); Llama 3.1 8B is significantly cheaper; only Grok 4.5 supports vision input; only Grok 4.5 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 Grok 4.5 and Llama 3.1 8B for free on idapt.app to see which performs better for your specific needs.

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