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Claude Opus 5.5 vs Llama 3.1 8B

At a glance

Anthropic's new flagship for demanding reasoning, coding, and long-horizon agentic work, succeeding Claude Opus 5.

1M ctx$4.00/$20.00 per M

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
CodingInsufficient data
AgenticInsufficient data
Sources:Epoch AI·OpenRouter· as of 2026-10-02
Capability
Capability—
Reasoning & Knowledge
Graduate Science236%90.6%Factual Recall72.2%
Math
Math Problems—Competition Math5900%100.0%
Agentic
Novel Reasoning92.5%
CodingInsufficient data
AgenticInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-10-02
Cheaper99%
Capability
CapabilityECI50.3
Reasoning & Knowledge
Graduate Science27.0%Factual Recall—
Math
Math Problems22.9%Competition Math1.7%
Agentic
Novel Reasoning—
Specs
1M
Context
128K
Max output
Sep 2026
Released
131K
Context
118K
Max output
Jul 2024
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input$4.00/M tokens
Output$20.00/M tokens
Cache read$0.20/M tokens
Cache write$5.00/M tokens
Web search$0.01/search
Live pricing, shown before you run
Input99%$0.05/M tokens
Output100%$0.08/M tokens
Cache read88%$0.02/M tokens
Chat with Claude Opus 5.5Go to model
Chat with Llama 3.1 8BGo to model
Frequently Asked Questions: Claude Opus 5.5 vs Llama 3.1 8B▼

Which is better, Claude Opus 5.5 or Llama 3.1 8B?

▼

Both Claude Opus 5.5 and Llama 3.1 8B 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 is cheaper, Claude Opus 5.5 or Llama 3.1 8B?

▼

Llama 3.1 8B has a lower blended cost. Claude Opus 5.5: $4.00 input / $20.00 output. Llama 3.1 8B: $0.05 input / $0.08 output.

Which has a larger context window, Claude Opus 5.5 or Llama 3.1 8B?

▼

Claude Opus 5.5 has a larger context window: Claude Opus 5.5 supports 1M tokens vs Llama 3.1 8B at 131K tokens.

Do both Claude Opus 5.5 and Llama 3.1 8B support vision?

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Claude Opus 5.5 supports vision/image input, but Llama 3.1 8B does not.

What are the key differences between Claude Opus 5.5 and Llama 3.1 8B?

▼

Key differences: Llama 3.1 8B is significantly cheaper; only Claude Opus 5.5 supports vision input; only Claude Opus 5.5 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 Opus 5.5 and Llama 3.1 8B for free on idapt.app to see which performs better for your specific needs.

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