Model Comparison
Claude 3 Opus vs Llama 3.1 405B InstructWhich is better in 2026?
Llama 3.1 405B Instruct significantly outperforms across most benchmarks. Llama 3.1 405B Instruct is 33.7x cheaper per token.
Verdict: Claude 3 Opus vs Llama 3.1 405B Instruct — which is better?
Claude 3 Opus (by Anthropic) and Llama 3.1 405B Instruct (by Meta) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.
Claude 3 Opus outperforms in 0 benchmarks, while Llama 3.1 405B Instruct is better at 8 benchmarks (ARC-C, DROP, GPQA, GSM8k, HumanEval, MATH, MMLU, MMLU-Pro). Llama 3.1 405B Instruct significantly outperforms across most benchmarks.
On price, Llama 3.1 405B Instruct is roughly 33.7x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Claude 3 Opus also accepts a larger context window (200,000 input tokens), making it the stronger choice for long documents and large codebases.
Choose Claude 3 Opus if…
- you process long inputs — it offers a 200,000 token context window
Choose Llama 3.1 405B Instruct if…
- you want the strongest raw capability — it leads on 8 of 8 shared benchmarks
- cost matters — it's about 33.7x cheaper per token
- you want the most recent training data — it shipped Jul 2024
- you need open weights you can self-host or fine-tune
Performance Benchmarks
Comparative analysis across standard metrics
Claude 3 Opus outperforms in 0 benchmarks, while Llama 3.1 405B Instruct is better at 8 benchmarks (ARC-C, DROP, GPQA, GSM8k, HumanEval, MATH, MMLU, MMLU-Pro).
Llama 3.1 405B Instruct significantly outperforms across most benchmarks.
Arena Performance
Human preference votes
Pricing Analysis
Price comparison per million tokens
For input processing, Claude 3 Opus ($15.00/1M tokens) is 16.9x more expensive than Llama 3.1 405B Instruct ($0.89/1M tokens).
For output processing, Claude 3 Opus ($75.00/1M tokens) is 84.3x more expensive than Llama 3.1 405B Instruct ($0.89/1M tokens).
In conclusion, Claude 3 Opus is more expensive than Llama 3.1 405B Instruct.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Claude 3 Opus accepts 200,000 input tokens compared to Llama 3.1 405B Instruct's 128,000 tokens. Claude 3 Opus can generate longer responses up to 200,000 tokens, while Llama 3.1 405B Instruct is limited to 128,000 tokens.
Input Capabilities
Supported data types and modalities
Claude 3 Opus supports multimodal inputs, whereas Llama 3.1 405B Instruct does not.
Claude 3 Opus can handle both text and other forms of data like images, making it suitable for multimodal applications.
Claude 3 Opus
Llama 3.1 405B Instruct
License
Usage and distribution terms
Claude 3 Opus is licensed under a proprietary license, while Llama 3.1 405B Instruct uses Llama 3.1 Community License.
License differences may affect how you can use these models in commercial or open-source projects.
Proprietary
Closed source
Llama 3.1 Community License
Open weights
Release Timeline
When each model was launched
Claude 3 Opus was released on 2024-02-29, while Llama 3.1 405B Instruct was released on 2024-07-23.
Llama 3.1 405B Instruct is 5 months newer than Claude 3 Opus.
Feb 29, 2024
2.3 years ago
Jul 23, 2024
1.9 years ago
4mo newerKnowledge Cutoff
When training data ends
Neither model specifies a knowledge cutoff date.
Unable to compare the recency of their training data.
Provider Availability
Claude 3 Opus is available from Anthropic, Bedrock, Google. Llama 3.1 405B Instruct is available from Lambda, DeepInfra, Fireworks, Bedrock, Together, Hyperbolic, Google, Replicate.
Claude 3 Opus
Llama 3.1 405B Instruct
Outputs Comparison
Key Takeaways
Claude 3 Opus
View detailsAnthropic
Detailed Comparison
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FAQ
Common questions about Claude 3 Opus vs Llama 3.1 405B Instruct.