Model Comparison
Claude 3.5 Sonnet vs Llama 3.1 405B InstructWhich is better in 2026?
Claude 3.5 Sonnet significantly outperforms across most benchmarks. Llama 3.1 405B Instruct is 6.7x cheaper per token.
Verdict: Claude 3.5 Sonnet vs Llama 3.1 405B Instruct — which is better?
Claude 3.5 Sonnet (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 3.5 Sonnet outperforms in 6 benchmarks (DROP, GPQA, HumanEval, MATH, MMLU, MMLU-Pro), while Llama 3.1 405B Instruct is better at 1 benchmark (GSM8k). Claude 3.5 Sonnet significantly outperforms across most benchmarks.
On price, Llama 3.1 405B Instruct is roughly 6.7x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Claude 3.5 Sonnet also accepts a larger context window (200,000 input tokens), making it the stronger choice for long documents and large codebases.
Choose Claude 3.5 Sonnet if…
- you want the strongest raw capability — it leads on 6 of 7 shared benchmarks
- you process long inputs — it offers a 200,000 token context window
- you want the most recent training data — it shipped Oct 2024
Choose Llama 3.1 405B Instruct if…
- cost matters — it's about 6.7x cheaper per token
- you need open weights you can self-host or fine-tune
Performance Benchmarks
Comparative analysis across standard metrics
Claude 3.5 Sonnet outperforms in 6 benchmarks (DROP, GPQA, HumanEval, MATH, MMLU, MMLU-Pro), while Llama 3.1 405B Instruct is better at 1 benchmark (GSM8k).
Claude 3.5 Sonnet significantly outperforms across most benchmarks.
Arena Performance
Human preference votes
Pricing Analysis
Price comparison per million tokens
For input processing, Claude 3.5 Sonnet ($3.00/1M tokens) is 3.4x more expensive than Llama 3.1 405B Instruct ($0.89/1M tokens).
For output processing, Claude 3.5 Sonnet ($15.00/1M tokens) is 16.9x more expensive than Llama 3.1 405B Instruct ($0.89/1M tokens).
In conclusion, Claude 3.5 Sonnet 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 3.5 Sonnet accepts 200,000 input tokens compared to Llama 3.1 405B Instruct's 128,000 tokens. Claude 3.5 Sonnet 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 3.5 Sonnet supports multimodal inputs, whereas Llama 3.1 405B Instruct does not.
Claude 3.5 Sonnet can handle both text and other forms of data like images, making it suitable for multimodal applications.
Claude 3.5 Sonnet
Llama 3.1 405B Instruct
License
Usage and distribution terms
Claude 3.5 Sonnet 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 3.5 Sonnet was released on 2024-10-22, while Llama 3.1 405B Instruct was released on 2024-07-23.
Claude 3.5 Sonnet is 3 months newer than Llama 3.1 405B Instruct.
Oct 22, 2024
1.6 years ago
3mo newerJul 23, 2024
1.9 years ago
Knowledge Cutoff
When training data ends
Neither model specifies a knowledge cutoff date.
Unable to compare the recency of their training data.
Provider Availability
Claude 3.5 Sonnet is available from Anthropic, Bedrock, Google. Llama 3.1 405B Instruct is available from Lambda, DeepInfra, Fireworks, Bedrock, Together, Hyperbolic, Google, Replicate.
Claude 3.5 Sonnet
Llama 3.1 405B Instruct
Outputs Comparison
Key Takeaways
Claude 3.5 Sonnet
View detailsAnthropic
Detailed Comparison
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FAQ
Common questions about Claude 3.5 Sonnet vs Llama 3.1 405B Instruct.