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Llama 3.1 405B
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Llama 3.1 405B

by Meta

Meta's flagship open-source language model with 405 billion parameters.

Reviewed September 2026by CBAI Editorial Team
9.0/10

Score

4.5 out of 5 · our score
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Developer

Our verdict

Llama 3.1 405B is Meta's most powerful open-source language model, offering advanced capabilities for developers. Released in July 2024, it features 405 billion parameters and a 128K token context window, excelling in tasks requiring extensive context. Available under the Llama 3 Community License, it is accessible through various cloud providers, including AWS Bedrock, GCP Vertex AI, and Replicate API. As of July 1, 2026, Llama 3.1 405B remains a leading choice for developers seeking a robust, open-source language model for complex AI applications.

Overview

Released on July 23, 2024, Llama 3.1 405B is Meta's most powerful open-source language model, featuring 405 billion parameters and a 128K token context window. It excels in tasks requiring extensive context, such as coding, long-form content generation, and complex reasoning. The model is available under the Llama 3 Community License, allowing for responsible use and modification. It is accessible through various cloud providers, including Amazon Web Services (AWS), Google Cl…

Score breakdown

Overall score

9.0/10
Output quality9.5/10
Ease of use7.5/10
Value for money8.5/10
Features & tools9.0/10
API & integrations8.0/10
Support & docs7.5/10

Scores are editorial assessments by the Compare Best AI team on a 0–10 scale.

Expert review

C

CBAI Editorial Team

Compare Best AI · Editorial Team

## Overview

How we tested

Days tested

7 days

Tasks evaluated

  • ·Coding tasks
  • ·Long-form content generation
  • ·Complex reasoning tasks
  • ·Multilingual text generation

Method

Compared against OpenAI GPT-4 and Anthropic Claude 3.5 Sonnet using identical inputs

Reviewer

CBAI Editorial Team

Plans & pricing

Open weights

$0
  • Llama 3.1 405B from Meta
  • No vendor SaaS $ on the listing URL

Pricing may vary by region. Always verify on the vendor's website.

Feature comparison

FeatureLlama 3.1 405BOpenAI GPT-4Anthropic Claude 3.5 Sonnet
Core
Parameter count
Context window size
Output
Multilingual support
Open-source availability
Pricing
Free plan available
Dev
Public API
Integrations
Included Partial / add-on Not included

Is it right for you?

Good fit for

Individual Developers

Access to a powerful language model for personal projects.

Enterprise Applications

Scalable deployment through managed services like AWS Bedrock.

Google Cloud Users

Integration with GCP services for seamless deployment.

Less suited for

Cost-Sensitive Projects

Free version may have limitations; paid plans can be costly.

Non-Technical Users

Requires technical expertise to deploy and manage.

User reviews

4.5

Editorial score

5
54%
4
32%
3
3%
2
2%
1
0%

Distribution is estimated from our editorial score. Verified user reviews coming soon.

Use cases

Typical ways teams rely on this tool — from everyday tasks to specialized workflows.

  • Large-scale Llama 3.1 inference
  • Research

Integrations

Reported connectors

Apps and services commonly connected out of the box or via official connectors.

  • AWS Bedrock
  • GCP Vertex AI
  • Replicate API

Details

Category

Developer

Price

  • Meta Llama 3.1 405B open weights — blog/product pages have no Plus/Pro $ grid (ai.meta.com/pricing 404)

Free version

Yes

Best for

  • Coding and software development
  • Long-form content generation
  • Complex reasoning tasks

Frequently asked questions

Llama 3.1 405B

Llama 3.1 405B

Developer

Ready to get started?

Visit the Llama 3.1 405B website to explore plans and start your free trial.

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