Identity
- Status
- active
- Developer ID
meta-llama/Llama-3.1-405B- Released
- Jul 23, 2024
- Version
- Llama-3.1-405B
- License
- llama3.1
MetaLlama 3.1 405B
Llama-3.1-405B is an open-weight language model published by Meta.
- Token context
- 131K tokens
- Inputs
- Text
- Outputs
- Text
- Released
- Jul 23, 2024
Providers & Pricing
1 current hosted offerings
No Directly Sourced Provider Price Yet
API pricing is provider-specific and stays unknown until a serving provider publishes an exact offering for this model version.
At a Glance
Model Facts
Capacity
- Token context
- 131K tokens
- Maximum output
- Unknown
- Total parameters
- 405.9B
- Active parameters
- Unknown
- Knowledge cutoff
- Not reported
Interface and Access
- Inputs
- Text
- Outputs
- Text
- API available
- Yes
- Open weights
- Yes
- Self-hostable
- Yes
- Reasoning
- No
- Vision
- No
- Tool calling
- No
- Capabilities
- generation
This page represents one developer model product. Dated API snapshots, serving endpoints, pricing, regions, quantizations, and service tiers attach as versioned aliases or provider details and never create duplicate public model records.
Version Lineage
PredecessorUnknown
SuccessorsUnknown
Aliasesmeta-llama/Llama-3.1-405B, meta-llama/Llama-3.1-405B
Explicit Unknowns
- Maximum output
- Knowledge cutoff
- Provider pricing
Primary Evidence
Sources and Observation Date
meta-llama/Llama-3.1-405B developer model repositoryMeta · observed Aug 28, 2026meta-llama/Llama-3.1-405B immutable Hub API metadataMeta · observed Aug 28, 2026meta-llama/Llama-3.1-405B README.md at b906e4dc842aMeta · observed Aug 28, 2026Hugging Face catalogHugging Face · observed Sep 2, 2026Together Ai catalogTogether Ai · observed Oct 19, 2026
Comparable Peers
Related Model Comparisons
| A | Pair | B | Context |
|---|---|---|---|
Llama 3.1 405BMeta | vs |  DeepSeek V4 Flash BaseDeepSeek | cross-developer peerstext |
Llama 3.1 405BMeta | vs | DeepSeek V4 Pro BaseDeepSeek | cross-developer peerstext |
Llama 3.1 405BMeta | vs | DeepSeek R1DeepSeek | cross-developer peerstext |
Llama 3.1 405BMeta | vs | DeepSeek V3DeepSeek | cross-developer peerstext |
Llama 3.1 405BMeta | vs | DeepSeek V3.2DeepSeek | cross-developer peerstext |
Llama 3.1 405BMeta | vs | family variantstext | |
Llama 3.1 405BMeta | vs | Llama 3.1 70BMeta | family variantstext |
Llama 3.1 405BMeta | vs | Llama 3.1 8BMeta | family variantstext |
Llama 3.1 405BMeta | vs | family variantstext | |
Llama 3.1 405BMeta | vs |  Kimi K2 InstructMoonshot AI | cross-developer peerstext |
Llama 3.1 405BMeta | vs | cross-developer peerstext | |
Llama 3.1 405BMeta | vs | cross-developer peerstext |
Questions
Llama 3.1 405B FAQs
What is Llama 3.1 405B?+
Llama-3.1-405B is an open-weight language model published by Meta. It is developed by Meta and its current sourced lifecycle status is active.
What inputs and outputs does Llama 3.1 405B support?+
Llama 3.1 405B's current record lists Text as input and Text as output.
How much context does Llama 3.1 405B support?+
The current record lists a 131K-token context window and does not report a maximum output length.
Is Llama 3.1 405B available through an API?+
Llama 3.1 405B is marked as API-available. The directly sourced provider records currently include Together Ai.
How large is Llama 3.1 405B?+
The current record lists 405.9B total parameters and an unknown active parameter count. Its architecture is LlamaForCausalLM.
What capabilities and tasks does Llama 3.1 405B support?+
Llama 3.1 405B's recorded capabilities are generation. Its supported tasks are text.
How much does Llama 3.1 405B cost through an API?+
No directly sourced token price is currently attached to Llama 3.1 405B. Missing prices remain unknown rather than being inferred from another model or provider.
Can Llama 3.1 405B be self-hosted?+
Llama 3.1 405B is an open-weight model. Self-hosting is supported, and the recorded license is llama3.1.
Does Llama 3.1 405B have related versions or aliases?+
No predecessor is recorded. No successor is recorded. Recorded aliases are meta-llama/Llama-3.1-405B.
Which models can Llama 3.1 405B be compared with?+
The current compatible peer set includes DeepSeek V4 Flash Base, DeepSeek V4 Pro Base, DeepSeek R1, DeepSeek V3, and DeepSeek V3.2. Compatibility requires shared sourced modalities and tasks; it does not imply that one model is better. Browse model comparisons →