Meta · Llama 3 1 405b Instruct · active
Llama-3.1-405B-Instruct
Llama-3.1-405B-Instruct is an open-weight language model published by Meta.
meta-llama/Llama-3.1-405B-InstructProvider availability
Serving endpoints and pricing
This page represents one immutable developer model ID. Serving endpoints, pricing, regions, quantizations, and service tiers attach separately and never create duplicate model records.
Technical specification
Capabilities
Version lineage
Explicit unknowns
- Maximum output
- Knowledge cutoff
- API availability
- Provider pricing
Comparable peers
Related model comparisons
Questions
Llama-3.1-405B-Instruct FAQs
What is Llama-3.1-405B-Instruct?+
Llama-3.1-405B-Instruct 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-Instruct support?+
Llama-3.1-405B-Instruct's current record lists Text as input and Text as output.
How much context does Llama-3.1-405B-Instruct support?+
The current record lists a 131,072-token context window and does not report a maximum output length.
Is Llama-3.1-405B-Instruct available through an API?+
Llama-3.1-405B-Instruct's current primary-source record does not establish API availability. No provider endpoint is treated as available without direct provider evidence.
How large is Llama-3.1-405B-Instruct?+
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-Instruct support?+
Llama-3.1-405B-Instruct's recorded capabilities are chat, generation, and tools. Its supported tasks are text.
Can Llama-3.1-405B-Instruct be self-hosted?+
Llama-3.1-405B-Instruct is an open-weight model. Self-hosting is supported, and the recorded license is llama3.1.
Does Llama-3.1-405B-Instruct have related versions or aliases?+
No predecessor is recorded. No successor is recorded. Recorded aliases are meta-llama/Llama-3.1-405B-Instruct.
Which models can Llama-3.1-405B-Instruct be compared with?+
The current compatible peer set includes Llama-3.1-70B-Instruct, Llama-3.3-70B-Instruct, Llama-3.1-405B, Llama-4-Scout-17B-16E, and Qwen3.5-397B-A17B. Compatibility requires shared sourced modalities and tasks; it does not imply that one model is better. Browse model comparisons →
How current is the Model Markets record for Llama-3.1-405B-Instruct?+
Llama-3.1-405B-Instruct was last verified Aug 28, 2026 from Meta's primary source, “meta-llama/Llama-3.1-405B-Instruct developer model repository.” The evidence is classified as official fact.
Primary evidence