Llama 3.1-405B
Llama 3.1-405B is worth evaluating for rag, agents, and long context when its provider route and context window match the workload.
Use it for
- Teams evaluating rag, agents, and long context
- Workloads that can use a 128k context window
- Buyers comparing 2 tracked provider routes
Do not use it for
- Vision or document-understanding workloads
- Family
- Llama 3.1
- Released
- 2024-07-23
- Context
- 128k
- Parameters
- 405B
- Knowledge cutoff
- 2024-04
- Openness
- Open weights
- License
- Llama 3 CommunityCommercial use: conditional
Large-scale open-source AI for social technologies.
Cheapest of 2 routes · Replicate API
About
Meta's flagship Llama 3.1 model with 405B parameters and 128K context window. Open-weights model with strong reasoning and coding capabilities.
Llama 3.1-405B is an open-weight model in the Llama 3.1 family. The structured metadata tracks a 128k-token context window, function calling, tool use, and structured outputs. This page tracks provider routes through GCP Vertex AI and Replicate API, with the cheapest tracked route listed at $3.75 input and $3.75 output per 1M tokens. Headline tracked benchmarks include MMLU PRO 73.2.
Top use-case fit: coding, agents, and build tasks
RAG
Included by capability and metadata signals in the decision map.
Agents
Included by capability and metadata signals in the decision map.
Long context
Included by capability and metadata signals in the decision map.
Provider price ladder
Compare all 2Compare API pricing across 2 providers for input and output tokens, batch, and cached reads when available.
| Provider | Input / 1M | Output / 1M | Route |
|---|---|---|---|
| Replicate API | $3.75 | $3.75 | Serverless |
| GCP Vertex AI | $5.00 | $16.00 | Serverless |
Available via routers & gateways(13)
LiteLLM
GatewayOpen-source Python SDK and proxy server that unifies 100+ LLM APIs behind a single OpenAI-compatible interface, with load balancing, cost tracking, and configurable failover.
OpenRouter
HybridUnified hybrid gateway to 400+ models from 60+ providers via a single OpenAI-compatible API, with optional auto-routing that selects the best model per prompt.
Portkey
GatewayProduction AI gateway routing to 1,600+ LLMs with failover, load balancing, semantic caching, and guardrails; Apache 2.0 core is fully self-hostable with the complete feature set.
AIRouter
RouterCommercial LLM router that analyzes incoming requests and routes to the optimal model for cost/quality/latency via a drop-in OpenAI-compatible API, with a privacy-preserving embedding mode that avoids sending prompt content.
Helicone
GatewayObservability-first AI gateway with routing, caching, rate limiting, and request tracing; Apache 2.0 open-source core with a managed hosted tier for logging and analytics.
Kong AI Gateway
GatewayMulti-LLM AI gateway built on Kong Gateway 3.x, adding semantic routing, load balancing, guardrails, and MCP traffic analytics as plugins over Kong's existing API management platform.
Capabilities
Benchmark peer barsfor Classification
Benchmark scores(1)
| Benchmark | Score | Version | Source |
|---|---|---|---|
| MMLU PRO | 73.2 | — | https://huggingface.co/spaces/TIGER-Lab/MMLU-Pro |
Migration checks
No linked migration route is available for this model yet.
Frequently asked questions
What is the context window of Llama 3.1-405B?
Llama 3.1-405B has a context window of 128k tokens.
How much does Llama 3.1-405B cost?
Llama 3.1-405B pricing ranges from $3.75/1M to $5/1M input tokens depending on the provider.
When was Llama 3.1-405B released?
Llama 3.1-405B was released on 2024-07-23.
Which providers offer Llama 3.1-405B?
Llama 3.1-405B is available from 2 providers: GCP Vertex AI, Replicate API.
What benchmarks has Llama 3.1-405B been tested on?
Llama 3.1-405B has been evaluated on 1 benchmark, including MMLU PRO.
Large-scale open-source AI for social technologies.
Cheapest of 2 routes · Replicate API