LLM Perks

Llama 3.1 405B

Free right now Frontier
Tool useOpen weights

Llama 3.1 405B is a language model with 405B parameters from Meta. It is currently free at 1 provider with up to 131K tokens of context. The model supports tool calling. Its weights are open, so it can also run locally.

Developer
Meta
Parameters
405B
Context
131K tokens
Type
Text
License
Open weights

Where to use Llama 3.1 405B for free

Each row is a separate free endpoint with its own limits.

ProviderContextLimitCard
Together AI
meta-llama/Llama-3.1-405B
131K Fair use (depends on server load) — Open

Quick start

curl https://api.together.xyz/v1/chat/completions \
  -H "Authorization: Bearer $TOGETHER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "meta-llama/Llama-3.1-405B",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

Example for Together AI. Any OpenAI-compatible client works: Cursor, Cline, OpenCode, Open WebUI.

Benchmarks

Intelligence Index
7.3
GPQA Diamond
51.5%
Humanity's Last Exam
4.0%
Terminal-Bench Hard
6.8%
τ²-Bench
19.0%
Long context (LCR)
25.3%

Source: Artificial Analysis · Llama 3.1 Instruct 405B

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FAQ

Is Llama 3.1 405B free?

Yes. As of October 31, 2026, Llama 3.1 405B is free at Together AI. Each provider has its own limits — see the table above.

What is the context window of Llama 3.1 405B?

The largest context among free routes is 131,072 tokens. Some providers cap it lower.

How do I call Llama 3.1 405B via API?

Use any OpenAI-compatible client with base URL https://api.together.xyz/v1, model ID meta-llama/Llama-3.1-405B, and a Together AI key.

How good is Llama 3.1 405B?

Artificial Analysis Intelligence Index: 7.3, GPQA Diamond: 52%. For comparison, the strongest free model in the catalog right now is GLM 5.3 Flash.

Is Llama 3.1 405B open-weight?

Yes, the weights are published — you can download and run it locally, for example with Ollama or LM Studio.