Llama 3.1 405B benchmarks, pricing and specs
Llama 3.1 405B is a Meta model released on July 23, 2024 that takes text input and produces text. It is now listed as a legacy model. Its price is not published and accepts up to 128,000 tokens of context. It scores 1335 Elo on Arena Text (Arena, measured October 8, 2026).
- Context window
- 128K
- Arena Text
- 1335 Elo
Data verified October 12, 2026 · Dataset 2026-10-12
Key facts
- Provider
- Meta
- Model family
- Llama 3.1
- Release date
- July 23, 2024
- Status
- Legacy
- Access
- open weights
- API model id
- Not reported
- Context window
- 128,000 tokens
- Max output
- Not reported
- Input
- text
- Output
- text
- Task families
- text
- Declared capabilities
- reasoning
Llama 3.1 405B pricing
Independent benchmark results
Scores come from independent evaluators that ran the model themselves, pinned to a dated snapshot. Rank is among current models in the same snapshot. Meta's own launch figures are listed under strengths with the publisher named, because they are not measured the same way.
| Benchmark | Score | Rank | Measured | Source |
|---|---|---|---|---|
| Arena Text | 1335 Elo | Not ranked | October 8, 2026 | Arena · 2026-10-12 |
Strengths, cautions and best uses
Strengths
- Llama 3.1 405B records open-weight access for text inputs and a published 128,000-token context window
Cautions
- This record is marked legacy; confirm current availability and migration requirements before adoption
Best for
- Historical large open-weight evaluations with 128,000-token context
Alternatives to Llama 3.1 405B
The closest current textmodels by price. The cheapest model that scores as well or better is listed first; failing that, the cheapest one within 3% of the benchmark's scale.
DeepSeek-R1
- 63 points higher on Arena Text, 1398 vs 1335
- From DeepSeek
Gemini 2.5 Pro
- 110 points higher on Arena Text, 1445 vs 1335
- 1.05M context window vs 128K
- From Google
GPT-4.1
- 80 points higher on Arena Text, 1415 vs 1335
- 1.05M context window vs 128K
- From OpenAI
GPT-4.1 mini
- 48 points higher on Arena Text, 1383 vs 1335
- 1.05M context window vs 128K
- From OpenAI
Llama 3.1 405B FAQ
What is the context window of Llama 3.1 405B?
Llama 3.1 405B accepts up to 128,000 tokens of context. That ranks #40 of 45 current text models by context length.
How does Llama 3.1 405B score on independent benchmarks?
Llama 3.1 405B scores 1335 Elo on Arena Text (Arena, measured October 8, 2026). These are independent evaluations, not Meta's own launch figures.
Is Llama 3.1 405B open source or API only?
Llama 3.1 405B is released as open weights that you can run yourself.
What are the best alternatives to Llama 3.1 405B?
The closest current alternatives by price and measured performance are DeepSeek-R1 (63 points higher on Arena Text, 1398 vs 1335), Gemini 2.5 Pro (110 points higher on Arena Text, 1445 vs 1335), GPT-4.1 (80 points higher on Arena Text, 1415 vs 1335) and GPT-4.1 mini (48 points higher on Arena Text, 1383 vs 1335).
Sources
- Introducing Llama 3.1 · Meta · official · verified August 6, 2026
- Arena leaderboard dataset (lmarena-ai/leaderboard-dataset) · Arena · independent · verified October 12, 2026 · CC-BY-4.0
Cite this page
Van Data Team. "Llama 3.1 405B Benchmarks, Pricing and Specs." AI Model Benchmark Dataset 2026-10-12. https://vandatateam.com/ai-model-benchmarks/llama-3-1-405b
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Production evaluation
Deciding whether Llama 3.1 405B fits your workload?
Public benchmarks narrow the shortlist. We test the finalists on your own tasks, data and cost limits, then build the routing and review controls to run the winner in production.
- Evaluation cases and acceptance thresholds tied to real work
- Model routing, fallbacks and cost controls