Llama 3.1 Tulu3 405B
Analysis Summary
Llama 3.1 Tulu3 405B is Allen Institute for AI's instruction-tuned variant of Meta's Llama 3.1 405B, released in early 2025. With an intelligence index of 8.3, MMLU-Pro of 0.716, and GPQA of 0.516, it sits in the upper-mid tier of the open-weight landscape and competes reasonably with commercial models from 2024.
For business use, its 405B scale makes it capable on complex reasoning, long-form content, and structured analysis tasks. Coding capability is moderate, with a LiveCodeBench score of 0.291, making it adequate for lighter engineering support but not a specialist coding model. The main constraint is infrastructure: running 405B parameters requires significant compute, which limits its accessibility for smaller teams.
Organisations with the infrastructure to self-host large models and a need for open-weight flexibility will find it a strong general-purpose option. For teams without that infrastructure, a hosted commercial model will deliver better cost-performance.
Assessed June 17, 2026
Editorial notes
Llama 3.1 Tulu3 405B from Allen Institute for AI is a large open-weight model with strong MMLU-Pro and GPQA scores, offering competitive general reasoning for self-hosted enterprise deployments.
Rankings consider pricing, capabilities, benchmarks, and real-world applicability and are refreshed as new models launch. Feedback?
Performance Profile
How Llama 3.1 Tulu3 405B compares
Llama 3.1 Tulu3 405B ranks #260 of 380 AI models we track for overall intelligence. Llama 3.1 Tulu3 405B is currently free to use via OpenRouter.
Benchmark Scores
Intelligence
Technical
Benchmark data from Artificial Analysis and Hugging Face
How does Llama 3.1 Tulu3 405B stack up?
Compare side-by-side with other emerging models.
Model Information
| Provider | Allen Institute for AI |
| Release Date | January 30, 2025 |
| Status | Active |
Leaderboard Categories
Frequently asked questions about Llama 3.1 Tulu3 405B
How much does Llama 3.1 Tulu3 405B cost?
Llama 3.1 Tulu3 405B is currently available for free via OpenRouter.
Who created Llama 3.1 Tulu3 405B?
Llama 3.1 Tulu3 405B is developed by Allen Institute For AI and was released on January 30, 2025.
