Llama 3.1 Tulu3 405B
Analysis Summary
Llama 3.1 Tulu3 405B is Allen Institute for AI's large open-weight instruction-tuned model, built on the Llama 3.1 base. It shows reasonable general knowledge performance but weak scores on reasoning-heavy and coding benchmarks compared to current models.
For businesses, this suits self-hosted deployments where data control matters more than raw capability, such as internal knowledge tools or lightly supervised drafting tasks. It is not well suited to complex coding or agentic workflows given its limited coding and reasoning results.
As an open model, cost is largely determined by hosting infrastructure. Consider it only where self-hosting is a priority and task complexity is modest.
Assessed July 10, 2026
Editorial notes
Tulu3 405B from Allen Institute offers open-weight flexibility and solid knowledge recall, but reasoning and coding results trail current frontier models by a wide margin.
Rankings consider pricing, capabilities, benchmarks, and real-world applicability and are refreshed as new models launch. Feedback?
DFO Verdict
Tulu3 405B from Allen Institute offers open-weight flexibility and solid knowledge recall, but reasoning and coding results trail current frontier models by a wide margin.
Benchmark scores
Magenta = intelligence Ā· Ink = technical/agentic Ā· Cyan = content & long-context Ā· Grey = community benchmarks. Data: Artificial Analysis, Hugging Face.
8.3 Intelligence Index
How Llama 3.1 Tulu3 405B compares
Llama 3.1 Tulu3 405B ranks #270 of 393 AI models we track for overall intelligence. Llama 3.1 Tulu3 405B is currently free to use via OpenRouter.
Dark bar = input Ā· light bar = output, scaled to the priciest peer.
1M tokens ā 8 full-length novels or ~2,500 pages of business documents in a single request.
Strongest on intelligence. The pulled-in value corner is the trade-off, and if the shape matters more than the price, this is your model.
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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.
