Llama 3.1 Tulu3 405B
Analysis Summary
Tulu3 405B from the Allen Institute for AI is an open research model built on Llama 3.1, intended for instruction-following and fine-tuning experiments rather than frontier performance. Its reasoning and coding scores sit well below current generation models, and it lacks agentic or tool-use benchmarks entirely.
For businesses, this makes it more suited to internal research, fine-tuning pipelines, or low-stakes automation than client-facing deployment. Its large parameter count also means it is costly to self-host without matching capability gains.
Teams already invested in open-weight infrastructure might use it for experimentation, but most production workloads would be better served by newer, more capable open or hosted alternatives.
Assessed July 29, 2026
Editorial notes
Llama 3.1 Tulu3 405B offers open-weight flexibility but trails far behind current reasoning and coding benchmarks, limiting its use to lightweight experimentation.
Rankings consider pricing, capabilities, benchmarks, and real-world applicability and are refreshed as new models launch. Feedback?
DFO Verdict
Llama 3.1 Tulu3 405B offers open-weight flexibility but trails far behind current reasoning and coding benchmarks, limiting its use to lightweight experimentation.
Benchmark scores
Magenta = intelligence · Ink = technical/agentic · Cyan = content & long-context · 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 #276 of 398 AI models we track for overall intelligence. Llama 3.1 Tulu3 405B is currently free to use via OpenRouter.
Dark bar = input · light bar = output, scaled to the priciest peer.
1M tokens ≈ 8 full-length novels or ~2,500 pages of business documents in a single request.
Strongest on content. The pulled-in value corner is the trade-off, and if the shape matters more than the price, this is your model.
Compare shapes side-by-side →
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.
