Devstral Medium vs Llama 3.1 405B Instruct
Devstral Medium and Llama 3.1 405B Instruct are closely matched at 13.9 and 14.8 on the LLM Stats Score. Devstral Medium is 1.1x cheaper per token.
Mistral AI · Meta · Updated for 2026
Which is better?
Devstral Medium and Llama 3.1 405B Instruct are closely matched on the overall LLM Stats Score at 13.9 and 14.8.
On price, Devstral Medium is roughly 1.1x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose Devstral Medium
- cost matters — it's about 1.1x cheaper per token
- you want the most recent training data — it shipped Jul 2025
Choose Llama 3.1 405B Instruct
- you need open weights you can self-host or fine-tune
At a glance
The differences that matter most.
Individual benchmarks
1 reported for Devstral Medium · 18 for Llama 3.1 405B Instruct
Devstral Medium and Llama 3.1 405B Instructdon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, Devstral Medium ($0.40/1M tokens) is 2.2x cheaper than Llama 3.1 405B Instruct ($0.89/1M tokens).
For output processing, Devstral Medium ($2.00/1M tokens) is 2.2x more expensive than Llama 3.1 405B Instruct ($0.89/1M tokens).
In conclusion, Llama 3.1 405B Instruct is more expensive than Devstral Medium.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Both models have the same input context window of 128,000 tokens. Both models can generate responses up to 128,000 tokens.
License
Usage and distribution terms
Devstral Medium is licensed under a proprietary license, while Llama 3.1 405B Instruct uses Llama 3.1 Community License.
License differences may affect how you can use these models in commercial or open-source projects.
Proprietary
Closed source
Llama 3.1 Community License
Open weights
Release Timeline
When each model was launched
Devstral Medium was released on 2025-07-10, while Llama 3.1 405B Instruct was released on 2024-07-23.
Devstral Medium is 12 months newer than Llama 3.1 405B Instruct.
Jul 10, 2025
1.2 years ago
11mo newerJul 23, 2024
2.1 years ago
Knowledge Cutoff
When training data ends
Neither model specifies a knowledge cutoff date.
Unable to compare the recency of their training data.
Provider Availability
Devstral Medium is available from Mistral AI. Llama 3.1 405B Instruct is available from Lambda, DeepInfra, Fireworks, Bedrock, Together, Hyperbolic, Google, Replicate.
Devstral Medium
Llama 3.1 405B Instruct
Outputs Comparison
Judge for yourself.
Run your own prompts against Devstral Medium and Llama 3.1 405B Instruct side-by-side, then vote on the output you prefer.
FAQ
Common questions about Devstral Medium vs Llama 3.1 405B Instruct.