Llama 3.1 405B Instruct vs Qwen3.8 Flash
Qwen3.8 Flash leads the LLM Stats Score 49.6 to 14.9. Qwen3.8 Flash is 3.9x cheaper per token.
Meta · Alibaba Cloud / Qwen Team · Updated for 2026
Which is better?
Qwen3.8 Flash leads the overall LLM Stats Score 49.6 to 14.9, ranking #16 overall.
In the 1 individual benchmarks reported for both models, Qwen3.8 Flash wins 1; this is a narrower head-to-head signal than the composite indexes.
On price, Qwen3.8 Flash is roughly 3.9x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Qwen3.8 Flash also accepts a larger context window (1,000,000 input tokens), making it the stronger choice for long documents and large codebases.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose Llama 3.1 405B Instruct
- you need open weights you can self-host or fine-tune
Choose Qwen3.8 Flash
- overall performance matters — it scores 49.6 and ranks #16 on LLM Stats
- your work emphasizes reasoning and coding — it leads those capability indexes
- you value its reported benchmark strengths — it wins 1 of 1 exact shared results
- cost matters — it's about 3.9x cheaper per token
- you process long inputs — it offers a 1,000,000 token context window
- you want the most recent training data — it shipped Aug 2026
At a glance
The differences that matter most.
Capability indexes
Additional strengths measured across groups of related public benchmarks
Individual benchmarks
18 reported for Llama 3.1 405B Instruct · 22 for Qwen3.8 Flash
Llama 3.1 405B Instruct outperforms in 0 benchmarks, while Qwen3.8 Flash is better at 1 benchmark (GPQA).
Qwen3.8 Flash significantly outperforms across most benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, Llama 3.1 405B Instruct ($0.89/1M tokens) is 5.9x more expensive than Qwen3.8 Flash ($0.15/1M tokens).
For output processing, Llama 3.1 405B Instruct ($0.89/1M tokens) is 1.9x more expensive than Qwen3.8 Flash ($0.47/1M tokens).
In conclusion, Llama 3.1 405B Instruct is more expensive than Qwen3.8 Flash.*
* Using a 3:1 ratio of input to output tokens
Model Size
Parameter count comparison
Llama 3.1 405B Instruct has 280.0B more parameters than Qwen3.8 Flash, making it 224.0% larger.
Context Window
Maximum input and output token capacity
Qwen3.8 Flash accepts 1,000,000 input tokens compared to Llama 3.1 405B Instruct's 128,000 tokens. Qwen3.8 Flash can generate longer responses up to 131,072 tokens, while Llama 3.1 405B Instruct is limited to 128,000 tokens.
Input capabilities
Documented input modalities across available providers
Qwen3.8 Flash supports multimodal inputs, whereas Llama 3.1 405B Instruct does not.
Qwen3.8 Flash can handle both text and other forms of data like images, making it suitable for multimodal applications.
Llama 3.1 405B Instruct
Qwen3.8 Flash
License
Usage and distribution terms
Llama 3.1 405B Instruct is licensed under Llama 3.1 Community License, while Qwen3.8 Flash uses a proprietary license.
License differences may affect how you can use these models in commercial or open-source projects.
Llama 3.1 Community License
Open weights
Proprietary
Closed source
Release Timeline
When each model was launched
Llama 3.1 405B Instruct was released on 2024-07-23, while Qwen3.8 Flash was released on 2026-08-26.
Qwen3.8 Flash is 25 months newer than Llama 3.1 405B Instruct.
Jul 23, 2024
2.1 years ago
Aug 26, 2026
4 days ago
2.1yr newerKnowledge Cutoff
When training data ends
Neither model specifies a knowledge cutoff date.
Unable to compare the recency of their training data.
Provider Availability
Llama 3.1 405B Instruct is available from Lambda, DeepInfra, Fireworks, Bedrock, Together, Hyperbolic, Google, Replicate. Qwen3.8 Flash is available from Novita.
Llama 3.1 405B Instruct
Qwen3.8 Flash
Outputs Comparison
Judge for yourself.
Run your own prompts against Llama 3.1 405B Instruct and Qwen3.8 Flash side-by-side, then vote on the output you prefer.
FAQ
Common questions about Llama 3.1 405B Instruct vs Qwen3.8 Flash.