Looking for an honest Meta Llama 3.1 405B vs Meta Llama 4 Behemoth comparison in 2026? We scored both ai language models on the same six-dimension framework — performance, battery, display, camera, design and value — using identical methodology, so the numbers below are directly comparable. In our overall scoring the Meta Llama 4 Behemoth comes out ahead 62/100 to 81/100 — a 19-point gap. The widest gap is in design and build, where the Meta Llama 4 Behemoth pulls noticeably ahead.
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Meta Llama 4 Behemoth clearly outperforms the Meta Llama 3.1 405B in the ai language models category, especially in design, scoring 81 vs 62. If you want the better overall ai language models, Meta Llama 4 Behemoth is the recommended choice.
Scores are relative within the ai language modelscategory. Percentages show each dimension's weight in the overall score. A difference of less than 0.5 points is considered a tie.
✗ Cons
✓ Pros
Lower cost = better value. Free = open-source self-hosted.
| Metric | 3.1 405B | 4 Behemoth |
|---|---|---|
| Input (Prompt) | Free/1M | Free/1M |
| Output (Completion) | Free/1M | Free/1M |
| Open Source | ✓ Free | ✓ Free |
Context Window (tokens)
| Metric | 3.1 405B | 4 Behemoth |
|---|---|---|
| Max Output | 4,096 tok | ✓8,192 tok |
| Speed | ✓30 tok/s | 15 tok/s |
| Time to First Token | ✓1.5s | 2.0s |
| Languages | 8+ | ✓50+ |
Higher is better. Industry-standard AI evaluation benchmarks.
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| Feature | 3.1 405B | 4 Behemoth |
|---|---|---|
| Reasoning / Chain-of-Thought | ✕ | ✓ |
| Vision (Image Input) | ✕ | ✓ |
| Audio Input | ✕ | ✕ |
| Video Input | ✕ | ✕ |
| Image/Audio Output | ✕ | ✕ |
| Function Calling / Tools | ✓ | ✓ |
| JSON Mode | ✓ | ✓ |
| Real-time Web Access | ✕ | ✕ |
| Fine-tuning Support | ✓ | ✓ |
| Batch API | ✓ | ✕ |
| Streaming | ✓ | ✓ |
| Open Source | ✓ | ✓ |
| Field | 3.1 405B | 4 Behemoth |
|---|---|---|
| Provider | Meta | Meta |
| Parameters | 405B | 2000B |
| Knowledge Cutoff | 2023-12 | 2025-03 |
| License | Llama 3.1 Community | Open |
| Best For | open sourceself hostingfine tuningenterprise privacy | researchmultimodalopen sourcesciencemath |
Buy Meta Llama 3.1 405B if…
The Meta Llama 3.1 405B is worth considering if you prefer its specific design, ecosystem, or brand — though it scores lower overall in our comparison.
Buy Meta Llama 4 Behemoth if…
Buy the Meta Llama 4 Behemoth if you want the best performance in this comparison. It scores higher overall and is the recommended choice for most buyers.
Meta Llama 4 Behemoth clearly outperforms the Meta Llama 3.1 405B in the ai language models category, especially in design, scoring 81 vs 62. If you want the better overall ai language models, Meta Llama 4 Behemoth is the recommended choice.
No, Meta Llama 4 Behemoth scores higher (75 vs 75).
Check the latest prices using the buy links above.
The Meta Llama 3.1 405B is worth considering if you prefer its specific design, ecosystem, or brand — though it scores lower overall in our comparison.
Buy the Meta Llama 4 Behemoth if you want the best performance in this comparison. It scores higher overall and is the recommended choice for most buyers.
Reviewed by VersusMatrix Editorial Team
Last updated: April 25, 2026
Methodology: AI-powered analysis of technical specifications from manufacturer data. Scores are calculated by comparing products across multiple dimensions and normalized relative to the full category database. Our editorial process is independent and not influenced by affiliate partnerships.