Model comparison
Llama 3.1 405B vs o3
Capability radar, value bars, and side-by-side posture.
Llama 3.1 405B
Not scored
value score
o3
93
value score
Llama 3.1 405B ctx
128K
o3 ctx
200K
Capability radar
Value · context · multimodal · openness · speed posture
Value head-to-head
- o393
Attribute tape
| Field | Llama 3.1 405B | o3 |
|---|---|---|
| Developer | meta-llama | OpenAI |
| Context | 128K | 200K |
| Modalities | Text, Code | |
| Openness | Open Weights | Proprietary Model |
| Speed | — | — |
| Price | — | $10/1M in · $40/1M out |
| Value score | — | 93 |
| Summary | Llama 3.1 405B is Meta's flagship open-weight large language model with 405 billion parameters and a 128k-token context window, designed for multilingual dialogue, reasoning, math, coding, and tool use. It is the largest model in the Llama 3.1 family and was positioned by Meta as the first openly available model competitive with top proprietary AI models on general-knowledge and instruction-following benchmarks. | OpenAI reasoning model focused on hard problems. |