Llama 3.1 405B Instruct vs O3
As of Oct 14, 2026, Llama 3.1 405B Instruct leads O3 in 1 of 2 shared categories: General LLM.
Llama 3.1 405B Instruct
It used to be. Was SOTA in General LLM.
O3
It used to be. Was SOTA in General LLM.
| Category | Llama 3.1 405B Instruct | O3 |
|---|---|---|
| General LLM | #3 · #3 in General LLM Margin — LMArena leaderboard dataset · Sep 4, 2024 | #78 · Was SOTA · General LLM Margin 53.06122448979592 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #— · Not enough data Margin — LMArena leaderboard dataset · Sep 4, 2024 | #90 · Was SOTA · Reasoning Margin 62.32876712328767 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | — | #20 · Was SOTA · Math Margin 42.22222222222222 Epoch AI benchmarking hub · Apr 16, 2025 |
| Science | #124 · #124 in Science Margin — Epoch AI benchmarking hub · Jul 23, 2024 | #67 · #67 in Science Margin — Epoch AI benchmarking hub · Apr 16, 2025 |
| Coding | — | #— · Not enough data Margin — Epoch AI benchmarking hub · Apr 16, 2025 |
| Long context | — | #110 · Was SOTA · Long context Margin 74.82993197278913 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | — | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 9, 2026 |
| Factuality | — | #105 · #105 in Factuality Margin 79.1044776119403 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | — | #37 · #37 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Apr 16, 2025 |
Llama 3.1 405B Instruct: price per 1M tokens is unset in the catalog.
O3: $3.5 per 1M blended tokens.
Llama 3.1 405B Instruct: open weights.
O3: closed weights.
General LLM: As of Oct 14, 2026, Llama 3.1 405B Instruct leads O3 in General LLM at #3 against #78.
Science: As of Oct 14, 2026, O3 leads Llama 3.1 405B Instruct in Science at #67 against #124.
Llama 3.1 405B Instruct or O3?
As of Oct 14, 2026, Llama 3.1 405B Instruct leads O3 in 1 of 2 shared categories: General LLM.
Llama 3.1 405B Instruct or O3 for General LLM?
As of Oct 14, 2026, Llama 3.1 405B Instruct leads O3 in General LLM at #3 against #78.
Llama 3.1 405B Instruct or O3 for Science?
As of Oct 14, 2026, O3 leads Llama 3.1 405B Instruct in Science at #67 against #124.