Claude Opus 4.5 vs Llama 3.1 405B Instruct
As of Oct 15, 2026, Claude Opus 4.5 leads Llama 3.1 405B Instruct in 1 of 2 shared categories: Science.
Claude Opus 4.5
It used to be. Was SOTA in Reasoning.
Llama 3.1 405B Instruct
It used to be. Was SOTA in General LLM.
| Category | Claude Opus 4.5 | Llama 3.1 405B Instruct |
|---|---|---|
| General LLM | #41 · #41 in General LLM Margin 21.808510638297875 LMArena leaderboard dataset · Oct 13, 2026 | #5 · #5 in General LLM Margin — LMArena leaderboard dataset · Sep 4, 2024 |
| Reasoning | #30 · Was SOTA · Reasoning Margin 16.489361702127653 LMArena leaderboard dataset · Oct 13, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Sep 4, 2024 |
| Math | #16 · #16 in Math Margin 33.33333333333333 Epoch AI benchmarking hub · Nov 24, 2025 | — |
| Science | #68 · #68 in Science Margin — Epoch AI benchmarking hub · Nov 24, 2025 | #124 · #124 in Science Margin — Epoch AI benchmarking hub · Jul 23, 2024 |
| Coding | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 | — |
| Coding › Web dev | #58 · Was SOTA · Coding › Web dev Margin 45.6 LMArena leaderboard dataset · Oct 13, 2026 | — |
| Long context | #20 · Was SOTA · Long context Margin 10.63829787234043 LMArena leaderboard dataset · Oct 13, 2026 | — |
| Factuality | #40 · #40 in Factuality Margin 23.837209302325576 LMArena leaderboard dataset · Oct 13, 2026 | — |
| Abstraction (ARC) | #49 · #49 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Nov 24, 2025 | — |
Claude Opus 4.5: $10 per 1M blended tokens.
Llama 3.1 405B Instruct: price per 1M tokens is unset in the catalog.
Claude Opus 4.5: closed weights.
Llama 3.1 405B Instruct: open weights.
General LLM: As of Oct 15, 2026, Llama 3.1 405B Instruct leads Claude Opus 4.5 in General LLM at #5 against #41.
Science: As of Oct 15, 2026, Claude Opus 4.5 leads Llama 3.1 405B Instruct in Science at #68 against #124.
Claude Opus 4.5 · Llama 3.1 405B Instruct
Claude Opus 4.5 or Llama 3.1 405B Instruct?
As of Oct 15, 2026, Claude Opus 4.5 leads Llama 3.1 405B Instruct in 1 of 2 shared categories: Science.
Claude Opus 4.5 or Llama 3.1 405B Instruct for General LLM?
As of Oct 15, 2026, Llama 3.1 405B Instruct leads Claude Opus 4.5 in General LLM at #5 against #41.
Claude Opus 4.5 or Llama 3.1 405B Instruct for Science?
As of Oct 15, 2026, Claude Opus 4.5 leads Llama 3.1 405B Instruct in Science at #68 against #124.