Claude Opus 5 vs Llama 3.1 405B Instruct
As of Oct 15, 2026, Claude Opus 5 leads Llama 3.1 405B Instruct in 1 of 2 shared categories: Science.
Claude Opus 5
Close. Near-SOTA in Factuality, rank #4.
Llama 3.1 405B Instruct
It used to be. Was SOTA in General LLM.
| Category | Claude Opus 5 | Llama 3.1 405B Instruct |
|---|---|---|
| General LLM | #11 · Was SOTA · General LLM Margin 5.851063829787236 LMArena leaderboard dataset · Oct 13, 2026 | #5 · #5 in General LLM Margin — LMArena leaderboard dataset · Sep 4, 2024 |
| Reasoning | #9 · Was SOTA · Reasoning Margin 5.319148936170208 LMArena leaderboard dataset · Oct 13, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Sep 4, 2024 |
| Math | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 | — |
| Science | #12 · #12 in Science Margin — Epoch AI benchmarking hub · Jul 24, 2026 | #124 · #124 in Science Margin — Epoch AI benchmarking hub · Jul 23, 2024 |
| Coding | #4 · #4 in Coding Margin 22.727272727272734 Terminal-Bench Harbor Hub · Oct 6, 2026 | — |
| Coding › Agentic | #4 · #4 in Coding › Agentic Margin 22.727272727272734 Terminal-Bench Harbor Hub · Oct 6, 2026 | — |
| Coding › Web dev | #6 · Near-SOTA · Coding › Web dev Margin 4 LMArena leaderboard dataset · Oct 13, 2026 | — |
| Long context | #9 · Was SOTA · Long context Margin 4.7872340425531945 LMArena leaderboard dataset · Oct 13, 2026 | — |
| Vision | #12 · #12 in Vision Margin 36.8421052631579 Epoch AI benchmarking hub · Jul 24, 2026 | — |
| Factuality | #4 · Near-SOTA · Factuality Margin 2.9069767441860535 LMArena leaderboard dataset · Oct 13, 2026 | — |
| Abstraction (ARC) | #3 · #3 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Jul 24, 2026 | — |
Claude Opus 5: $10 per 1M blended tokens.
Llama 3.1 405B Instruct: price per 1M tokens is unset in the catalog.
Claude Opus 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 5 in General LLM at #5 against #11.
Science: As of Oct 15, 2026, Claude Opus 5 leads Llama 3.1 405B Instruct in Science at #12 against #124.
Claude Opus 5 · Llama 3.1 405B Instruct
Claude Opus 5 or Llama 3.1 405B Instruct?
As of Oct 15, 2026, Claude Opus 5 leads Llama 3.1 405B Instruct in 1 of 2 shared categories: Science.
Claude Opus 5 or Llama 3.1 405B Instruct for General LLM?
As of Oct 15, 2026, Llama 3.1 405B Instruct leads Claude Opus 5 in General LLM at #5 against #11.
Claude Opus 5 or Llama 3.1 405B Instruct for Science?
As of Oct 15, 2026, Claude Opus 5 leads Llama 3.1 405B Instruct in Science at #12 against #124.