Claude Opus 5.5 vs Llama 3.1 405B Instruct
As of Oct 14, 2026, Claude Opus 5.5 leads Llama 3.1 405B Instruct in 2 of 2 shared categories: General LLM and Science.
Claude Opus 5.5
Yes. SOTA in co-SOTA in Reasoning, co-SOTA in Coding, co-SOTA in Coding › Agentic, Coding › Web dev, co-SOTA in Long context and co-SOTA in Factuality.
Llama 3.1 405B Instruct
It used to be. Was SOTA in General LLM.
| Category | Claude Opus 5.5 | Llama 3.1 405B Instruct |
|---|---|---|
| General LLM | #2 · Near-SOTA · General LLM Margin 1.3605442176870781 LMArena leaderboard dataset · Oct 13, 2026 | #3 · #3 in General LLM Margin — LMArena leaderboard dataset · Sep 4, 2024 |
| Reasoning | #1 · Co-SOTA · Reasoning Margin 0 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 | #31 · #31 in Science Margin — Epoch AI benchmarking hub · Sep 22, 2026 | #124 · #124 in Science Margin — Epoch AI benchmarking hub · Jul 23, 2024 |
| Coding | #1 · Co-SOTA · Coding Margin 0 Terminal-Bench Harbor Hub · Oct 6, 2026 | — |
| Coding › Agentic | #1 · Co-SOTA · Coding › Agentic Margin 0 Terminal-Bench Harbor Hub · Oct 6, 2026 | — |
| Coding › Web dev | #1 · SOTA · Coding › Web dev Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | — |
| Long context | #1 · Co-SOTA · Long context Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | — |
| Vision | #4 · Near-SOTA · Vision Margin 13.15789473684211 Epoch AI benchmarking hub · Sep 22, 2026 | — |
| Factuality | #1 · Co-SOTA · Factuality Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | — |
| Abstraction (ARC) | #1 · #1 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Sep 22, 2026 | — |
Claude Opus 5.5: $8.000000000000002 per 1M blended tokens.
Llama 3.1 405B Instruct: price per 1M tokens is unset in the catalog.
Claude Opus 5.5: closed weights.
Llama 3.1 405B Instruct: open weights.
General LLM: As of Oct 14, 2026, Claude Opus 5.5 leads Llama 3.1 405B Instruct in General LLM at #2 against #3.
Science: As of Oct 14, 2026, Claude Opus 5.5 leads Llama 3.1 405B Instruct in Science at #31 against #124.
Claude Opus 5.5 · Llama 3.1 405B Instruct
Claude Opus 5.5 or Llama 3.1 405B Instruct?
As of Oct 14, 2026, Claude Opus 5.5 leads Llama 3.1 405B Instruct in 2 of 2 shared categories: General LLM and Science.
Claude Opus 5.5 or Llama 3.1 405B Instruct for General LLM?
As of Oct 14, 2026, Claude Opus 5.5 leads Llama 3.1 405B Instruct in General LLM at #2 against #3.
Claude Opus 5.5 or Llama 3.1 405B Instruct for Science?
As of Oct 14, 2026, Claude Opus 5.5 leads Llama 3.1 405B Instruct in Science at #31 against #124.