Claude Opus 5.5 vs Grok 4.5
As of Oct 15, 2026, Claude Opus 5.5 leads Grok 4.5 in 9 of 10 shared categories: General LLM, Reasoning, Coding, Coding › Agentic, Coding › Web dev, Long context, Vision, Factuality, and Abstraction (ARC).
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.
Grok 4.5
#14 Best recorded rank: #14 in Science, as of Oct 15, 2026.
| Category | Claude Opus 5.5 | Grok 4.5 |
|---|---|---|
| General LLM | #2 · Near-SOTA · General LLM Margin 1.0638297872340416 LMArena leaderboard dataset · Oct 13, 2026 | #45 · #45 in General LLM Margin 23.93617021276596 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #1 · Co-SOTA · Reasoning Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #44 · #44 in Reasoning Margin 23.93617021276596 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Science | #31 · #31 in Science Margin — Epoch AI benchmarking hub · Sep 22, 2026 | #14 · #14 in Science Margin — Epoch AI benchmarking hub · Jul 8, 2026 |
| Coding | #1 · Co-SOTA · Coding Margin 0 Terminal-Bench Harbor Hub · Oct 6, 2026 | #19 · #19 in Coding Margin 95.45454545454545 Terminal-Bench Harbor Hub · Oct 6, 2026 |
| Coding › Agentic | #1 · Co-SOTA · Coding › Agentic Margin 0 Terminal-Bench Harbor Hub · Oct 6, 2026 | #19 · #19 in Coding › Agentic Margin 95.45454545454545 Terminal-Bench Harbor Hub · Oct 6, 2026 |
| Coding › Web dev | #1 · SOTA · Coding › Web dev Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #36 · #36 in Coding › Web dev Margin 28 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #1 · Co-SOTA · Long context Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #41 · #41 in Long context Margin 21.808510638297875 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #4 · Near-SOTA · Vision Margin 13.15789473684211 Epoch AI benchmarking hub · Sep 22, 2026 | #29 · #29 in Vision Margin 86.84210526315789 Epoch AI benchmarking hub · Jul 8, 2026 |
| Factuality | #1 · Co-SOTA · Factuality Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #30 · #30 in Factuality Margin 18.023255813953483 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #1 · #1 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Sep 22, 2026 | #21 · #21 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Jul 8, 2026 |
Claude Opus 5.5: $8.000000000000002 per 1M blended tokens.
Grok 4.5: $3 per 1M blended tokens.
Claude Opus 5.5: closed weights.
Grok 4.5: closed weights.
General LLM: As of Oct 15, 2026, Claude Opus 5.5 leads Grok 4.5 in General LLM at #2 against #45.
Reasoning: As of Oct 15, 2026, Claude Opus 5.5 leads Grok 4.5 in Reasoning at #1 against #44.
Science: As of Oct 15, 2026, Grok 4.5 leads Claude Opus 5.5 in Science at #14 against #31.
Coding: As of Oct 15, 2026, Claude Opus 5.5 leads Grok 4.5 in Coding at #1 against #19.
Coding › Agentic: As of Oct 15, 2026, Claude Opus 5.5 leads Grok 4.5 in Coding › Agentic at #1 against #19.
Coding › Web dev: As of Oct 15, 2026, Claude Opus 5.5 leads Grok 4.5 in Coding › Web dev at #1 against #36.
Long context: As of Oct 15, 2026, Claude Opus 5.5 leads Grok 4.5 in Long context at #1 against #41.
Vision: As of Oct 15, 2026, Claude Opus 5.5 leads Grok 4.5 in Vision at #4 against #29.
Factuality: As of Oct 15, 2026, Claude Opus 5.5 leads Grok 4.5 in Factuality at #1 against #30.
Abstraction (ARC): As of Oct 15, 2026, Claude Opus 5.5 leads Grok 4.5 in Abstraction (ARC) at #1 against #21.
Claude Opus 5.5 or Grok 4.5?
As of Oct 15, 2026, Claude Opus 5.5 leads Grok 4.5 in 9 of 10 shared categories: General LLM, Reasoning, Coding, Coding › Agentic, Coding › Web dev, Long context, Vision, Factuality, and Abstraction (ARC).
Claude Opus 5.5 or Grok 4.5 for General LLM?
As of Oct 15, 2026, Claude Opus 5.5 leads Grok 4.5 in General LLM at #2 against #45.
Claude Opus 5.5 or Grok 4.5 for Reasoning?
As of Oct 15, 2026, Claude Opus 5.5 leads Grok 4.5 in Reasoning at #1 against #44.
Claude Opus 5.5 or Grok 4.5 for Science?
As of Oct 15, 2026, Grok 4.5 leads Claude Opus 5.5 in Science at #14 against #31.