Claude Opus 5.5 vs Grok 4.3
As of Oct 15, 2026, Claude Opus 5.5 leads Grok 4.3 in 7 of 7 shared categories: General LLM, Reasoning, Science, Coding › Web dev, Long context, Vision, and Factuality.
Claude Opus 5.5
Yes. SOTA in Reasoning (tied), Coding (tied), Coding › Agentic (tied), Coding › Web dev, Long context (tied), and Factuality (tied).
Grok 4.3
#32 Best current rank: #32 in Vision, as of Oct 15, 2026.
| Category | Claude Opus 5.5 | Grok 4.3 |
|---|---|---|
| General LLM | #2 · Near-SOTA · General LLM Margin 1.0638297872340416 LMArena leaderboard dataset · Oct 13, 2026 | #85 · #85 in General LLM Margin 45.212765957446805 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #1 · Co-SOTA · Reasoning Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #96 · #96 in Reasoning Margin 51.59574468085106 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 | #41 · #41 in Science Margin — Epoch AI benchmarking hub · Apr 17, 2026 |
| Coding | #1 · Co-SOTA · Coding Margin 0 Terminal-Bench Harbor Hub · Oct 6, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 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 | #95 · #95 in Coding › Web dev Margin 75.2 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #1 · Co-SOTA · Long context Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #94 · #94 in Long context Margin 50 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #4 · Near-SOTA · Vision Margin 13.15789473684211 Epoch AI benchmarking hub · Sep 22, 2026 | #32 · #32 in Vision Margin 97.36842105263158 Epoch AI benchmarking hub · Apr 17, 2026 |
| Factuality | #1 · Co-SOTA · Factuality Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #111 · #111 in Factuality Margin 65.11627906976744 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.
Grok 4.3: $1.5625000000000002 per 1M blended tokens.
Claude Opus 5.5: closed weights.
Grok 4.3: closed weights.
General LLM: As of Oct 15, 2026, Claude Opus 5.5 leads Grok 4.3 in General LLM at #2 against #85.
Reasoning: As of Oct 15, 2026, Claude Opus 5.5 leads Grok 4.3 in Reasoning at #1 against #96.
Science: As of Oct 15, 2026, Claude Opus 5.5 leads Grok 4.3 in Science at #31 against #41.
Coding › Web dev: As of Oct 15, 2026, Claude Opus 5.5 leads Grok 4.3 in Coding › Web dev at #1 against #95.
Long context: As of Oct 15, 2026, Claude Opus 5.5 leads Grok 4.3 in Long context at #1 against #94.
Vision: As of Oct 15, 2026, Claude Opus 5.5 leads Grok 4.3 in Vision at #4 against #32.
Factuality: As of Oct 15, 2026, Claude Opus 5.5 leads Grok 4.3 in Factuality at #1 against #111.
Claude Opus 5.5 or Grok 4.3?
As of Oct 15, 2026, Claude Opus 5.5 leads Grok 4.3 in 7 of 7 shared categories: General LLM, Reasoning, Science, Coding › Web dev, Long context, Vision, and Factuality.
Claude Opus 5.5 or Grok 4.3 for General LLM?
As of Oct 15, 2026, Claude Opus 5.5 leads Grok 4.3 in General LLM at #2 against #85.
Claude Opus 5.5 or Grok 4.3 for Reasoning?
As of Oct 15, 2026, Claude Opus 5.5 leads Grok 4.3 in Reasoning at #1 against #96.
Claude Opus 5.5 or Grok 4.3 for Science?
As of Oct 15, 2026, Claude Opus 5.5 leads Grok 4.3 in Science at #31 against #41.