GPT-5.5 vs Grok 4.5
As of Oct 14, 2026, GPT-5.5 leads Grok 4.5 in 6 of 8 shared categories: General LLM, Reasoning, Long context, Vision, Factuality, and Abstraction (ARC).
GPT-5.5
It used to be. Was SOTA in General LLM.
Grok 4.5
#14 Best recorded rank: #14 in Science, as of Oct 14, 2026.
| Category | GPT-5.5 | Grok 4.5 |
|---|---|---|
| General LLM | #21 · Was SOTA · General LLM Margin 14.285714285714292 LMArena leaderboard dataset · Oct 13, 2026 | #36 · #36 in General LLM Margin 24.48979591836735 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #25 · #25 in Reasoning Margin 17.808219178082197 LMArena leaderboard dataset · Oct 13, 2026 | #37 · #37 in Reasoning Margin 26.027397260273972 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 | #30 · #30 in Science Margin — Epoch AI benchmarking hub · Apr 23, 2026 | #14 · #14 in Science Margin — Epoch AI benchmarking hub · Jul 8, 2026 |
| Coding | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 | #19 · #19 in Coding Margin 95.45454545454545 Terminal-Bench Harbor Hub · Oct 6, 2026 |
| Coding › Agentic | — | #19 · #19 in Coding › Agentic Margin 95.45454545454545 Terminal-Bench Harbor Hub · Oct 6, 2026 |
| Coding › Web dev | #44 · #44 in Coding › Web dev Margin 40.18691588785047 LMArena leaderboard dataset · Oct 13, 2026 | #34 · #34 in Coding › Web dev Margin 30.8411214953271 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #23 · Was SOTA · Long context Margin 15.646258503401356 LMArena leaderboard dataset · Oct 13, 2026 | #35 · #35 in Long context Margin 23.80952380952381 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #10 · Was SOTA · Vision Margin 28.94736842105263 Epoch AI benchmarking hub · Apr 23, 2026 | #29 · #29 in Vision Margin 86.84210526315789 Epoch AI benchmarking hub · Jul 8, 2026 |
| Factuality | #5 · Was SOTA · Factuality Margin 4.477611940298502 LMArena leaderboard dataset · Oct 13, 2026 | #26 · #26 in Factuality Margin 20.14925373134328 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #7 · #7 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Apr 23, 2026 | #21 · #21 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Jul 8, 2026 |
GPT-5.5: $11.25 per 1M blended tokens.
Grok 4.5: $3 per 1M blended tokens.
GPT-5.5: closed weights.
Grok 4.5: closed weights.
General LLM: As of Oct 14, 2026, GPT-5.5 leads Grok 4.5 in General LLM at #21 against #36.
Reasoning: As of Oct 14, 2026, GPT-5.5 leads Grok 4.5 in Reasoning at #25 against #37.
Science: As of Oct 14, 2026, Grok 4.5 leads GPT-5.5 in Science at #14 against #30.
Coding › Web dev: As of Oct 14, 2026, Grok 4.5 leads GPT-5.5 in Coding › Web dev at #34 against #44.
Long context: As of Oct 14, 2026, GPT-5.5 leads Grok 4.5 in Long context at #23 against #35.
Vision: As of Oct 14, 2026, GPT-5.5 leads Grok 4.5 in Vision at #10 against #29.
Factuality: As of Oct 14, 2026, GPT-5.5 leads Grok 4.5 in Factuality at #5 against #26.
Abstraction (ARC): As of Oct 14, 2026, GPT-5.5 leads Grok 4.5 in Abstraction (ARC) at #7 against #21.
GPT-5.5 or Grok 4.5?
As of Oct 14, 2026, GPT-5.5 leads Grok 4.5 in 6 of 8 shared categories: General LLM, Reasoning, Long context, Vision, Factuality, and Abstraction (ARC).
GPT-5.5 or Grok 4.5 for General LLM?
As of Oct 14, 2026, GPT-5.5 leads Grok 4.5 in General LLM at #21 against #36.
GPT-5.5 or Grok 4.5 for Reasoning?
As of Oct 14, 2026, GPT-5.5 leads Grok 4.5 in Reasoning at #25 against #37.
GPT-5.5 or Grok 4.5 for Science?
As of Oct 14, 2026, Grok 4.5 leads GPT-5.5 in Science at #14 against #30.