GPT-5.5 vs Kimi K2 5 Thinking
As of Oct 14, 2026, GPT-5.5 leads Kimi K2 5 Thinking in 5 of 5 shared categories: General LLM, Reasoning, Coding › Web dev, Long context, and Factuality.
GPT-5.5
It used to be. Was SOTA in General LLM.
Kimi K2 5 Thinking
It used to be. Was SOTA in Coding › Web dev.
| Category | GPT-5.5 | Kimi K2 5 Thinking |
|---|---|---|
| General LLM | #21 · Was SOTA · General LLM Margin 14.285714285714292 LMArena leaderboard dataset · Oct 13, 2026 | #56 · #56 in General LLM Margin 38.095238095238095 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #25 · #25 in Reasoning Margin 17.808219178082197 LMArena leaderboard dataset · Oct 13, 2026 | #58 · #58 in Reasoning Margin 40.41095890410959 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 | — |
| Coding | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Coding › Web dev | #44 · #44 in Coding › Web dev Margin 40.18691588785047 LMArena leaderboard dataset · Oct 13, 2026 | #61 · #61 in Coding › Web dev Margin 56.074766355140184 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #23 · Was SOTA · Long context Margin 15.646258503401356 LMArena leaderboard dataset · Oct 13, 2026 | #57 · #57 in Long context Margin 38.775510204081634 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #10 · Was SOTA · Vision Margin 28.94736842105263 Epoch AI benchmarking hub · Apr 23, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 9, 2026 |
| Factuality | #5 · Was SOTA · Factuality Margin 4.477611940298502 LMArena leaderboard dataset · Oct 13, 2026 | #58 · #58 in Factuality Margin 44.02985074626866 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #7 · #7 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Apr 23, 2026 | — |
GPT-5.5: $11.25 per 1M blended tokens.
Kimi K2 5 Thinking: price per 1M tokens is unset in the catalog.
GPT-5.5: closed weights.
Kimi K2 5 Thinking: open weights.
General LLM: As of Oct 14, 2026, GPT-5.5 leads Kimi K2 5 Thinking in General LLM at #21 against #56.
Reasoning: As of Oct 14, 2026, GPT-5.5 leads Kimi K2 5 Thinking in Reasoning at #25 against #58.
Coding › Web dev: As of Oct 14, 2026, GPT-5.5 leads Kimi K2 5 Thinking in Coding › Web dev at #44 against #61.
Long context: As of Oct 14, 2026, GPT-5.5 leads Kimi K2 5 Thinking in Long context at #23 against #57.
Factuality: As of Oct 14, 2026, GPT-5.5 leads Kimi K2 5 Thinking in Factuality at #5 against #58.
GPT-5.5 or Kimi K2 5 Thinking?
As of Oct 14, 2026, GPT-5.5 leads Kimi K2 5 Thinking in 5 of 5 shared categories: General LLM, Reasoning, Coding › Web dev, Long context, and Factuality.
GPT-5.5 or Kimi K2 5 Thinking for General LLM?
As of Oct 14, 2026, GPT-5.5 leads Kimi K2 5 Thinking in General LLM at #21 against #56.
GPT-5.5 or Kimi K2 5 Thinking for Reasoning?
As of Oct 14, 2026, GPT-5.5 leads Kimi K2 5 Thinking in Reasoning at #25 against #58.
GPT-5.5 or Kimi K2 5 Thinking for Coding › Web dev?
As of Oct 14, 2026, GPT-5.5 leads Kimi K2 5 Thinking in Coding › Web dev at #44 against #61.