GPT-5.5 vs Kimi K2 5 Instant
As of Oct 14, 2026, GPT-5.5 leads Kimi K2 5 Instant 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 Instant
#71 Best current rank: #71 in Reasoning, as of Oct 14, 2026.
| Category | GPT-5.5 | Kimi K2 5 Instant |
|---|---|---|
| General LLM | #21 · Was SOTA · General LLM Margin 14.285714285714292 LMArena leaderboard dataset · Oct 13, 2026 | #80 · #80 in General LLM Margin 54.42176870748299 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #25 · #25 in Reasoning Margin 17.808219178082197 LMArena leaderboard dataset · Oct 13, 2026 | #71 · #71 in Reasoning Margin 49.31506849315068 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 | #71 · #71 in Coding › Web dev Margin 65.42056074766356 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #23 · Was SOTA · Long context Margin 15.646258503401356 LMArena leaderboard dataset · Oct 13, 2026 | #78 · #78 in Long context Margin 53.06122448979592 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 | #85 · #85 in Factuality Margin 64.17910447761194 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 Instant: price per 1M tokens is unset in the catalog.
GPT-5.5: closed weights.
Kimi K2 5 Instant: open weights.
General LLM: As of Oct 14, 2026, GPT-5.5 leads Kimi K2 5 Instant in General LLM at #21 against #80.
Reasoning: As of Oct 14, 2026, GPT-5.5 leads Kimi K2 5 Instant in Reasoning at #25 against #71.
Coding › Web dev: As of Oct 14, 2026, GPT-5.5 leads Kimi K2 5 Instant in Coding › Web dev at #44 against #71.
Long context: As of Oct 14, 2026, GPT-5.5 leads Kimi K2 5 Instant in Long context at #23 against #78.
Factuality: As of Oct 14, 2026, GPT-5.5 leads Kimi K2 5 Instant in Factuality at #5 against #85.
GPT-5.5 or Kimi K2 5 Instant?
As of Oct 14, 2026, GPT-5.5 leads Kimi K2 5 Instant in 5 of 5 shared categories: General LLM, Reasoning, Coding › Web dev, Long context, and Factuality.
GPT-5.5 or Kimi K2 5 Instant for General LLM?
As of Oct 14, 2026, GPT-5.5 leads Kimi K2 5 Instant in General LLM at #21 against #80.
GPT-5.5 or Kimi K2 5 Instant for Reasoning?
As of Oct 14, 2026, GPT-5.5 leads Kimi K2 5 Instant in Reasoning at #25 against #71.
GPT-5.5 or Kimi K2 5 Instant for Coding › Web dev?
As of Oct 14, 2026, GPT-5.5 leads Kimi K2 5 Instant in Coding › Web dev at #44 against #71.