GLM 5.3 vs GPT-5.5
As of Oct 14, 2026, GLM 5.3 leads GPT-5.5 in 3 of 6 shared categories: Reasoning, Science, and Coding › Web dev.
GLM 5.3
Yes. Yes on General LLM (open weights); Reasoning (best per dollar). Not the overall leader.
GPT-5.5
It used to be. Was SOTA in General LLM.
| Category | GLM 5.3 | GPT-5.5 |
|---|---|---|
| General LLM | #23 · #23 in General LLM Margin 15.646258503401356 LMArena leaderboard dataset · Oct 13, 2026 | #21 · Was SOTA · General LLM Margin 14.285714285714292 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #19 · #19 in Reasoning Margin 13.698630136986296 LMArena leaderboard dataset · Oct 13, 2026 | #25 · #25 in Reasoning Margin 17.808219178082197 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 | #28 · #28 in Science Margin — Epoch AI benchmarking hub · Aug 14, 2026 | #30 · #30 in Science Margin — Epoch AI benchmarking hub · Apr 23, 2026 |
| Coding | #7 · #7 in Coding Margin 36.36363636363637 Terminal-Bench Harbor Hub · Oct 6, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Coding › Agentic | #7 · #7 in Coding › Agentic Margin 36.36363636363637 Terminal-Bench Harbor Hub · Oct 6, 2026 | — |
| Coding › Web dev | #18 · #18 in Coding › Web dev Margin 15.887850467289724 LMArena leaderboard dataset · Oct 13, 2026 | #44 · #44 in Coding › Web dev Margin 40.18691588785047 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #27 · #27 in Long context Margin 18.367346938775512 LMArena leaderboard dataset · Oct 13, 2026 | #23 · Was SOTA · Long context Margin 15.646258503401356 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | — | #10 · Was SOTA · Vision Margin 28.94736842105263 Epoch AI benchmarking hub · Apr 23, 2026 |
| Factuality | #27 · #27 in Factuality Margin 20.895522388059703 LMArena leaderboard dataset · Oct 13, 2026 | #5 · Was SOTA · Factuality Margin 4.477611940298502 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | — | #7 · #7 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Apr 23, 2026 |
GLM 5.3: $1.2592499999999998 per 1M blended tokens.
GPT-5.5: $11.25 per 1M blended tokens.
GLM 5.3: open weights.
GPT-5.5: closed weights.
General LLM: As of Oct 14, 2026, GPT-5.5 leads GLM 5.3 in General LLM at #21 against #23.
Reasoning: As of Oct 14, 2026, GLM 5.3 leads GPT-5.5 in Reasoning at #19 against #25.
Science: As of Oct 14, 2026, GLM 5.3 leads GPT-5.5 in Science at #28 against #30.
Coding › Web dev: As of Oct 14, 2026, GLM 5.3 leads GPT-5.5 in Coding › Web dev at #18 against #44.
Long context: As of Oct 14, 2026, GPT-5.5 leads GLM 5.3 in Long context at #23 against #27.
Factuality: As of Oct 14, 2026, GPT-5.5 leads GLM 5.3 in Factuality at #5 against #27.
GLM 5.3 or GPT-5.5?
As of Oct 14, 2026, GLM 5.3 leads GPT-5.5 in 3 of 6 shared categories: Reasoning, Science, and Coding › Web dev.
GLM 5.3 or GPT-5.5 for General LLM?
As of Oct 14, 2026, GPT-5.5 leads GLM 5.3 in General LLM at #21 against #23.
GLM 5.3 or GPT-5.5 for Reasoning?
As of Oct 14, 2026, GLM 5.3 leads GPT-5.5 in Reasoning at #19 against #25.
GLM 5.3 or GPT-5.5 for Science?
As of Oct 14, 2026, GLM 5.3 leads GPT-5.5 in Science at #28 against #30.