GLM 5.3 vs O3 Mini
As of Oct 14, 2026, GLM 5.3 leads O3 Mini in 3 of 4 shared categories: Reasoning, Science, and Long context.
GLM 5.3
Yes. Yes on General LLM (open weights); Reasoning (best per dollar). Not the overall leader.
O3 Mini
It used to be. Was SOTA in Reasoning.
| Category | GLM 5.3 | O3 Mini |
|---|---|---|
| General LLM | #23 · #23 in General LLM Margin 15.646258503401356 LMArena leaderboard dataset · Oct 13, 2026 | #7 · #7 in General LLM Margin — LMArena leaderboard dataset · Apr 16, 2025 |
| Reasoning | #19 · #19 in Reasoning Margin 13.698630136986296 LMArena leaderboard dataset · Oct 13, 2026 | #133 · Was SOTA · Reasoning Margin 91.78082191780823 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 | #76 · #76 in Science Margin — Epoch AI benchmarking hub · Jan 31, 2025 |
| 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 | — |
| Long context | #27 · #27 in Long context Margin 18.367346938775512 LMArena leaderboard dataset · Oct 13, 2026 | #145 · #145 in Long context Margin 98.63945578231292 LMArena leaderboard dataset · Oct 13, 2026 |
| Factuality | #27 · #27 in Factuality Margin 20.895522388059703 LMArena leaderboard dataset · Oct 13, 2026 | #— · Not enough data Margin — Epoch AI benchmarking hub · Jan 31, 2025 |
| Abstraction (ARC) | — | #51 · #51 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Jan 31, 2025 |
GLM 5.3: $1.2592499999999998 per 1M blended tokens.
O3 Mini: $1.9250000000000003 per 1M blended tokens.
GLM 5.3: open weights.
O3 Mini: closed weights.
General LLM: As of Oct 14, 2026, O3 Mini leads GLM 5.3 in General LLM at #7 against #23.
Reasoning: As of Oct 14, 2026, GLM 5.3 leads O3 Mini in Reasoning at #19 against #133.
Science: As of Oct 14, 2026, GLM 5.3 leads O3 Mini in Science at #28 against #76.
Long context: As of Oct 14, 2026, GLM 5.3 leads O3 Mini in Long context at #27 against #145.
GLM 5.3 or O3 Mini?
As of Oct 14, 2026, GLM 5.3 leads O3 Mini in 3 of 4 shared categories: Reasoning, Science, and Long context.
GLM 5.3 or O3 Mini for General LLM?
As of Oct 14, 2026, O3 Mini leads GLM 5.3 in General LLM at #7 against #23.
GLM 5.3 or O3 Mini for Reasoning?
As of Oct 14, 2026, GLM 5.3 leads O3 Mini in Reasoning at #19 against #133.
GLM 5.3 or O3 Mini for Science?
As of Oct 14, 2026, GLM 5.3 leads O3 Mini in Science at #28 against #76.