Claude Opus 5.5 vs GLM 5.3
As of Oct 14, 2026, Claude Opus 5.5 leads GLM 5.3 in 7 of 8 shared categories: General LLM, Reasoning, Coding, Coding › Agentic, Coding › Web dev, Long context, and Factuality.
Claude Opus 5.5
Yes. SOTA in co-SOTA in Reasoning, co-SOTA in Coding, co-SOTA in Coding › Agentic, Coding › Web dev, co-SOTA in Long context and co-SOTA in Factuality.
GLM 5.3
Yes. Yes on General LLM (open weights); Reasoning (best per dollar). Not the overall leader.
| Category | Claude Opus 5.5 | GLM 5.3 |
|---|---|---|
| General LLM | #2 · Near-SOTA · General LLM Margin 1.3605442176870781 LMArena leaderboard dataset · Oct 13, 2026 | #23 · #23 in General LLM Margin 15.646258503401356 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #1 · Co-SOTA · Reasoning Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #19 · #19 in Reasoning Margin 13.698630136986296 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 | #31 · #31 in Science Margin — Epoch AI benchmarking hub · Sep 22, 2026 | #28 · #28 in Science Margin — Epoch AI benchmarking hub · Aug 14, 2026 |
| Coding | #1 · Co-SOTA · Coding Margin 0 Terminal-Bench Harbor Hub · Oct 6, 2026 | #7 · #7 in Coding Margin 36.36363636363637 Terminal-Bench Harbor Hub · Oct 6, 2026 |
| Coding › Agentic | #1 · Co-SOTA · Coding › Agentic Margin 0 Terminal-Bench Harbor Hub · Oct 6, 2026 | #7 · #7 in Coding › Agentic Margin 36.36363636363637 Terminal-Bench Harbor Hub · Oct 6, 2026 |
| Coding › Web dev | #1 · SOTA · Coding › Web dev Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #18 · #18 in Coding › Web dev Margin 15.887850467289724 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #1 · Co-SOTA · Long context Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #27 · #27 in Long context Margin 18.367346938775512 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #4 · Near-SOTA · Vision Margin 13.15789473684211 Epoch AI benchmarking hub · Sep 22, 2026 | — |
| Factuality | #1 · Co-SOTA · Factuality Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #27 · #27 in Factuality Margin 20.895522388059703 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #1 · #1 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Sep 22, 2026 | — |
Claude Opus 5.5: $8.000000000000002 per 1M blended tokens.
GLM 5.3: $1.2592499999999998 per 1M blended tokens.
Claude Opus 5.5: closed weights.
GLM 5.3: open weights.
General LLM: As of Oct 14, 2026, Claude Opus 5.5 leads GLM 5.3 in General LLM at #2 against #23.
Reasoning: As of Oct 14, 2026, Claude Opus 5.5 leads GLM 5.3 in Reasoning at #1 against #19.
Science: As of Oct 14, 2026, GLM 5.3 leads Claude Opus 5.5 in Science at #28 against #31.
Coding: As of Oct 14, 2026, Claude Opus 5.5 leads GLM 5.3 in Coding at #1 against #7.
Coding › Agentic: As of Oct 14, 2026, Claude Opus 5.5 leads GLM 5.3 in Coding › Agentic at #1 against #7.
Coding › Web dev: As of Oct 14, 2026, Claude Opus 5.5 leads GLM 5.3 in Coding › Web dev at #1 against #18.
Long context: As of Oct 14, 2026, Claude Opus 5.5 leads GLM 5.3 in Long context at #1 against #27.
Factuality: As of Oct 14, 2026, Claude Opus 5.5 leads GLM 5.3 in Factuality at #1 against #27.
Claude Opus 5.5 or GLM 5.3?
As of Oct 14, 2026, Claude Opus 5.5 leads GLM 5.3 in 7 of 8 shared categories: General LLM, Reasoning, Coding, Coding › Agentic, Coding › Web dev, Long context, and Factuality.
Claude Opus 5.5 or GLM 5.3 for General LLM?
As of Oct 14, 2026, Claude Opus 5.5 leads GLM 5.3 in General LLM at #2 against #23.
Claude Opus 5.5 or GLM 5.3 for Reasoning?
As of Oct 14, 2026, Claude Opus 5.5 leads GLM 5.3 in Reasoning at #1 against #19.
Claude Opus 5.5 or GLM 5.3 for Science?
As of Oct 14, 2026, GLM 5.3 leads Claude Opus 5.5 in Science at #28 against #31.