Claude Opus 5.5 vs GLM 5.3 Flash
As of Oct 15, 2026, Claude Opus 5.5 leads GLM 5.3 Flash in 10 of 10 shared categories: General LLM, Reasoning, Science, Coding, Coding › Agentic, Coding › Web dev, Long context, Vision, Factuality, and Abstraction (ARC).
Claude Opus 5.5
Yes. SOTA in Reasoning (tied), Coding (tied), Coding › Agentic (tied), Coding › Web dev, Long context (tied), and Factuality (tied).
GLM 5.3 Flash
Yes. Yes on Coding (best per dollar); Coding › Agentic (best per dollar). Not the overall leader.
| Category | Claude Opus 5.5 | GLM 5.3 Flash |
|---|---|---|
| General LLM | #2 · Near-SOTA · General LLM Margin 1.0638297872340416 LMArena leaderboard dataset · Oct 13, 2026 | #34 · #34 in General LLM Margin 18.085106382978722 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #1 · Co-SOTA · Reasoning Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #27 · #27 in Reasoning Margin 14.893617021276597 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 | #34 · #34 in Science Margin — Epoch AI benchmarking hub · Aug 20, 2026 |
| Coding | #1 · Co-SOTA · Coding Margin 0 Terminal-Bench Harbor Hub · Oct 6, 2026 | #10 · #10 in Coding Margin 50 Terminal-Bench Harbor Hub · Oct 6, 2026 |
| Coding › Agentic | #1 · Co-SOTA · Coding › Agentic Margin 0 Terminal-Bench Harbor Hub · Oct 6, 2026 | #10 · #10 in Coding › Agentic Margin 50 Terminal-Bench Harbor Hub · Oct 6, 2026 |
| Coding › Web dev | #1 · SOTA · Coding › Web dev Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #24 · #24 in Coding › Web dev Margin 18.400000000000006 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #1 · Co-SOTA · Long context Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #35 · #35 in Long context Margin 18.61702127659575 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #4 · Near-SOTA · Vision Margin 13.15789473684211 Epoch AI benchmarking hub · Sep 22, 2026 | #29 · #29 in Vision Margin 86.84210526315789 Epoch AI benchmarking hub · Aug 20, 2026 |
| Factuality | #1 · Co-SOTA · Factuality Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #34 · #34 in Factuality Margin 20.34883720930233 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #1 · #1 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Sep 22, 2026 | #14 · #14 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Aug 20, 2026 |
Claude Opus 5.5: $8.000000000000002 per 1M blended tokens.
GLM 5.3 Flash: $0.2375 per 1M blended tokens.
Claude Opus 5.5: closed weights.
GLM 5.3 Flash: open weights.
General LLM: As of Oct 15, 2026, Claude Opus 5.5 leads GLM 5.3 Flash in General LLM at #2 against #34.
Reasoning: As of Oct 15, 2026, Claude Opus 5.5 leads GLM 5.3 Flash in Reasoning at #1 against #27.
Science: As of Oct 15, 2026, Claude Opus 5.5 leads GLM 5.3 Flash in Science at #31 against #34.
Coding: As of Oct 15, 2026, Claude Opus 5.5 leads GLM 5.3 Flash in Coding at #1 against #10.
Coding › Agentic: As of Oct 15, 2026, Claude Opus 5.5 leads GLM 5.3 Flash in Coding › Agentic at #1 against #10.
Coding › Web dev: As of Oct 15, 2026, Claude Opus 5.5 leads GLM 5.3 Flash in Coding › Web dev at #1 against #24.
Long context: As of Oct 15, 2026, Claude Opus 5.5 leads GLM 5.3 Flash in Long context at #1 against #35.
Vision: As of Oct 15, 2026, Claude Opus 5.5 leads GLM 5.3 Flash in Vision at #4 against #29.
Factuality: As of Oct 15, 2026, Claude Opus 5.5 leads GLM 5.3 Flash in Factuality at #1 against #34.
Abstraction (ARC): As of Oct 15, 2026, Claude Opus 5.5 leads GLM 5.3 Flash in Abstraction (ARC) at #1 against #14.
Claude Opus 5.5 · GLM 5.3 Flash
Claude Opus 5.5 or GLM 5.3 Flash?
As of Oct 15, 2026, Claude Opus 5.5 leads GLM 5.3 Flash in 10 of 10 shared categories: General LLM, Reasoning, Science, Coding, Coding › Agentic, Coding › Web dev, Long context, Vision, Factuality, and Abstraction (ARC).
Claude Opus 5.5 or GLM 5.3 Flash for General LLM?
As of Oct 15, 2026, Claude Opus 5.5 leads GLM 5.3 Flash in General LLM at #2 against #34.
Claude Opus 5.5 or GLM 5.3 Flash for Reasoning?
As of Oct 15, 2026, Claude Opus 5.5 leads GLM 5.3 Flash in Reasoning at #1 against #27.
Claude Opus 5.5 or GLM 5.3 Flash for Science?
As of Oct 15, 2026, Claude Opus 5.5 leads GLM 5.3 Flash in Science at #31 against #34.