Claude Sonnet 5.5 vs GLM 5.3 Flash
As of Oct 14, 2026, Claude Sonnet 5.5 leads GLM 5.3 Flash in 9 of 9 shared categories: General LLM, Reasoning, Science, Coding, Coding › Agentic, Coding › Web dev, Long context, Vision, and Factuality.
Claude Sonnet 5.5
Yes. SOTA in co-SOTA in Coding, co-SOTA in Coding › Agentic and co-SOTA in Vision.
GLM 5.3 Flash
Yes. Yes on Coding (best per dollar); Coding › Agentic (best per dollar). Not the overall leader.
| Category | Claude Sonnet 5.5 | GLM 5.3 Flash |
|---|---|---|
| General LLM | #27 · #27 in General LLM Margin 18.367346938775512 LMArena leaderboard dataset · Oct 13, 2026 | #30 · #30 in General LLM Margin 20.40816326530613 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #18 · #18 in Reasoning Margin 13.013698630136986 LMArena leaderboard dataset · Oct 13, 2026 | #26 · #26 in Reasoning Margin 18.493150684931507 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #4 · #4 in Math Margin 6.666666666666671 Epoch AI benchmarking hub · Sep 28, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Science | #3 · #3 in Science Margin — Epoch AI benchmarking hub · Sep 28, 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 | #3 · Near-SOTA · Coding › Web dev Margin 1.8691588785046775 LMArena leaderboard dataset · Oct 13, 2026 | #22 · #22 in Coding › Web dev Margin 19.626168224299064 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #11 · #11 in Long context Margin 7.482993197278915 LMArena leaderboard dataset · Oct 13, 2026 | #30 · #30 in Long context Margin 20.40816326530613 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #1 · Co-SOTA · Vision Margin 0 Epoch AI benchmarking hub · Sep 28, 2026 | #29 · #29 in Vision Margin 86.84210526315789 Epoch AI benchmarking hub · Aug 20, 2026 |
| Factuality | #16 · #16 in Factuality Margin 12.68656716417911 LMArena leaderboard dataset · Oct 13, 2026 | #30 · #30 in Factuality Margin 23.13432835820896 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | — | #14 · #14 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Aug 20, 2026 |
Claude Sonnet 5.5: $4.000000000000001 per 1M blended tokens.
GLM 5.3 Flash: $0.252 per 1M blended tokens.
Claude Sonnet 5.5: closed weights.
GLM 5.3 Flash: open weights.
General LLM: As of Oct 14, 2026, Claude Sonnet 5.5 leads GLM 5.3 Flash in General LLM at #27 against #30.
Reasoning: As of Oct 14, 2026, Claude Sonnet 5.5 leads GLM 5.3 Flash in Reasoning at #18 against #26.
Science: As of Oct 14, 2026, Claude Sonnet 5.5 leads GLM 5.3 Flash in Science at #3 against #34.
Coding: As of Oct 14, 2026, Claude Sonnet 5.5 leads GLM 5.3 Flash in Coding at #1 against #10.
Coding › Agentic: As of Oct 14, 2026, Claude Sonnet 5.5 leads GLM 5.3 Flash in Coding › Agentic at #1 against #10.
Coding › Web dev: As of Oct 14, 2026, Claude Sonnet 5.5 leads GLM 5.3 Flash in Coding › Web dev at #3 against #22.
Long context: As of Oct 14, 2026, Claude Sonnet 5.5 leads GLM 5.3 Flash in Long context at #11 against #30.
Vision: As of Oct 14, 2026, Claude Sonnet 5.5 leads GLM 5.3 Flash in Vision at #1 against #29.
Factuality: As of Oct 14, 2026, Claude Sonnet 5.5 leads GLM 5.3 Flash in Factuality at #16 against #30.
Claude Sonnet 5.5 · GLM 5.3 Flash
Claude Sonnet 5.5 or GLM 5.3 Flash?
As of Oct 14, 2026, Claude Sonnet 5.5 leads GLM 5.3 Flash in 9 of 9 shared categories: General LLM, Reasoning, Science, Coding, Coding › Agentic, Coding › Web dev, Long context, Vision, and Factuality.
Claude Sonnet 5.5 or GLM 5.3 Flash for General LLM?
As of Oct 14, 2026, Claude Sonnet 5.5 leads GLM 5.3 Flash in General LLM at #27 against #30.
Claude Sonnet 5.5 or GLM 5.3 Flash for Reasoning?
As of Oct 14, 2026, Claude Sonnet 5.5 leads GLM 5.3 Flash in Reasoning at #18 against #26.
Claude Sonnet 5.5 or GLM 5.3 Flash for Science?
As of Oct 14, 2026, Claude Sonnet 5.5 leads GLM 5.3 Flash in Science at #3 against #34.