# 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: $4.000000000000001 per 1M blended tokens.

GLM 5.3 Flash: $0.2375 per 1M blended tokens.

Claude Sonnet 5.5: closed weights.

GLM 5.3 Flash: open weights.

- Which to pick, General LLM: As of Oct 14, 2026, Claude Sonnet 5.5 leads GLM 5.3 Flash in General LLM at #27 against #30.
- Which to pick, Reasoning: As of Oct 14, 2026, Claude Sonnet 5.5 leads GLM 5.3 Flash in Reasoning at #18 against #26.
- Which to pick, Science: As of Oct 14, 2026, Claude Sonnet 5.5 leads GLM 5.3 Flash in Science at #3 against #34.
- Which to pick, Coding: As of Oct 14, 2026, Claude Sonnet 5.5 leads GLM 5.3 Flash in Coding at #1 against #10.
- Which to pick, Coding › Agentic: As of Oct 14, 2026, Claude Sonnet 5.5 leads GLM 5.3 Flash in Coding › Agentic at #1 against #10.
- Which to pick, 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.
- Which to pick, Long context: As of Oct 14, 2026, Claude Sonnet 5.5 leads GLM 5.3 Flash in Long context at #11 against #30.
- Which to pick, Vision: As of Oct 14, 2026, Claude Sonnet 5.5 leads GLM 5.3 Flash in Vision at #1 against #29.
- Which to pick, Factuality: As of Oct 14, 2026, Claude Sonnet 5.5 leads GLM 5.3 Flash in Factuality at #16 against #30.

As of Oct 14, 2026, Claude Sonnet 5.5 is tied for state of the art in Coding (since Oct 6, 2026; sources Terminal-Bench 4.0; methodology v1.0).

As of Oct 14, 2026, GLM 5.3 Flash is state of the art on best per dollar in Reasoning (since Oct 14, 2026; sources LMArena Text (style-controlled, hard prompts); methodology v1.0).