Claude Sonnet 5.5 vs GLM 5.3
Claude Sonnet 5.5 
GLM 5.3 Verdict
- Claude Sonnet 5.5 (max) leads on quality: 67.6 vs 64.0.
- Claude Sonnet 5.5 (max) is stronger in agents & tools, coding, knowledge, long context, maths, reasoning.
- GLM 5.3 (max) is stronger in composite, human preference.
- GLM 5.3 (max) is 1.9× cheaper ($2.15 vs $4.00 per 1M blended).
- Claude Sonnet 5.5 (max) streams 1.7× faster (141 vs 83 tokens per second).
| Metric | Claude Sonnet 5.5 (max) | GLM 5.3 (max) |
|---|---|---|
| BenchLeader Index | 67.6 | 64.0 |
| Agents & tools score | 69.5 | 61.3 |
| Coding score | 69.8 | 62.1 |
| Composite score | 72.6 | 80.3 |
| Knowledge score | 65.4 | 58.7 |
| Long context score | 66.6 | 65.0 |
| Maths score | 72.9 | 60.7 |
| Reasoning score | 81.1 | 68.9 |
| Human preference score | – | 67.4 |
| Blended price $/M | $4.00 | $2.15 |
| Output speed | 141 tok/s | 83 tok/s |
| Time to first answer | 487.1 s | 26.5 s |
| Context window | 1M | 1M |
| GPQA Diamond | 95.6% | 90.9% |
| FrontierMath Tiers 1–3 | 88.8% | 68.8% |
| FrontierMath Tier 4 | 80.5% | 29.3% |
| OTIS Mock AIME | 100.0% | 91.1% |
| SimpleQA Verified | 46.5% | 41.0% |
| Terminal-Bench | 61.8% | 41.8% |
| SciCode | 61.0% | 59.0% |
| WeirdML | – | 75.4% |
| APEX-Agents | 75.5% | – |
| FrontierCode | – | 40.1% |
| ProofBench | 100.0% | 49.0% |
| LMArena Text | – | 1478 |
| LMArena Hard Prompts | – | 1504 |
| LMArena Coding | – | 1520 |
| LMArena WebDev | – | 1622 |
| LMArena Agent | 12 | 2.1 |
| LiveBench | 75.7% | – |
| LiveBench Reasoning | 91.6% | – |
| LiveBench Coding | 91.4% | – |
| LiveBench Agentic Coding | 56.3% | – |
| LiveBench Mathematics | 96.1% | – |
| LiveBench Data Analysis | 59.5% | – |
| LiveBench Language | 78.0% | – |
| LiveBench Instruction Following | 56.8% | – |
| AA Intelligence Index v4.3.2 | 56 | 44.8 |
| AA-LCR | 82.7% | 79.7% |
| AA-Omniscience | 32.3 | 14.3 |
| GPQA Diamond (AA) | – | 91.7% |
| Humanity's Last Exam (AA) | 55.0% | 42.3% |
| SciCode (AA) | 61.0% | 59.0% |
| LiveCodeBench | – | 80.5% |
| MMLU-Pro | – | 86.8% |
| IOI | – | 68.4% |
| LegalBench | – | 84.8% |
| TaxEval | – | 72.4% |
| Terminal-Bench 2.1 (Vals) | – | 71.5% |
| SWE-bench (Vals) | – | 95.4% |
| GPQA Diamond (Vals) | – | 88.1% |
| Vals Index | – | 53.5 |
| CritPt | 31.4% | 19.1% |
| GDPval-AA v2.1 | 67.0% | 57.5% |
| τ³-Banking (AA) | – | 50.3% |
| ITBench SRE (AA) | – | 46.1% |
| Analyst Agent (AA) | 57.5% | – |
| Code Migration | – | 44.2% |
| CyberBench | – | 72.1% |
| Excel Modeling Benchmark | – | 56.3% |
| Finance Agent v2 | – | 55.8% |
| Harvey's Legal Agent Benchmark | – | 8.3% |
| Legal Research Bench | – | 49.0% |
| MedCode | – | 42.9% |
| MedScribe | – | 88.8% |
| MysteryMechanism | – | 23.0% |
| ProgramBench | – | 1.5% |
| Public Benefits Bench | – | 68.5% |
| SkillsBench | – | 47.5% |
| Tax Agent Bench | – | 73.1% |
| Terminal-Bench 4.0 (Vals) | – | 38.9% |
| Terminal-Bench Science | – | 4.3% |
| Vibe Code Bench 1-100 | – | 20.0% |
| Vibe Code Bench v1.1 | – | 78.1% |
| FORTRESS | – | 28.2% |
| LMArena Maths | – | 1492 |
| LMArena Creative Writing | – | 1454 |
| LMArena Instruction Following | – | 1475 |
| LMArena Multi-turn | – | 1481 |
| LMArena Longer Queries | – | 1485 |
| Chess Puzzles | – | 21.0% |
| Mystery Game Puzzles | 65.0% | 33.0% |
| DeepSWE v1.1 | – | 69.0% |
| CursorBench | 55.5% | 42.6% |
| FrontierSWE | 61.9% | 30.2% |
| Terminal-Bench 4.0 (AA) | 63.6% | 41.9% |
| Terminal-Bench 2.1 (AA) | – | 83.9% |
| AutomationBench | 71.8% | 62.2% |
| GDP.pdf | 25.8% | 11.2% |
| MLCR | 75.0% | 48.3% |
| Harvey LAB | 2.8% | 0.3% |
| EnterpriseOps-Gym | – | 36.4% |
| AA-Omniscience: accuracy | 54.0% | 33.9% |
| AA-Omniscience: non-hallucination | 53.0% | 70.5% |
| AA-Briefcase v1.1 | 1823 | 1509 |
| AA Openness Index | – | 33.3 |
Data as of 2026-10-11. Best configuration of each model; every score links to its source on the model pages.
Claude Sonnet 5.5 vs GLM 5.3: questions
- Is Claude Sonnet 5.5 better than GLM 5.3?
- Claude Sonnet 5.5 (max) leads on quality: 67.6 vs 64.0. The BenchLeader Index combines every independent quality benchmark; Claude Sonnet 5.5 (max) is ahead overall as of 2026-10-11, but check the category scores for your use.
- Is Claude Sonnet 5.5 better than GLM 5.3 for coding?
- Claude Sonnet 5.5 scores higher in coding (70 vs 62 on the category index, where 50 is average).
- Is Claude Sonnet 5.5 better than GLM 5.3 for agentic tasks?
- Claude Sonnet 5.5 scores higher in agentic tasks (70 vs 61 on the category index, where 50 is average).
- Which is cheaper, Claude Sonnet 5.5 or GLM 5.3?
- GLM 5.3 is cheaper: $2.15 against $4.00 per million tokens, blended at three input tokens per output token.
- Which is faster, Claude Sonnet 5.5 or GLM 5.3?
- Claude Sonnet 5.5 streams faster: 141 against 83 output tokens per second.
- Which has the larger context window?
- Both accept 1M tokens of context.