Claude Opus 5 vs GLM 5.3
Claude Opus 5 
GLM 5.3 Verdict
- Claude Opus 5 leads on quality: 70.0 vs 60.0.
- Claude Opus 5 is stronger in agents & tools, coding, composite, human preference, knowledge, long context, maths, multimodal, reasoning.
- GLM 5.3 (max) is 4.7× cheaper ($2.15 vs $10.00 per 1M blended).
| Metric | Claude Opus 5 | GLM 5.3 (max) |
|---|---|---|
| BenchLeader Index | 70.0 | 60.0 |
| Agents & tools score | 71.5 | 52.9 |
| Coding score | 74.5 | 65.2 |
| Composite score | 93.1 | – |
| Human preference score | 78.2 | 68.6 |
| Knowledge score | 70.6 | 55.8 |
| Long context score | 66.2 | – |
| Maths score | 67.1 | 60.0 |
| Multimodal score | 69.4 | – |
| Reasoning score | 71.5 | 66.9 |
| Blended price $/M | $10.00 | $2.15 |
| Output speed | 51 tok/s | 56 tok/s |
| Time to first answer | 93.0 s | 37.4 s |
| Context window | 1M | 1.3M |
| GPQA Diamond | 92.9% | 90.9% |
| FrontierMath Tiers 1–3 | – | 68.8% |
| FrontierMath Tier 4 | – | 29.3% |
| OTIS Mock AIME | 97.8% | 91.1% |
| SimpleQA Verified | – | 41.0% |
| Terminal-Bench | – | 41.8% |
| SimpleBench | 80.6% | – |
| SciCode | – | 56.5% |
| WeirdML | 86.3% | 75.4% |
| ProofBench | – | 49.0% |
| Epoch Capabilities Index | 162.6 | – |
| LMArena Text | – | 1482 |
| LMArena Hard Prompts | – | 1507 |
| LMArena Coding | – | 1528 |
| LMArena WebDev | – | 1613 |
| LMArena Agent | – | 2.6 |
| AA Intelligence Index | 50.7 | – |
| AA-LCR | 79.3% | – |
| MMMU-Pro | 84.7% | – |
| AA-Omniscience | 37.1 | – |
| GPQA Diamond (AA) | 93.2% | – |
| Humanity's Last Exam (AA) | 54.9% | – |
| SciCode (AA) | 56.4% | – |
| LiveCodeBench | 89.0% | 80.5% |
| MMLU-Pro | 91.6% | 86.8% |
| IOI | 91.7% | – |
| LegalBench | 87.0% | 84.8% |
| CorpFin | 73.2% | – |
| TaxEval | 75.1% | 72.4% |
| Terminal-Bench 2.1 (Vals) | 84.6% | 71.5% |
| SWE-bench (Vals) | 97.0% | 95.4% |
| GPQA Diamond (Vals) | 93.4% | 88.1% |
| Vals Index | 67.2 | 57.0 |
| HiL-Bench | 57.0% | – |
| EQ-Bench 4 | 1385 | – |
Data as of 2026-09-10. Best configuration of each model; every score links to its source on the model pages.
Claude Opus 5 vs GLM 5.3: questions
- Is Claude Opus 5 better than GLM 5.3?
- Claude Opus 5 leads on quality: 70.0 vs 60.0. The BenchLeader Index combines every independent quality benchmark; Claude Opus 5 is ahead overall as of 2026-09-10, but check the category scores for your use.
- Is Claude Opus 5 better than GLM 5.3 for coding?
- Claude Opus 5 scores higher in coding (75 vs 65 on the category index, where 50 is average).
- Is Claude Opus 5 better than GLM 5.3 for agentic tasks?
- Claude Opus 5 scores higher in agentic tasks (72 vs 53 on the category index, where 50 is average).
- Which is cheaper, Claude Opus 5 or GLM 5.3?
- GLM 5.3 is cheaper: $2.15 against $10.00 per million tokens, blended at three input tokens per output token.
- Which is faster, Claude Opus 5 or GLM 5.3?
- GLM 5.3 streams faster: 56 against 51 output tokens per second.
- Which has the larger context window?
- GLM 5.3 accepts more context: 1.3M against 1M tokens.