GLM 5.3 vs GPT-5 Pro
GLM 5.3 
GPT-5 Pro Verdict
- GLM 5.3 (max) and GPT-5 Pro are level on quality (60.0 vs 60.8).
- GLM 5.3 (max) is stronger in agents & tools, coding, human preference, maths, reasoning.
- GPT-5 Pro is stronger in knowledge, multimodal.
- GLM 5.3 (max) is 19× cheaper ($2.15 vs $41.25 per 1M blended).
| Metric | GLM 5.3 (max) | GPT-5 Pro |
|---|---|---|
| BenchLeader Index | 60.0 | 60.8 |
| Agents & tools score | 52.8 | – |
| Coding score | 64.3 | – |
| Human preference score | 68.9 | – |
| Knowledge score | 55.8 | 68.0 |
| Maths score | 60.0 | – |
| Reasoning score | 66.9 | 57.6 |
| Multimodal score | – | 67.4 |
| Blended price $/M | $2.15 | $41.25 |
| Output speed | 66 tok/s | – |
| Time to first answer | 33.5 s | – |
| Context window | 1M | 400k |
| GPQA Diamond | 90.9% | – |
| FrontierMath Tiers 1–3 | 68.8% | – |
| FrontierMath Tier 4 | 29.3% | – |
| OTIS Mock AIME | 91.1% | – |
| SimpleQA Verified | 41.0% | – |
| Humanity's Last Exam | – | 31.6% |
| Terminal-Bench | 41.8% | – |
| SimpleBench | – | 61.6% |
| SciCode | 56.5% | – |
| WeirdML | 75.4% | – |
| ProofBench | 49.0% | – |
| Epoch Capabilities Index | – | 150.3 |
| LMArena Text | 1486 | – |
| LMArena Hard Prompts | 1509 | – |
| LMArena Coding | 1526 | – |
| LMArena WebDev | 1614 | – |
| LMArena Agent | 2.6 | – |
| 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 | 57.0 | – |
| PRBench Finance | – | 51.1% |
| PRBench Legal | – | 49.9% |
| VISTA | – | 52.4% |
| MultiNRC | – | 65.2% |
| Kagi LLM Benchmark | – | 76.8% |
| ARC-AGI-1 | – | 70.2% |
| ARC-AGI-2 | – | 18.3% |
Data as of 2026-09-13. Best configuration of each model; every score links to its source on the model pages.
GLM 5.3 vs GPT-5 Pro: questions
- Is GLM 5.3 better than GPT-5 Pro?
- GLM 5.3 (max) and GPT-5 Pro are level on quality (60.0 vs 60.8). The BenchLeader Index combines every independent quality benchmark; GPT-5 Pro is ahead overall as of 2026-09-13, but check the category scores for your use.
- Which is cheaper, GLM 5.3 or GPT-5 Pro?
- GLM 5.3 is cheaper: $2.15 against $41.25 per million tokens, blended at three input tokens per output token.
- Which has the larger context window?
- GLM 5.3 accepts more context: 1M against 400k tokens.