GLM 5.3 Flash vs GPT-5 Pro
GLM 5.3 Flash 
GPT-5 Pro Verdict
- GLM 5.3 Flash and GPT-5 Pro are level on quality (61.1 vs 60.8).
- GLM 5.3 Flash is stronger in agents & tools, coding, composite, human preference, long context, reasoning.
- GPT-5 Pro is stronger in knowledge, multimodal.
- GLM 5.3 Flash is 347× cheaper ($0.119 vs $41.25 per 1M blended).
| Metric | GLM 5.3 Flash | GPT-5 Pro |
|---|---|---|
| BenchLeader Index | 61.1 | 60.8 |
| Agents & tools score | 52.1 | – |
| Coding score | 64.3 | – |
| Composite score | 61.7 | – |
| Human preference score | 67.6 | – |
| Knowledge score | 67.7 | 68.0 |
| Long context score | 66.6 | – |
| Multimodal score | 65.5 | 67.4 |
| Reasoning score | 67.5 | 57.6 |
| Blended price $/M | $0.119 | $41.25 |
| Output speed | 90 tok/s | – |
| Time to first answer | 24.9 s | – |
| Context window | 1M | 400k |
| Humanity's Last Exam | – | 31.6% |
| SimpleBench | – | 61.6% |
| SciCode | 46.1% | – |
| Epoch Capabilities Index | 151.4 | 150.3 |
| LMArena Text | 1474 | – |
| LMArena Hard Prompts | 1496 | – |
| LMArena Coding | 1534 | – |
| LMArena WebDev | 1605 | – |
| LMArena Vision | 1296 | – |
| LMArena Agent | 2 | – |
| LiveBench | 71.6% | – |
| LiveBench Reasoning | 77.6% | – |
| LiveBench Coding | 79.0% | – |
| LiveBench Agentic Coding | 56.8% | – |
| LiveBench Mathematics | 81.2% | – |
| LiveBench Data Analysis | 76.4% | – |
| LiveBench Language | 77.3% | – |
| AA Intelligence Index | 41.9 | – |
| AA-LCR | 80.0% | – |
| AA-Omniscience | 7.5 | – |
| GPQA Diamond (AA) | 91.2% | – |
| Humanity's Last Exam (AA) | 39.9% | – |
| SciCode (AA) | 51.6% | – |
| 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 2026-09-10. Best configuration of each model; every score links to its source on the model pages.
GLM 5.3 Flash vs GPT-5 Pro: questions
- Is GLM 5.3 Flash better than GPT-5 Pro?
- GLM 5.3 Flash and GPT-5 Pro are level on quality (61.1 vs 60.8). The BenchLeader Index combines every independent quality benchmark; GLM 5.3 Flash is ahead overall as of 2026-09-10, but check the category scores for your use.
- Which is cheaper, GLM 5.3 Flash or GPT-5 Pro?
- GLM 5.3 Flash is cheaper: $0.119 against $41.25 per million tokens, blended at three input tokens per output token.
- Which has the larger context window?
- GLM 5.3 Flash accepts more context: 1M against 400k tokens.