GLM 5.3 Flash vs GPT-5.4 Pro
GLM 5.3 Flash 
GPT-5.4 Pro Verdict
- GPT-5.4 Pro leads on quality: 64.3 vs 61.1.
- GLM 5.3 Flash is stronger in agents & tools, coding, composite, human preference, long context.
- GPT-5.4 Pro is stronger in knowledge, multimodal, reasoning, instruction following.
- GLM 5.3 Flash is 567× cheaper ($0.119 vs $67.50 per 1M blended).
- GLM 5.3 Flash streams 89.6× faster (90 vs 1 tokens per second).
| Metric | GLM 5.3 Flash | GPT-5.4 Pro |
|---|---|---|
| BenchLeader Index | 61.1 | 64.3 |
| Agents & tools score | 52.1 | – |
| Coding score | 64.3 | – |
| Composite score | 61.7 | – |
| Human preference score | 67.6 | – |
| Knowledge score | 67.7 | 73.6 |
| Long context score | 66.6 | – |
| Multimodal score | 65.5 | 69.8 |
| Reasoning score | 67.5 | 75.3 |
| Instruction following score | – | 67.3 |
| Blended price $/M | $0.119 | $67.50 |
| Output speed | 90 tok/s | 1 tok/s |
| Time to first answer | 24.9 s | 6.5 s |
| Context window | 1M | 1.1M |
| Humanity's Last Exam | – | 44.3% |
| SimpleBench | – | 74.1% |
| SciCode | 46.1% | – |
| Epoch Capabilities Index | 151.4 | 158.9 |
| 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% | – |
| MultiChallenge | – | 69.2% |
| VISTA | – | 53.9% |
| MultiNRC | – | 62.3% |
| TutorBench | – | 56.6% |
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-5.4 Pro: questions
- Is GLM 5.3 Flash better than GPT-5.4 Pro?
- GPT-5.4 Pro leads on quality: 64.3 vs 61.1. The BenchLeader Index combines every independent quality benchmark; GPT-5.4 Pro 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-5.4 Pro?
- GLM 5.3 Flash is cheaper: $0.119 against $67.50 per million tokens, blended at three input tokens per output token.
- Which is faster, GLM 5.3 Flash or GPT-5.4 Pro?
- GLM 5.3 Flash streams faster: 90 against 1 output tokens per second.
- Which has the larger context window?
- GPT-5.4 Pro accepts more context: 1.1M against 1M tokens.