GLM 5.3 Flash vs Grok 4.3
GLM 5.3 Flash 
Grok 4.3 Verdict
- GLM 5.3 Flash and Grok 4.3 (medium) are level on quality (61.1 vs 60.7).
- GLM 5.3 Flash is stronger in coding, composite, human preference, long context, multimodal, reasoning.
- Grok 4.3 (medium) is stronger in agents & tools, knowledge, instruction following.
- GLM 5.3 Flash is 13× cheaper ($0.119 vs $1.56 per 1M blended).
| Metric | GLM 5.3 Flash | Grok 4.3 (medium) |
|---|---|---|
| BenchLeader Index | 61.1 | 60.7 |
| Agents & tools score | 52.1 | 60.1 |
| Coding score | 64.3 | – |
| Composite score | 61.7 | 60.3 |
| Human preference score | 67.6 | – |
| Knowledge score | 67.7 | 72.1 |
| Long context score | 66.6 | 64.0 |
| Multimodal score | 65.5 | 60.2 |
| Reasoning score | 67.5 | – |
| Instruction following score | – | 80.0 |
| Blended price $/M | $0.119 | $1.56 |
| Output speed | 90 tok/s | 112 tok/s |
| Time to first answer | 24.9 s | 12.1 s |
| Context window | 1M | 1M |
| SciCode | 46.1% | – |
| Epoch Capabilities Index | 151.4 | – |
| 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 | 24.8 |
| IFBench | – | 83.3% |
| AA-LCR | 80.0% | 75.0% |
| MMMU-Pro | – | 75.8% |
| AA-Omniscience | 7.5 | 16.7 |
| Terminal-Bench Hard | – | 30.3% |
| GPQA Diamond (AA) | 91.2% | 89.0% |
| Humanity's Last Exam (AA) | 39.9% | 30.0% |
| SciCode (AA) | 51.6% | – |
| τ²-Bench Telecom (AA) | – | 91.2% |
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 Grok 4.3: questions
- Is GLM 5.3 Flash better than Grok 4.3?
- GLM 5.3 Flash and Grok 4.3 (medium) are level on quality (61.1 vs 60.7). 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.
- Is GLM 5.3 Flash better than Grok 4.3 for agentic tasks?
- Grok 4.3 scores higher in agentic tasks (60 vs 52 on the category index, where 50 is average).
- Which is cheaper, GLM 5.3 Flash or Grok 4.3?
- GLM 5.3 Flash is cheaper: $0.119 against $1.56 per million tokens, blended at three input tokens per output token.
- Which is faster, GLM 5.3 Flash or Grok 4.3?
- Grok 4.3 streams faster: 112 against 90 output tokens per second.
- Which has the larger context window?
- Both accept 1M tokens of context.