Gemini 3.8 Flash vs GLM 5.3 Flash
Gemini 3.8 Flash 
GLM 5.3 Flash Verdict
- Gemini 3.8 Flash (medium) leads on quality: 63.6 vs 61.1.
- Gemini 3.8 Flash (medium) is stronger in composite, knowledge, long context, multimodal.
- GLM 5.3 Flash is stronger in coding, agents & tools, human preference, reasoning.
- GLM 5.3 Flash is 13× cheaper ($0.119 vs $1.50 per 1M blended).
| Metric | Gemini 3.8 Flash (medium) | GLM 5.3 Flash |
|---|---|---|
| BenchLeader Index | 63.6 | 61.1 |
| Coding score | 63.8 | 64.3 |
| Composite score | 79.6 | 61.7 |
| Knowledge score | 77.7 | 67.7 |
| Long context score | 68.6 | 66.6 |
| Multimodal score | 68.8 | 65.5 |
| Agents & tools score | – | 52.1 |
| Human preference score | – | 67.6 |
| Reasoning score | – | 67.5 |
| Blended price $/M | $1.50 | $0.119 |
| Output speed | 90 tok/s | 90 tok/s |
| Time to first answer | 11.7 s | 24.9 s |
| Context window | 1M | 1M |
| SciCode | 54.4% | 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 | 40 | 41.9 |
| AA-LCR | 84.0% | 80.0% |
| MMMU-Pro | 84.2% | – |
| AA-Omniscience | 28.6 | 7.5 |
| GPQA Diamond (AA) | 93.5% | 91.2% |
| Humanity's Last Exam (AA) | 42.1% | 39.9% |
| SciCode (AA) | 55.1% | 51.6% |
Data as of 2026-09-10. Best configuration of each model; every score links to its source on the model pages.
Gemini 3.8 Flash vs GLM 5.3 Flash: questions
- Is Gemini 3.8 Flash better than GLM 5.3 Flash?
- Gemini 3.8 Flash (medium) leads on quality: 63.6 vs 61.1. The BenchLeader Index combines every independent quality benchmark; Gemini 3.8 Flash (medium) is ahead overall as of 2026-09-10, but check the category scores for your use.
- Is Gemini 3.8 Flash better than GLM 5.3 Flash for coding?
- GLM 5.3 Flash scores higher in coding (64 vs 64 on the category index, where 50 is average).
- Which is cheaper, Gemini 3.8 Flash or GLM 5.3 Flash?
- GLM 5.3 Flash is cheaper: $0.119 against $1.50 per million tokens, blended at three input tokens per output token.
- Which is faster, Gemini 3.8 Flash or GLM 5.3 Flash?
- GLM 5.3 Flash streams faster: 90 against 90 output tokens per second.
- Which has the larger context window?
- Both accept 1M tokens of context.