Gemini 3.8 Flash vs GLM 5.3
Gemini 3.8 Flash 
GLM 5.3 Verdict
- Gemini 3.8 Flash leads on quality: 61.1 vs 60.0.
- Gemini 3.8 Flash is stronger in agents & tools, composite, knowledge, long context, multimodal.
- GLM 5.3 (max) is stronger in maths, coding, human preference, reasoning.
- Gemini 3.8 Flash is 1.4× cheaper ($1.50 vs $2.15 per 1M blended).
- Gemini 3.8 Flash streams 4.2× faster (277 vs 66 tokens per second).
| Metric | Gemini 3.8 Flash | GLM 5.3 (max) |
|---|---|---|
| BenchLeader Index | 61.1 | 60.0 |
| Agents & tools score | 57.2 | 52.8 |
| Composite score | 74.1 | – |
| Knowledge score | 68.1 | 55.8 |
| Long context score | 64.9 | – |
| Maths score | 57.0 | 60.0 |
| Multimodal score | 69.9 | – |
| Coding score | – | 64.3 |
| Human preference score | – | 68.9 |
| Reasoning score | – | 66.9 |
| Blended price $/M | $1.50 | $2.15 |
| Output speed | 277 tok/s | 66 tok/s |
| Time to first answer | 12.8 s | 33.5 s |
| Context window | 1.0M | 1M |
| GPQA Diamond | – | 90.9% |
| FrontierMath Tiers 1–3 | – | 68.8% |
| FrontierMath Tier 4 | – | 29.3% |
| OTIS Mock AIME | – | 91.1% |
| SimpleQA Verified | – | 41.0% |
| Terminal-Bench | – | 41.8% |
| SciCode | – | 56.5% |
| WeirdML | – | 75.4% |
| ProofBench | 48.0% | 49.0% |
| LMArena Text | – | 1486 |
| LMArena Hard Prompts | – | 1509 |
| LMArena Coding | – | 1526 |
| LMArena WebDev | – | 1614 |
| LMArena Agent | – | 2.6 |
| AA Intelligence Index | 41.2 | – |
| AA-LCR | 81.3% | – |
| MMMU-Pro | 85.6% | – |
| AA-Omniscience | 29.6 | – |
| GPQA Diamond (AA) | 95.3% | – |
| Humanity's Last Exam (AA) | 47.8% | – |
| SciCode (AA) | 56.6% | – |
| 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 | 49.5% | – |
| PRBench Legal | 48.9% | – |
| HiL-Bench | 41.5% | – |
Data as of 2026-09-13. Best configuration of each model; every score links to its source on the model pages.
Gemini 3.8 Flash vs GLM 5.3: questions
- Is Gemini 3.8 Flash better than GLM 5.3?
- Gemini 3.8 Flash leads on quality: 61.1 vs 60.0. The BenchLeader Index combines every independent quality benchmark; Gemini 3.8 Flash is ahead overall as of 2026-09-13, but check the category scores for your use.
- Is Gemini 3.8 Flash better than GLM 5.3 for agentic tasks?
- Gemini 3.8 Flash scores higher in agentic tasks (57 vs 53 on the category index, where 50 is average).
- Which is cheaper, Gemini 3.8 Flash or GLM 5.3?
- Gemini 3.8 Flash is cheaper: $1.50 against $2.15 per million tokens, blended at three input tokens per output token.
- Which is faster, Gemini 3.8 Flash or GLM 5.3?
- Gemini 3.8 Flash streams faster: 277 against 66 output tokens per second.
- Which has the larger context window?
- Gemini 3.8 Flash accepts more context: 1.0M against 1M tokens.