Gemini 3.8 Flash vs GLM-5.2
Gemini 3.8 Flash 
GLM-5.2 Verdict
- Gemini 3.8 Flash (medium) leads on quality: 64.9 vs 63.9.
- Gemini 3.8 Flash (medium) is stronger in agents & tools, composite, knowledge, long context, multimodal.
- GLM-5.2 (max) is stronger in reasoning, human preference, instruction following, maths.
- Gemini 3.8 Flash (medium) is 1.4× cheaper ($1.50 vs $2.15 per 1M blended).
| Metric | Gemini 3.8 Flash (medium) | GLM-5.2 (max) |
|---|---|---|
| BenchLeader Index | 64.9 | 63.9 |
| Agents & tools score | 74.8 | 63.8 |
| Coding score | 63.8 | 63.8 |
| Composite score | 79.7 | 72.1 |
| Knowledge score | 77.8 | 55.5 |
| Long context score | 68.5 | 65.6 |
| Multimodal score | 68.9 | – |
| Reasoning score | 65.6 | 72.9 |
| Human preference score | – | 67.2 |
| Instruction following score | – | 71.6 |
| Maths score | – | 59.0 |
| Blended price $/M | $1.50 | $2.15 |
| Output speed | 78 tok/s | 71 tok/s |
| Time to first answer | 2.3 s | 31.6 s |
| Context window | 1.0M | 1M |
| GPQA Diamond | – | 91.9% |
| FrontierMath Tiers 1–3 | – | 59.2% |
| FrontierMath Tier 4 | – | 29.3% |
| OTIS Mock AIME | – | 86.4% |
| SWE-bench Verified (Epoch) | – | 78.7% |
| SimpleQA Verified | – | 34.2% |
| SciCode | 54.4% | 50.5% |
| WeirdML | – | 70.1% |
| ProofBench | – | 35.0% |
| LMArena Text | – | 1472 |
| LMArena Hard Prompts | – | 1493 |
| LMArena Coding | – | 1510 |
| LMArena WebDev | – | 1592 |
| LMArena Agent | – | 4.4 |
| AA Intelligence Index | 40 | 34.0 |
| IFBench | – | 73.3% |
| AA-LCR | 84.0% | 78.3% |
| MMMU-Pro | 84.2% | – |
| AA-Omniscience | 28.6 | 4.4 |
| Terminal-Bench Hard | – | 50.8% |
| GPQA Diamond (AA) | 93.5% | 89.5% |
| Humanity's Last Exam (AA) | 42.1% | 41.1% |
| SciCode (AA) | 55.1% | 51.2% |
| τ²-Bench Telecom (AA) | – | 99.1% |
| Terminal-Bench 2.1 (Vals) | – | 67.8% |
| SWE-bench (Vals) | – | 82.8% |
| CritPt | 12.3% | 20.9% |
| GDPval (AA) | 47.8% | 45.3% |
| τ²-Bench Banking (AA) | 45.8% | 34.6% |
| ITBench SRE (AA) | – | 42.7% |
| APEX-Agents (AA) | – | 33.7% |
| Code Migration | – | 37.9% |
| Harvey's Legal Agent Benchmark | – | 7.1% |
| Legal Research Bench | – | 31.3% |
| ProgramBench | – | 0.5% |
| SkillsBench | – | 45.1% |
| SREBench | – | 0.0% |
| Vibe Code Bench v1.1 | – | 64.0% |
| LMArena Maths | – | 1480 |
| LMArena Creative Writing | – | 1451 |
| LMArena Instruction Following | – | 1466 |
| LMArena Multi-turn | – | 1469 |
| LMArena Longer Queries | – | 1483 |
| Chess Puzzles | – | 21.0% |
| EBR-bench | – | 9.5% |
| PostTrainBench | – | 31.7% |
| DeepSWE | 71.0% | 43.8% |
| LMCA | – | 45.8% |
| DTBench | – | 93.6% |
| CursorBench | 67.0% | 55.0% |
| ALE-Bench | – | 1010.2 |
Data as of 2026-09-19. Best configuration of each model; every score links to its source on the model pages.
Gemini 3.8 Flash vs GLM-5.2: questions
- Is Gemini 3.8 Flash better than GLM-5.2?
- Gemini 3.8 Flash (medium) leads on quality: 64.9 vs 63.9. The BenchLeader Index combines every independent quality benchmark; Gemini 3.8 Flash (medium) is ahead overall as of 2026-09-19, but check the category scores for your use.
- Is Gemini 3.8 Flash better than GLM-5.2 for coding?
- They are level in coding (64 each).
- Is Gemini 3.8 Flash better than GLM-5.2 for agentic tasks?
- Gemini 3.8 Flash scores higher in agentic tasks (75 vs 64 on the category index, where 50 is average).
- Which is cheaper, Gemini 3.8 Flash or GLM-5.2?
- 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-5.2?
- Gemini 3.8 Flash streams faster: 78 against 71 output tokens per second.
- Which has the larger context window?
- Gemini 3.8 Flash accepts more context: 1.0M against 1M tokens.