Gemini 3.8 Flash vs GPT-5.2
Gemini 3.8 Flash 
GPT-5.2 Verdict
- Gemini 3.8 Flash (medium) leads on quality: 63.6 vs 61.6.
- Gemini 3.8 Flash (medium) is stronger in coding, composite, knowledge, long context, multimodal.
- GPT-5.2 is stronger in agents & tools, human preference, instruction following, reasoning.
- Gemini 3.8 Flash (medium) is 3.2× cheaper ($1.50 vs $4.81 per 1M blended).
- Gemini 3.8 Flash (medium) streams 1.3× faster (90 vs 68 tokens per second).
| Metric | Gemini 3.8 Flash (medium) | GPT-5.2 |
|---|---|---|
| BenchLeader Index | 63.6 | 61.6 |
| Coding score | 63.8 | 53.7 |
| Composite score | 79.6 | 67.5 |
| Knowledge score | 77.7 | 61.1 |
| Long context score | 68.6 | 67.9 |
| Multimodal score | 68.8 | 59.9 |
| Agents & tools score | – | 61.2 |
| Human preference score | – | 67.9 |
| Instruction following score | – | 67.4 |
| Reasoning score | – | 61.3 |
| Blended price $/M | $1.50 | $4.81 |
| Output speed | 90 tok/s | 68 tok/s |
| Time to first answer | 11.7 s | 129.4 s |
| Context window | 1M | 400k |
| Humanity's Last Exam | – | 27.8% |
| Terminal-Bench | – | 64.9% |
| SimpleBench | – | 45.8% |
| SciCode | 54.4% | – |
| Remote Labor Index | – | 2.1% |
| APEX-Agents | – | 23.0% |
| Epoch Capabilities Index | – | 153.5 |
| LMArena Text | – | 1476 |
| LMArena Hard Prompts | – | 1497 |
| LMArena Coding | – | 1515 |
| LMArena WebDev | – | 1417 |
| LMArena Vision | – | 1268 |
| AA Intelligence Index | 40 | 30.4 |
| IFBench | – | 75.4% |
| AA-LCR | 84.0% | 82.7% |
| MMMU-Pro | 84.2% | – |
| AA-Omniscience | 28.6 | -0.9 |
| Terminal-Bench Hard | – | 47.0% |
| GPQA Diamond (AA) | 93.5% | 90.3% |
| Humanity's Last Exam (AA) | 42.1% | 37.7% |
| SciCode (AA) | 55.1% | – |
| τ²-Bench Telecom (AA) | – | 84.8% |
| SWE-Bench Pro | – | 29.9% |
| VISTA | – | 46.6% |
| MultiNRC | – | 42.2% |
| TutorBench | – | 53.5% |
| Kagi LLM Benchmark | – | 73.3% |
| SWE-bench Verified (bash only) | – | 69.0% |
| ARC-AGI-1 | – | 94.5% |
| ARC-AGI-2 | – | 72.9% |
| BFCL Overall | – | 55.9% |
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 GPT-5.2: questions
- Is Gemini 3.8 Flash better than GPT-5.2?
- Gemini 3.8 Flash (medium) leads on quality: 63.6 vs 61.6. 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 GPT-5.2 for coding?
- Gemini 3.8 Flash scores higher in coding (64 vs 54 on the category index, where 50 is average).
- Which is cheaper, Gemini 3.8 Flash or GPT-5.2?
- Gemini 3.8 Flash is cheaper: $1.50 against $4.81 per million tokens, blended at three input tokens per output token.
- Which is faster, Gemini 3.8 Flash or GPT-5.2?
- Gemini 3.8 Flash streams faster: 90 against 68 output tokens per second.
- Which has the larger context window?
- Gemini 3.8 Flash accepts more context: 1M against 400k tokens.