Gemini 3 Flash vs GPT-5.2
Gemini 3 Flash 
GPT-5.2 Verdict
- Gemini 3 Flash (thinking) and GPT-5.2 are level on quality (61.6 vs 61.6).
- Gemini 3 Flash (thinking) is stronger in agents & tools, instruction following, knowledge, multimodal.
- GPT-5.2 is stronger in composite, long context, coding, human preference, reasoning.
- Gemini 3 Flash (thinking) is 4.3× cheaper ($1.13 vs $4.81 per 1M blended).
- Gemini 3 Flash (thinking) streams 2.6× faster (180 vs 68 tokens per second).
| Metric | Gemini 3 Flash (thinking) | GPT-5.2 |
|---|---|---|
| BenchLeader Index | 61.6 | 61.6 |
| Agents & tools score | 67.4 | 61.2 |
| Composite score | 62.3 | 67.5 |
| Instruction following score | 75.4 | 67.4 |
| Knowledge score | 69.0 | 61.1 |
| Long context score | 65.5 | 67.9 |
| Multimodal score | 64.4 | 59.9 |
| Coding score | – | 53.7 |
| Human preference score | – | 67.9 |
| Reasoning score | – | 61.3 |
| Blended price $/M | $1.13 | $4.81 |
| Output speed | 180 tok/s | 68 tok/s |
| Time to first answer | 6.1 s | 129.4 s |
| Context window | 1M | 400k |
| Humanity's Last Exam | – | 27.8% |
| Terminal-Bench | – | 64.9% |
| SimpleBench | – | 45.8% |
| 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 | 26.3 | 30.4 |
| IFBench | 78.0% | 75.4% |
| AA-LCR | 78.0% | 82.7% |
| MMMU-Pro | 79.9% | – |
| AA-Omniscience | 10.1 | -0.9 |
| Terminal-Bench Hard | 38.6% | 47.0% |
| GPQA Diamond (AA) | 89.8% | 90.3% |
| Humanity's Last Exam (AA) | 36.6% | 37.7% |
| τ²-Bench Telecom (AA) | 80.4% | 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 Flash vs GPT-5.2: questions
- Is Gemini 3 Flash better than GPT-5.2?
- Gemini 3 Flash (thinking) and GPT-5.2 are level on quality (61.6 vs 61.6). The BenchLeader Index combines every independent quality benchmark; GPT-5.2 is ahead overall as of 2026-09-10, but check the category scores for your use.
- Is Gemini 3 Flash better than GPT-5.2 for agentic tasks?
- Gemini 3 Flash scores higher in agentic tasks (67 vs 61 on the category index, where 50 is average).
- Which is cheaper, Gemini 3 Flash or GPT-5.2?
- Gemini 3 Flash is cheaper: $1.13 against $4.81 per million tokens, blended at three input tokens per output token.
- Which is faster, Gemini 3 Flash or GPT-5.2?
- Gemini 3 Flash streams faster: 180 against 68 output tokens per second.
- Which has the larger context window?
- Gemini 3 Flash accepts more context: 1M against 400k tokens.