Gemini 3 Flash vs GPT-5
Gemini 3 Flash 
GPT-5 Verdict
- Gemini 3 Flash (thinking) and GPT-5 are level on quality (61.6 vs 60.8).
- Gemini 3 Flash (thinking) is stronger in agents & tools, composite, instruction following, knowledge, multimodal.
- GPT-5 is stronger in long context, coding, human preference, maths, reasoning.
- Gemini 3 Flash (thinking) is 3.1× cheaper ($1.13 vs $3.44 per 1M blended).
- Gemini 3 Flash (thinking) streams 2.3× faster (192 vs 85 tokens per second).
| Metric | Gemini 3 Flash (thinking) | GPT-5 |
|---|---|---|
| BenchLeader Index | 61.6 | 60.8 |
| Agents & tools score | 67.4 | 51.0 |
| Composite score | 62.3 | 58.1 |
| Instruction following score | 75.4 | 65.0 |
| Knowledge score | 69.1 | 62.2 |
| Long context score | 65.5 | 65.6 |
| Multimodal score | 64.5 | 59.6 |
| Coding score | – | 60.9 |
| Human preference score | – | 61.7 |
| Maths score | – | 72.8 |
| Reasoning score | – | 64.2 |
| Blended price $/M | $1.13 | $3.44 |
| Output speed | 192 tok/s | 85 tok/s |
| Time to first answer | 6.2 s | 60.7 s |
| Context window | 1M | 400k |
| Terminal-Bench | – | 49.6% |
| SciCode | – | 42.9% |
| Remote Labor Index | – | 1.7% |
| WeirdML | – | 39.8% |
| APEX-Agents | – | 18.3% |
| Epoch Capabilities Index | – | 150 |
| LMArena Text | – | 1427 |
| LMArena Hard Prompts | – | 1449 |
| LMArena Coding | – | 1462 |
| LMArena Vision | – | 1232 |
| AA Intelligence Index | 26.3 | 23.0 |
| IFBench | 78.0% | 73.1% |
| AA-LCR | 78.0% | 78.2% |
| MMMU-Pro | 79.9% | 74.2% |
| AA-Omniscience | 10.1 | -8.7 |
| Terminal-Bench Hard | 38.6% | 32.6% |
| GPQA Diamond (AA) | 89.8% | 85.3% |
| Humanity's Last Exam (AA) | 36.6% | 28.5% |
| τ²-Bench Telecom (AA) | 80.4% | 84.8% |
| PRBench Finance | – | 51.3% |
| PRBench Legal | – | 49.0% |
| VISTA | – | 49.7% |
| MultiNRC | – | 52.1% |
| TutorBench | – | 55.3% |
| Kagi LLM Benchmark | – | 72.7% |
| IFEval (HELM) | – | 87.5% |
| Omni-MATH (HELM) | – | 64.7% |
| WildBench (HELM) | – | 85.7% |
| MMLU-Pro (HELM) | – | 86.3% |
| GPQA Diamond (HELM) | – | 79.1% |
| HELM Capabilities mean | – | 80.7% |
| Aider Polyglot | – | 88.0% |
| SWE-bench Verified (any scaffold) | – | 75.6% |
Data as of 2026-09-12. Best configuration of each model; every score links to its source on the model pages.
Gemini 3 Flash vs GPT-5: questions
- Is Gemini 3 Flash better than GPT-5?
- Gemini 3 Flash (thinking) and GPT-5 are level on quality (61.6 vs 60.8). The BenchLeader Index combines every independent quality benchmark; Gemini 3 Flash (thinking) is ahead overall as of 2026-09-12, but check the category scores for your use.
- Is Gemini 3 Flash better than GPT-5 for agentic tasks?
- Gemini 3 Flash scores higher in agentic tasks (67 vs 51 on the category index, where 50 is average).
- Which is cheaper, Gemini 3 Flash or GPT-5?
- Gemini 3 Flash is cheaper: $1.13 against $3.44 per million tokens, blended at three input tokens per output token.
- Which is faster, Gemini 3 Flash or GPT-5?
- Gemini 3 Flash streams faster: 192 against 85 output tokens per second.
- Which has the larger context window?
- Gemini 3 Flash accepts more context: 1M against 400k tokens.