Gemini 3.6 Flash vs GPT-5.6 Terra
Gemini 3.6 Flash 
GPT-5.6 Terra Verdict
- GPT-5.6 Terra (xhigh) leads on quality: 64.4 vs 60.8.
- Gemini 3.6 Flash is stronger in knowledge, long context, multimodal.
- GPT-5.6 Terra (xhigh) is stronger in coding, composite, maths, agents & tools, human preference, instruction following, reasoning.
- Gemini 3.6 Flash is 3.0× cheaper ($1.50 vs $4.50 per 1M blended).
- Gemini 3.6 Flash streams 2.5× faster (194 vs 79 tokens per second).
| Metric | Gemini 3.6 Flash | GPT-5.6 Terra (xhigh) |
|---|---|---|
| BenchLeader Index | 60.8 | 64.4 |
| Coding score | 49.8 | 63.7 |
| Composite score | 72.4 | 77.3 |
| Knowledge score | 74.7 | 61.0 |
| Long context score | 66.6 | 66.0 |
| Maths score | 54.8 | 71.0 |
| Multimodal score | 67.8 | 63.0 |
| Agents & tools score | – | 69.8 |
| Human preference score | – | 66.7 |
| Instruction following score | – | 65.3 |
| Reasoning score | – | 58.6 |
| Blended price $/M | $1.50 | $4.50 |
| Output speed | 194 tok/s | 79 tok/s |
| Time to first answer | 16.8 s | 33.6 s |
| Context window | 1.0M | 1M |
| SimpleBench | – | 48.9% |
| SciCode | – | 51.6% |
| FrontierCode | 34.4% | – |
| ProofBench | 36.0% | 74.0% |
| Epoch Capabilities Index | 154.3 | – |
| LMArena Text | – | 1466 |
| LMArena Hard Prompts | – | 1491 |
| LMArena Coding | – | 1519 |
| LMArena WebDev | – | 1521 |
| LMArena Vision | – | 1269 |
| LMArena Agent | – | 1.5 |
| AA Intelligence Index | 34.3 | 38.2 |
| IFBench | – | 66.3% |
| AA-LCR | 80.0% | 79.0% |
| MMMU-Pro | 83.2% | 79.5% |
| AA-Omniscience | 22.1 | -3.0 |
| Terminal-Bench Hard | – | 62.9% |
| GPQA Diamond (AA) | 92.8% | 90.8% |
| Humanity's Last Exam (AA) | 40.8% | 41.9% |
| SciCode (AA) | 53.4% | 52.3% |
| τ²-Bench Telecom (AA) | – | 80.4% |
| LiveCodeBench | – | 85.9% |
| MMLU-Pro | – | 86.7% |
| IOI | – | 65.3% |
| CorpFin | – | 65.3% |
| TaxEval | – | 76.2% |
| GPQA Diamond (Vals) | – | 90.9% |
| AIME 2026 | 96.7% | – |
| HMMT February 2026 | 89.4% | – |
| MathArena Apex | 26.0% | – |
| ARC-AGI-1 | – | 94.0% |
| ARC-AGI-2 | – | 74.2% |
| ARC-AGI-3 | – | 0.7% |
Data as of 2026-09-10. Best configuration of each model; every score links to its source on the model pages.
Gemini 3.6 Flash vs GPT-5.6 Terra: questions
- Is Gemini 3.6 Flash better than GPT-5.6 Terra?
- GPT-5.6 Terra (xhigh) leads on quality: 64.4 vs 60.8. The BenchLeader Index combines every independent quality benchmark; GPT-5.6 Terra (xhigh) is ahead overall as of 2026-09-10, but check the category scores for your use.
- Is Gemini 3.6 Flash better than GPT-5.6 Terra for coding?
- GPT-5.6 Terra scores higher in coding (64 vs 50 on the category index, where 50 is average).
- Which is cheaper, Gemini 3.6 Flash or GPT-5.6 Terra?
- Gemini 3.6 Flash is cheaper: $1.50 against $4.50 per million tokens, blended at three input tokens per output token.
- Which is faster, Gemini 3.6 Flash or GPT-5.6 Terra?
- Gemini 3.6 Flash streams faster: 194 against 79 output tokens per second.
- Which has the larger context window?
- Gemini 3.6 Flash accepts more context: 1.0M against 1M tokens.