Gemini 3.6 Flash vs GPT-5.5 Instant
Gemini 3.6 Flash 
GPT-5.5 Instant Verdict
- Gemini 3.6 Flash and GPT-5.5 Instant are level on quality (60.8 vs 60.5).
- Gemini 3.6 Flash is stronger in composite, knowledge, long context, maths, multimodal.
- GPT-5.5 Instant is stronger in coding, agents & tools, human preference, instruction following, reasoning.
- Gemini 3.6 Flash is 7.5× cheaper ($1.50 vs $11.25 per 1M blended).
- Gemini 3.6 Flash streams 1.5× faster (194 vs 129 tokens per second).
| Metric | Gemini 3.6 Flash | GPT-5.5 Instant |
|---|---|---|
| BenchLeader Index | 60.8 | 60.5 |
| Coding score | 49.8 | 61.1 |
| Composite score | 72.4 | 62.9 |
| Knowledge score | 74.7 | 69.4 |
| Long context score | 66.6 | 61.4 |
| Maths score | 54.8 | 42.5 |
| Multimodal score | 67.8 | 59.7 |
| Agents & tools score | – | 70.7 |
| Human preference score | – | 67.5 |
| Instruction following score | – | 69.8 |
| Reasoning score | – | 62.6 |
| Blended price $/M | $1.50 | $11.25 |
| Output speed | 194 tok/s | 129 tok/s |
| Time to first answer | 16.8 s | 16.8 s |
| Context window | 1.0M | 400k |
| GPQA Diamond | – | 82.5% |
| FrontierMath Tiers 1–3 | – | 26.3% |
| FrontierMath Tier 4 | – | 2.4% |
| OTIS Mock AIME | – | 68.1% |
| SciCode | – | 48.6% |
| FrontierCode | 34.4% | – |
| ProofBench | 36.0% | – |
| Epoch Capabilities Index | 154.3 | 142.5 |
| LMArena Text | – | 1474 |
| LMArena Hard Prompts | – | 1491 |
| LMArena Coding | – | 1514 |
| LMArena Vision | – | 1251 |
| AA Intelligence Index | 34.3 | 26.8 |
| IFBench | – | 71.5% |
| AA-LCR | 80.0% | 70.0% |
| MMMU-Pro | 83.2% | – |
| AA-Omniscience | 22.1 | 11.2 |
| Terminal-Bench Hard | – | 42.4% |
| GPQA Diamond (AA) | 92.8% | 84.7% |
| Humanity's Last Exam (AA) | 40.8% | 21.6% |
| SciCode (AA) | 53.4% | 52.5% |
| τ²-Bench Telecom (AA) | – | 49.4% |
| AIME 2026 | 96.7% | – |
| HMMT February 2026 | 89.4% | – |
| MathArena Apex | 26.0% | – |
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-5.5 Instant: questions
- Is Gemini 3.6 Flash better than GPT-5.5 Instant?
- Gemini 3.6 Flash and GPT-5.5 Instant are level on quality (60.8 vs 60.5). The BenchLeader Index combines every independent quality benchmark; Gemini 3.6 Flash is ahead overall as of 2026-09-10, but check the category scores for your use.
- Is Gemini 3.6 Flash better than GPT-5.5 Instant for coding?
- GPT-5.5 Instant scores higher in coding (61 vs 50 on the category index, where 50 is average).
- Which is cheaper, Gemini 3.6 Flash or GPT-5.5 Instant?
- Gemini 3.6 Flash is cheaper: $1.50 against $11.25 per million tokens, blended at three input tokens per output token.
- Which is faster, Gemini 3.6 Flash or GPT-5.5 Instant?
- Gemini 3.6 Flash streams faster: 194 against 129 output tokens per second.
- Which has the larger context window?
- Gemini 3.6 Flash accepts more context: 1.0M against 400k tokens.