Gemini 3.8 Flash vs GPT-6 Astra
Gemini 3.8 Flash 
GPT-6 Astra Verdict
- GPT-6 Astra (max) leads on quality: 70.6 vs 63.5.
- Gemini 3.8 Flash (medium) is stronger in composite, long context, multimodal.
- GPT-6 Astra (max) is stronger in coding, knowledge, agents & tools, maths, reasoning.
- Gemini 3.8 Flash (medium) is 15× cheaper ($1.50 vs $22.00 per 1M blended).
- Gemini 3.8 Flash (medium) streams 5.1× faster (273 vs 54 tokens per second).
| Metric | Gemini 3.8 Flash (medium) | GPT-6 Astra (max) |
|---|---|---|
| BenchLeader Index | 63.5 | 70.6 |
| Coding score | 63.6 | 79.0 |
| Composite score | 79.4 | 73.1 |
| Knowledge score | 77.6 | 79.8 |
| Long context score | 68.7 | – |
| Multimodal score | 68.9 | – |
| Agents & tools score | – | 68.2 |
| Maths score | – | 77.0 |
| Reasoning score | – | 70.9 |
| Blended price $/M | $1.50 | $22.00 |
| Output speed | 273 tok/s | 54 tok/s |
| Time to first answer | 13.8 s | 328.6 s |
| Context window | 1M | 1.1M |
| GPQA Diamond | – | 95.8% |
| FrontierMath Tiers 1–3 | – | 93.7% |
| FrontierMath Tier 4 | – | 97.6% |
| OTIS Mock AIME | – | 100.0% |
| SimpleQA Verified | – | 75.6% |
| Terminal-Bench | – | 58.2% |
| SciCode | 54.4% | 56.5% |
| FrontierCode | – | 53.3% |
| LMArena WebDev | – | 1796 |
| LMArena Agent | – | 12.5 |
| LiveBench | – | 82.2% |
| LiveBench Reasoning | – | 92.7% |
| LiveBench Coding | – | 80.4% |
| LiveBench Agentic Coding | – | 57.3% |
| LiveBench Mathematics | – | 96.8% |
| LiveBench Data Analysis | – | 83.0% |
| LiveBench Language | – | 89.4% |
| AA Intelligence Index | 40 | – |
| AA-LCR | 84.0% | – |
| MMMU-Pro | 84.2% | – |
| AA-Omniscience | 28.6 | – |
| GPQA Diamond (AA) | 93.5% | – |
| Humanity's Last Exam (AA) | 42.1% | – |
| SciCode (AA) | 55.1% | – |
| Terminal-Bench 2.1 (Vals) | – | 87.3% |
| Vals Index | – | 66.6 |
| ARC-AGI-1 | – | 97.5% |
| ARC-AGI-2 | – | 95.0% |
| ARC-AGI-3 | – | 62.7% |
Data as of 2026-09-09. Best configuration of each model; every score links to its source on the model pages.