Comparing 2 models
Gemini 3.8 Flash vs GPT-6 Astra
Benchmarks through
Verdict
Gemini 3.8 Flash places higher on 8 of the 11 tasks where both are ranked. Gemini 3.8 Flash costs 12.1x less per input token. GPT-6 Astra accepts 1.0x more context.
- Choose Gemini 3.8 Flash for Literary Translation (#1), Writing (#1), Everyday Translation (#1).
- Choose GPT-6 Astra for Computer & Browser Use (#2), Grounded RAG (#2), RAG & Long Context (#4).
Built from the published task rankings below; ranks come from each task's own weighted benchmarks, so a win on one task says nothing about another.
Measured head to head
Benchmarks both models were run on
| Evaluation | Gemini 3.8 Flash | GPT-6 Astra | Source |
|---|---|---|---|
| FACTS Grounding | 73.1% | 82% | source · 2026-09-03 |
| FrontierMath Tiers 1-3 (Epoch AI) | 68.4% ± 2.8 | 93.7% ± 1.4 | source · 2026-09-02 |
| GPQA Diamond (Epoch AI) | 95.4% ± 1.4 | 95.8% ± 1.4 | source · 2026-09-02 |
| LiveBench Agentic Coding | 54.2% | 57.3% | source · 2026-10-18 |
| LiveBench Coding | 72.5% | 80.4% | source · 2026-10-18 |
| LiveBench Data Analysis | 54.0% | 83.0% | source · 2026-10-18 |
| LiveBench Instruction Following | 81.4% | 75.6% | source · 2026-10-18 |
| LiveBench Language | 87.8% | 89.4% | source · 2026-10-18 |
| LiveBench Math | 91.6% | 96.8% | source · 2026-10-18 |
| LiveBench Reasoning | 89.3% | 92.7% | source · 2026-10-18 |
| LMArena Agent | 3.7 | 15.1 | source · 2026-10-19 |
| LMArena Agent Bash Recovery | -0.7 | 5.5 | source · 2026-10-08 |
| LMArena Agent Steerability | 1.4 | 15.5 | source · 2026-10-19 |
| LMArena Agent Task Outcome | 4 | 12.8 | source · 2026-10-19 |
| LMArena Agent Tool Hallucination | 0.6 | 0.7 | source · 2026-10-19 |
| LMArena Creative Writing | 1492 Elo | 1421 Elo | source · 2026-10-15 |
| LMArena Instruction Following | 1491 Elo | 1455 Elo | source · 2026-10-15 |
| LMArena Long Query | 1507 Elo | 1461 Elo | source · 2026-10-15 |
| LMArena Math | 1527 Elo | 1465 Elo | source · 2026-10-15 |
| LMArena Text | 1496 Elo | 1477 Elo | source · 2026-10-15 |
| LMArena Text Factuality | 1474 Elo | 1466 Elo | source · 2026-10-15 |
| LMArena Vision | 1291 Elo | 1285 Elo | source · 2026-10-19 |
| LMArena Vision Diagrams | 1333 Elo | 1310 Elo | source · 2026-10-19 |
| LMArena Vision OCR | 1316 Elo | 1299 Elo | source · 2026-10-19 |
| LMArena WebDev | 1585 Elo | 1774 Elo | source · 2026-10-19 |
| LMArena WebDev Image-to-Web | 1593 Elo | 1726 Elo | source · 2026-10-19 |
| OTIS Mock AIME (Epoch AI) | 98.9% ± 0.9 | 100% ± 0 | source · 2026-09-02 |
| SimpleQA Verified (Epoch AI) | 69.7% ± 1.5 | 75.6% ± 1.4 | source · 2026-09-02 |
| Terminal-Bench (4.0) | 19.1% | 58.2% | source · 2026-10-20 |
Values are as published by each evaluator, in its own units; rows from different evaluators are not on a common scale.
task evidence
How they place when the question changes
Lower ranks are better. “Best” marks the strongest option in this shortlist for that task.