Model comparison
Gemini 3.1 Flash Lite vs GPT-6 Luna
GPT-6 Luna is the stronger model overall, scoring 53.3 to 40.8 on the Noometry Index.
Last verified . 30 shared benchmarks.
GoogleSummary
- They share 30 benchmarks with published results for both. Gemini 3.1 Flash Lite scores higher in 2 categories and GPT-6 Luna in 8 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in math, where GPT-6 Luna leads 76.1 to 40.7.
- The biggest single-benchmark swing is NYT Connections (extended): 8.2% for Gemini 3.1 Flash Lite and 68.7% for GPT-6 Luna.
- GPT-6 Luna is cheaper at $0.10 / $0.50 per million input/output tokens, against $0.25 / $1.50 for Gemini 3.1 Flash Lite.
- GPT-6 Luna accepts more context: 1.05M tokens versus 1.05M.
Side by side
| Gemini 3.1 Flash Lite | GPT-6 Luna | |
|---|---|---|
| Provider | OpenAI | |
| Noometry Index | 40.8 | 53.3 |
| Released | 2026-03-03 | 2026-09-22 |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | 1.05M |
| Max output | 66K | 128K |
| Input $ / M tokens | $0.25 | $0.10 |
| Output $ / M tokens | $1.50 | $0.50 |
| Results tracked | 38 | 42 |
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Category by category
Coding GPT-6 Luna leads
Gemini 3.1 Flash Lite: 37.8 (#188), GPT-6 Luna: 55.5 (#25)
| Benchmark | Gemini 3.1 Flash Lite | GPT-6 Luna |
|---|---|---|
| LMArena WebDev | 1256 | 1581 |
| SciCode | 41.9% | 54.6% |
| LMArena Coding | 1400 | 1439 |
| ALE-Bench | 797.73 | 1,577 |
| DeepSWE | — | 66.6% |
| FrontierCode | — | 42.4% |
| WeirdML | 52.2% | — |
Agentic & Tool Use GPT-6 Luna leads
Gemini 3.1 Flash Lite: 30.2 (#79), GPT-6 Luna: 33.3 (#54)
| Benchmark | Gemini 3.1 Flash Lite | GPT-6 Luna |
|---|---|---|
| APEX-Agents | — | 44.3% |
| DeepResearch Bench | 37.3% | — |
| GDP.pdf | — | 23% |
Reasoning GPT-6 Luna leads
Gemini 3.1 Flash Lite: 22.9 (#186), GPT-6 Luna: 48.2 (#41)
| Benchmark | Gemini 3.1 Flash Lite | GPT-6 Luna |
|---|---|---|
| NYT Connections (extended) | 8.2% | 68.7% |
| CritPt | 1.1% | 19.4% |
| Chess Puzzles | 25% | 31% |
| LMArena Hard Prompts | 1407 | 1411 |
| DTBench | 76.8% | 90.1% |
| LMCA | 35% | 44.5% |
| Epoch Capabilities Index | 144.47 | 156.28 |
| ARC-AGI-2 | — | 59.3% |
| Kagi LLM Benchmark | 67.2% | — |
| ARC-AGI-1 | — | 86.7% |
| EnigmaEval | 3% | — |
| Thematic Generalization | 63.3% | — |
| Mystery Game Puzzles | — | 7% |
| ForecastBench | 54.4 | — |
Math GPT-6 Luna leads
Gemini 3.1 Flash Lite: 40.7 (#90), GPT-6 Luna: 76.1 (#15)
| Benchmark | Gemini 3.1 Flash Lite | GPT-6 Luna |
|---|---|---|
| FrontierMath (Tiers 1-3) | 27.7% | 78.9% |
| OTIS Mock AIME 2024-2025 | 80% | 98.9% |
| LMArena Math | 1428 | 1416 |
| FrontierMath Tier 4 | — | 56.1% |
| ProofBench | — | 64% |
Knowledge GPT-6 Luna leads
Gemini 3.1 Flash Lite: 41.9 (#104), GPT-6 Luna: 57.0 (#41)
| Benchmark | Gemini 3.1 Flash Lite | GPT-6 Luna |
|---|---|---|
| GPQA Diamond | 81.8% | 90.5% |
| LMArena Expert | 1398 | 1444 |
| Humanity's Last Exam | 8.6% | — |
| SimpleQA Verified | — | 41.4% |
| Vectara Hallucination Rate | 8.2% | — |
Multimodal GPT-6 Luna leads
Gemini 3.1 Flash Lite: 39.4 (#60), GPT-6 Luna: 42.4 (#30)
| Benchmark | Gemini 3.1 Flash Lite | GPT-6 Luna |
|---|---|---|
| LMArena Vision | 1240 | 1217 |
| Blueprint-Bench 2 | — | 31.2% |
| Furniture Assembly | — | 44.2% |
Multilingual Gemini 3.1 Flash Lite leads
Gemini 3.1 Flash Lite: 52.3 (#86), GPT-6 Luna: 50.5 (#117)
| Benchmark | Gemini 3.1 Flash Lite | GPT-6 Luna |
|---|---|---|
| LMArena Non-English | 1411 | 1386 |
| LMArena Chinese | 1461 | 1433 |
| LMArena French | 1424 | 1420 |
| LMArena German | 1429 | 1369 |
| LMArena Japanese | 1413 | 1369 |
| LMArena Korean | 1392 | 1360 |
| LMArena Russian | 1420 | 1394 |
| LMArena Spanish | 1421 | 1393 |
Instruction Following GPT-6 Luna leads
Gemini 3.1 Flash Lite: 72.7 (#131), GPT-6 Luna: 74.3 (#99)
| Benchmark | Gemini 3.1 Flash Lite | GPT-6 Luna |
|---|---|---|
| LMArena Instruction Following | 1377 | 1409 |
Long Context Too close to call
Gemini 3.1 Flash Lite: 42.5 (#122), GPT-6 Luna: 43.0 (#111)
| Benchmark | Gemini 3.1 Flash Lite | GPT-6 Luna |
|---|---|---|
| LMArena Longer Query | 1394 | 1409 |
Writing & Preference Gemini 3.1 Flash Lite leads
Gemini 3.1 Flash Lite: 60.9 (#94), GPT-6 Luna: 58.3 (#119)
| Benchmark | Gemini 3.1 Flash Lite | GPT-6 Luna |
|---|---|---|
| LMArena Text | 1416 | 1391 |
| LMArena Creative Writing | 1401 | 1363 |
| LMArena Multi-Turn | 1417 | 1396 |
Frequently asked questions
Is Gemini 3.1 Flash Lite better than GPT-6 Luna?
GPT-6 Luna is the stronger model overall, scoring 53.3 to 40.8 on the Noometry Index.
Which is cheaper, Gemini 3.1 Flash Lite or GPT-6 Luna?
GPT-6 Luna is cheaper. It lists at $0.10 per million input tokens and $0.50 per million output tokens; Gemini 3.1 Flash Lite lists at $0.25 and $1.50.
Is Gemini 3.1 Flash Lite or GPT-6 Luna better for coding?
GPT-6 Luna scores higher on coding benchmarks: 55.5 versus 37.8 in the Noometry coding category.
Which has the bigger context window?
GPT-6 Luna does, with 1.05M tokens against 1.05M.
How many benchmarks do Gemini 3.1 Flash Lite and GPT-6 Luna share?
30 benchmarks have published results for both models. Gemini 3.1 Flash Lite has 38 scored results on Noometry and GPT-6 Luna has 42.