Model comparison
Gemini 3 Flash Preview vs GPT-5.5 Instant
Gemini 3 Flash Preview is the stronger model overall, scoring 52.3 to 42.7 on the Noometry Index.
Last verified . 25 shared benchmarks.
GoogleSummary
- They share 25 benchmarks with published results for both. Gemini 3 Flash Preview scores higher in 9 categories and GPT-5.5 Instant in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in math, where Gemini 3 Flash Preview leads 51.7 to 26.5.
- The biggest single-benchmark swing is Chess Puzzles: 40% for Gemini 3 Flash Preview and 12% for GPT-5.5 Instant.
Side by side
| Gemini 3 Flash Preview | GPT-5.5 Instant | |
|---|---|---|
| Provider | OpenAI | |
| Noometry Index | 52.3 | 42.7 |
| Released | 2025-12-17 | 2026-05-05 |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | — |
| Max output | 66K | — |
| Input $ / M tokens | $0.50 | — |
| Output $ / M tokens | $3 | — |
| Results tracked | 59 | 27 |
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Category by category
Coding Gemini 3 Flash Preview leads
Gemini 3 Flash Preview: 50.9 (#42), GPT-5.5 Instant: 44.3 (#74)
| Benchmark | Gemini 3 Flash Preview | GPT-5.5 Instant |
|---|---|---|
| LMArena Coding | 1460 | 1433 |
| SWE-bench Verified | 75.4% | — |
| SWE-bench Verified (bash only) | 75.8% | — |
| LMArena WebDev | 1439 | — |
| SWE-bench Multilingual | 72.7% | — |
| SciCode | — | 48.6% |
| GSO | 9.8% | — |
| WeirdML | 61.6% | — |
| ALE-Bench | 1,367 | — |
Agentic & Tool Use Not comparable
Gemini 3 Flash Preview: 38.7 (#29), GPT-5.5 Instant: —
| Benchmark | Gemini 3 Flash Preview | GPT-5.5 Instant |
|---|---|---|
| Terminal-Bench | 64.3% | — |
| τ²-bench Airline | 82.5% | — |
| τ²-bench Banking | 27.3% | — |
| τ²-bench Retail | 76.8% | — |
| τ²-bench Telecom | 91.2% | — |
| DeepResearch Bench | 49.8% | — |
| BALROG | 48.1% | — |
| GDP.pdf | 10% | — |
| LMArena Search | 1198 | — |
| Vending-Bench 2 | 3,635 | — |
Reasoning Gemini 3 Flash Preview leads
Gemini 3 Flash Preview: 49.2 (#37), GPT-5.5 Instant: 24.9 (#155)
| Benchmark | Gemini 3 Flash Preview | GPT-5.5 Instant |
|---|---|---|
| Chess Puzzles | 40% | 12% |
| LMArena Hard Prompts | 1465 | 1426 |
| Epoch Capabilities Index | 151.8 | 142.52 |
| ARC-AGI-2 | 33.6% | — |
| SimpleBench | 61.1% | — |
| NYT Connections (extended) | 83.1% | — |
| ARC-AGI-1 | 84.7% | — |
| CritPt | — | 0% |
| Mystery Game Puzzles | 26% | — |
| DTBench | 89.1% | — |
| LMCA | 43.1% | — |
| ForecastBench | 58.5 | — |
Math Gemini 3 Flash Preview leads
Gemini 3 Flash Preview: 51.7 (#55), GPT-5.5 Instant: 26.5 (#259)
| Benchmark | Gemini 3 Flash Preview | GPT-5.5 Instant |
|---|---|---|
| FrontierMath (Tiers 1-3) | 51.2% | 26.3% |
| FrontierMath Tier 4 | 17.1% | 2.4% |
| OTIS Mock AIME 2024-2025 | 95.6% | 68.1% |
| LMArena Math | 1473 | 1420 |
| MathArena Final-Answer Competitions | 67.6% | — |
| ProofBench | 15% | — |
| FrontierMath (Feb 2025 set) | 35.6% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |
Knowledge Gemini 3 Flash Preview leads
Gemini 3 Flash Preview: 58.8 (#33), GPT-5.5 Instant: 48.9 (#74)
| Benchmark | Gemini 3 Flash Preview | GPT-5.5 Instant |
|---|---|---|
| GPQA Diamond | 89.4% | 82.5% |
| LMArena Expert | 1462 | 1409 |
| SimpleQA Verified | 66.8% | — |
| Vectara Hallucination Rate | 13.5% | — |
Multimodal Gemini 3 Flash Preview leads
Gemini 3 Flash Preview: 45.5 (#16), GPT-5.5 Instant: 40.0 (#52)
| Benchmark | Gemini 3 Flash Preview | GPT-5.5 Instant |
|---|---|---|
| LMArena Vision | 1285 | 1250 |
| LMArena Document | 1413 | 1403 |
| GeoBench | 88% | — |
| VPCT | 72.6% | — |
| Blueprint-Bench 2 | 0% | — |
Multilingual Gemini 3 Flash Preview leads
Gemini 3 Flash Preview: 55.7 (#27), GPT-5.5 Instant: 52.8 (#80)
| Benchmark | Gemini 3 Flash Preview | GPT-5.5 Instant |
|---|---|---|
| LMArena Non-English | 1458 | 1417 |
| LMArena Chinese | 1511 | 1456 |
| LMArena French | 1477 | 1428 |
| LMArena German | 1497 | 1411 |
| LMArena Japanese | 1489 | 1408 |
| LMArena Korean | 1443 | 1392 |
| LMArena Russian | 1480 | 1431 |
| LMArena Spanish | 1469 | 1429 |
Instruction Following Gemini 3 Flash Preview leads
Gemini 3 Flash Preview: 75.7 (#56), GPT-5.5 Instant: 74.2 (#100)
| Benchmark | Gemini 3 Flash Preview | GPT-5.5 Instant |
|---|---|---|
| LMArena Instruction Following | 1437 | 1406 |
Long Context Too close to call
Gemini 3 Flash Preview: 44.4 (#67), GPT-5.5 Instant: 43.4 (#96)
| Benchmark | Gemini 3 Flash Preview | GPT-5.5 Instant |
|---|---|---|
| LMArena Longer Query | 1452 | 1422 |
Writing & Preference Gemini 3 Flash Preview leads
Gemini 3 Flash Preview: 65.5 (#45), GPT-5.5 Instant: 61.8 (#85)
| Benchmark | Gemini 3 Flash Preview | GPT-5.5 Instant |
|---|---|---|
| LMArena Text | 1466 | 1419 |
| LMArena Creative Writing | 1457 | 1419 |
| LMArena Multi-Turn | 1471 | 1433 |
Frequently asked questions
Is Gemini 3 Flash Preview better than GPT-5.5 Instant?
Gemini 3 Flash Preview is the stronger model overall, scoring 52.3 to 42.7 on the Noometry Index.
Is Gemini 3 Flash Preview or GPT-5.5 Instant better for coding?
Gemini 3 Flash Preview scores higher on coding benchmarks: 50.9 versus 44.3 in the Noometry coding category.
How many benchmarks do Gemini 3 Flash Preview and GPT-5.5 Instant share?
25 benchmarks have published results for both models. Gemini 3 Flash Preview has 59 scored results on Noometry and GPT-5.5 Instant has 27.