Model comparison
Gemini 1.5 Flash (May 2024) vs GPT-5.5 Pro
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 33.2 on the Noometry Index.
Last verified . 5 shared benchmarks.
GoogleSummary
- They share 5 benchmarks with published results for both. Gemini 1.5 Flash (May 2024) scores higher in 0 categories and GPT-5.5 Pro in 3 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in math, where GPT-5.5 Pro leads 84.0 to 22.1.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 16.3% for Gemini 1.5 Flash (May 2024) and 100% for GPT-5.5 Pro.
Side by side
| Gemini 1.5 Flash (May 2024) | GPT-5.5 Pro | |
|---|---|---|
| Provider | OpenAI | |
| Noometry Index | 33.2 | 64.3 |
| Released | 2024-05-14 | 2026-04-23 |
| Weights | Proprietary | Proprietary |
| Context window | — | 1.05M |
| Max output | — | 128K |
| Input $ / M tokens | — | $30 |
| Output $ / M tokens | — | $180 |
| Results tracked | 42 | 14 |
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Category by category
Coding Not comparable
Gemini 1.5 Flash (May 2024): 34.4 (#236), GPT-5.5 Pro: —
| Benchmark | Gemini 1.5 Flash (May 2024) | GPT-5.5 Pro |
|---|---|---|
| WeirdML | 24.9% | — |
| BigCodeBench Instruct | 43.5% | — |
| LMArena Coding | 1261 | — |
| BigCodeBench Complete | 55.1% | — |
| HumanEval+ | 75.6% | — |
| MBPP+ | 67.5% | — |
Agentic & Tool Use Not comparable
Gemini 1.5 Flash (May 2024): 26.6 (#102), GPT-5.5 Pro: —
| Benchmark | Gemini 1.5 Flash (May 2024) | GPT-5.5 Pro |
|---|---|---|
| BALROG | 14.6% | — |
Reasoning GPT-5.5 Pro leads
Gemini 1.5 Flash (May 2024): 21.7 (#215), GPT-5.5 Pro: 73.3 (#10)
| Benchmark | Gemini 1.5 Flash (May 2024) | GPT-5.5 Pro |
|---|---|---|
| DTBench | 53.8% | 96% |
| Epoch Capabilities Index | 129.36 | 162.07 |
| ARC-AGI-2 | — | 84.6% |
| SimpleBench | — | 76.9% |
| ARC-AGI-1 | — | 96.5% |
| CritPt | — | 30.6% |
| Chess Puzzles | — | 64% |
| LMArena Hard Prompts | 1257 | — |
| LMCA | — | 53.9% |
| ForecastBench | 53.9 | — |
| PIQA | 87.5% | — |
Math GPT-5.5 Pro leads
Gemini 1.5 Flash (May 2024): 22.1 (#281), GPT-5.5 Pro: 84.0 (#10)
| Benchmark | Gemini 1.5 Flash (May 2024) | GPT-5.5 Pro |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 16.3% | 100% |
| FrontierMath (Feb 2025 set) | 0% | 52.4% |
| FrontierMath (Tiers 1-3) | — | 87.7% |
| FrontierMath Tier 4 | — | 78% |
| Omni-MATH | 30.4% | — |
| LMArena Math | 1269 | — |
| MATH Level 5 | 61.9% | — |
| FrontierMath Tier 4 (v1) | — | 39.6% |
| GSM8K | 82.4% | — |
Knowledge GPT-5.5 Pro leads
Gemini 1.5 Flash (May 2024): 26.2 (#260), GPT-5.5 Pro: 64.1 (#19)
| Benchmark | Gemini 1.5 Flash (May 2024) | GPT-5.5 Pro |
|---|---|---|
| GPQA Diamond | 47.3% | 93.9% |
| MMLU-Pro | 67.8% | — |
| GPQA (HELM) | 43.7% | — |
| LMArena Expert | 1233 | — |
| BoolQ | 85.8% | — |
| MMLU | 77.9% | — |
Multimodal Not comparable
Gemini 1.5 Flash (May 2024): 36.0 (#81), GPT-5.5 Pro: —
| Benchmark | Gemini 1.5 Flash (May 2024) | GPT-5.5 Pro |
|---|---|---|
| LMArena Vision | 1141 | — |
| Video-MME | 70.3% | — |
| GeoBench | 76% | — |
Multilingual Not comparable
Gemini 1.5 Flash (May 2024): 42.9 (#189), GPT-5.5 Pro: —
| Benchmark | Gemini 1.5 Flash (May 2024) | GPT-5.5 Pro |
|---|---|---|
| LMArena Non-English | 1278 | — |
| LMArena Chinese | 1295 | — |
| LMArena French | 1258 | — |
| LMArena German | 1262 | — |
| LMArena Japanese | 1252 | — |
| LMArena Korean | 1221 | — |
| LMArena Russian | 1288 | — |
| LMArena Spanish | 1243 | — |
Instruction Following Not comparable
Gemini 1.5 Flash (May 2024): 66.8 (#205), GPT-5.5 Pro: —
| Benchmark | Gemini 1.5 Flash (May 2024) | GPT-5.5 Pro |
|---|---|---|
| IFEval | 83.1% | — |
| LMArena Instruction Following | 1258 | — |
Long Context Not comparable
Gemini 1.5 Flash (May 2024): 39.0 (#187), GPT-5.5 Pro: —
| Benchmark | Gemini 1.5 Flash (May 2024) | GPT-5.5 Pro |
|---|---|---|
| LMArena Longer Query | 1284 | — |
Writing & Preference Not comparable
Gemini 1.5 Flash (May 2024): 48.7 (#196), GPT-5.5 Pro: —
| Benchmark | Gemini 1.5 Flash (May 2024) | GPT-5.5 Pro |
|---|---|---|
| LMArena Text | 1287 | — |
| LMArena Creative Writing | 1285 | — |
| WildBench | 79.2% | — |
| LMArena Multi-Turn | 1253 | — |
Frequently asked questions
Is Gemini 1.5 Flash (May 2024) better than GPT-5.5 Pro?
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 33.2 on the Noometry Index.
How many benchmarks do Gemini 1.5 Flash (May 2024) and GPT-5.5 Pro share?
5 benchmarks have published results for both models. Gemini 1.5 Flash (May 2024) has 42 scored results on Noometry and GPT-5.5 Pro has 14.