Model comparison
Gemini 3.5 Flash vs GPT-5.4
GPT-5.4 is the stronger model overall, scoring 59.4 to 54.2 on the Noometry Index. Gemini 3.5 Flash costs 1.7× less per token, which makes it the better buy when GPT-5.4's lead doesn't matter for your workload.
Last verified . 51 shared benchmarks.
GoogleSummary
- They share 51 benchmarks with published results for both. Gemini 3.5 Flash scores higher in 4 categories and GPT-5.4 in 6 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in agentic & tool use, where GPT-5.4 leads 46.5 to 24.7.
- The biggest single-benchmark swing is GBAEval: 6.7% for Gemini 3.5 Flash and 45.1% for GPT-5.4.
- Gemini 3.5 Flash is cheaper at $1.50 / $9 per million input/output tokens, against $2.50 / $15 for GPT-5.4.
- GPT-5.4 accepts more context: 1.05M tokens versus 1.05M.
Side by side
| Gemini 3.5 Flash | GPT-5.4 | |
|---|---|---|
| Provider | OpenAI | |
| Noometry Index | 54.2 | 59.4 |
| Released | 2026-05-19 | 2026-03-05 |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | 1.05M |
| Max output | 66K | 128K |
| Input $ / M tokens | $1.50 | $2.50 |
| Output $ / M tokens | $9 | $15 |
| Results tracked | 54 | 68 |
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Category by category
Coding GPT-5.4 leads
Gemini 3.5 Flash: 49.4 (#49), GPT-5.4: 52.6 (#33)
| Benchmark | Gemini 3.5 Flash | GPT-5.4 |
|---|---|---|
| SWE-bench Verified | 79.3% | 76.9% |
| DeepSWE | 37.4% | 51.8% |
| LMArena WebDev | 1499 | 1465 |
| SciCode | 53.1% | 56.6% |
| WeirdML | 62.6% | 77.7% |
| LMArena Coding | 1492 | 1497 |
| ALE-Bench | 911.02 | 1,607 |
| GSO | — | 31.4% |
| MirrorCode | — | 15.6% |
| AlgoTune | — | 1.85 |
Agentic & Tool Use GPT-5.4 leads
Gemini 3.5 Flash: 24.7 (#114), GPT-5.4: 46.5 (#13)
| Benchmark | Gemini 3.5 Flash | GPT-5.4 |
|---|---|---|
| APEX-Agents | 27.5% | 52.4% |
| GBAEval | 6.7% | 45.1% |
| Vending-Bench 2 | 5,396 | 6,144 |
| Terminal-Bench | — | 81.8% |
| τ²-bench Banking | — | 39.4% |
| DeepResearch Bench | — | 35.1% |
| PostTrainBench | — | 19% |
| GDP.pdf | 14% | — |
| LMArena Search | — | 1197 |
| METR Time Horizons | — | 74.3% |
Reasoning Gemini 3.5 Flash leads
Gemini 3.5 Flash: 62.8 (#18), GPT-5.4: 61.8 (#19)
| Benchmark | Gemini 3.5 Flash | GPT-5.4 |
|---|---|---|
| ARC-AGI-2 | 72.1% | 74% |
| NYT Connections (extended) | 92.6% | 91.3% |
| ARC-AGI-1 | 92.5% | 93.7% |
| CritPt | 13.1% | 23.4% |
| Chess Puzzles | 50% | 44% |
| EnigmaEval | 25.4% | 16% |
| EBR-Bench | 4.8% | 25.4% |
| LMArena Hard Prompts | 1488 | 1485 |
| Mystery Game Puzzles | 32% | 37% |
| DTBench | 94.7% | 94.4% |
| LMCA | 47.1% | 52% |
| Epoch Capabilities Index | 154.46 | 156.81 |
| ForecastBench | 59 | 59.5 |
| SimpleBench | 76.7% | — |
| Kagi LLM Benchmark | — | 63.8% |
| Thematic Generalization | — | 80% |
| Surface Evolver Bench | 58.1% | — |
Math GPT-5.4 leads
Gemini 3.5 Flash: 60.7 (#36), GPT-5.4: 73.5 (#19)
| Benchmark | Gemini 3.5 Flash | GPT-5.4 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 62.8% | 78.6% |
| FrontierMath Tier 4 | 26.8% | 49% |
| MathArena Final-Answer Competitions | 76.3% | 83.1% |
| OTIS Mock AIME 2024-2025 | 95.6% | 97.8% |
| ProofBench | 31% | 56% |
| LMArena Math | 1504 | 1488 |
| FrontierMath (Feb 2025 set) | 39% | 47.6% |
| FrontierMath Tier 4 (v1) | 14.6% | 27.1% |
Knowledge Too close to call
Gemini 3.5 Flash: 66.3 (#11), GPT-5.4: 65.3 (#14)
| Benchmark | Gemini 3.5 Flash | GPT-5.4 |
|---|---|---|
| GPQA Diamond | 92.8% | 93.3% |
| SimpleQA Verified | 66.2% | 45.1% |
| LMArena Expert | 1495 | 1507 |
| Humanity's Last Exam | — | 36.2% |
| Vectara Hallucination Rate | — | 7% |
Multimodal Gemini 3.5 Flash leads
Gemini 3.5 Flash: 45.7 (#15), GPT-5.4: 43.7 (#20)
| Benchmark | Gemini 3.5 Flash | GPT-5.4 |
|---|---|---|
| LMArena Vision | 1310 | 1303 |
| Blueprint-Bench 2 | 33.6% | 27.1% |
| LMArena Document | 1463 | 1471 |
| Furniture Assembly | — | 37.5% |
Multilingual Too close to call
Gemini 3.5 Flash: 57.0 (#13), GPT-5.4: 56.2 (#23)
| Benchmark | Gemini 3.5 Flash | GPT-5.4 |
|---|---|---|
| LMArena Non-English | 1476 | 1465 |
| LMArena Chinese | 1526 | 1519 |
| LMArena French | 1490 | 1493 |
| LMArena German | 1492 | 1472 |
| LMArena Japanese | 1486 | 1485 |
| LMArena Korean | 1451 | 1448 |
| LMArena Russian | 1493 | 1480 |
| LMArena Spanish | 1480 | 1454 |
Instruction Following Too close to call
Gemini 3.5 Flash: 77.0 (#30), GPT-5.4: 77.1 (#27)
| Benchmark | Gemini 3.5 Flash | GPT-5.4 |
|---|---|---|
| LMArena Instruction Following | 1467 | 1469 |
Long Context GPT-5.4 leads
Gemini 3.5 Flash: 45.4 (#38), GPT-5.4: 50.3 (#8)
| Benchmark | Gemini 3.5 Flash | GPT-5.4 |
|---|---|---|
| LMArena Longer Query | 1482 | 1473 |
| CL-bench | — | 27.9% |
| CL-bench Life | — | 21.7% |
Writing & Preference GPT-5.4 leads
Gemini 3.5 Flash: 65.5 (#47), GPT-5.4: 71.9 (#17)
| Benchmark | Gemini 3.5 Flash | GPT-5.4 |
|---|---|---|
| LMArena Text | 1482 | 1469 |
| LMArena Creative Writing | 1470 | 1439 |
| EQ-Bench 4 | 1087 | 1272 |
| LMArena Multi-Turn | 1481 | 1482 |
| EQ-Bench Creative Writing | — | 1840 |
Frequently asked questions
Is Gemini 3.5 Flash better than GPT-5.4?
GPT-5.4 is the stronger model overall, scoring 59.4 to 54.2 on the Noometry Index. Gemini 3.5 Flash costs 1.7× less per token, which makes it the better buy when GPT-5.4's lead doesn't matter for your workload.
Which is cheaper, Gemini 3.5 Flash or GPT-5.4?
Gemini 3.5 Flash is cheaper. It lists at $1.50 per million input tokens and $9 per million output tokens; GPT-5.4 lists at $2.50 and $15.
Is Gemini 3.5 Flash or GPT-5.4 better for coding?
GPT-5.4 scores higher on coding benchmarks: 52.6 versus 49.4 in the Noometry coding category.
Which has the bigger context window?
GPT-5.4 does, with 1.05M tokens against 1.05M.
How many benchmarks do Gemini 3.5 Flash and GPT-5.4 share?
51 benchmarks have published results for both models. Gemini 3.5 Flash has 54 scored results on Noometry and GPT-5.4 has 68.