Model comparison
GPT-4.1 vs GPT-5.5 Instant
GPT-5.5 Instant is the stronger model overall, scoring 42.5 to 35.7 on the Noometry Index.
Last verified . 23 shared benchmarks.
Summary
- They share 23 benchmarks with published results for both. GPT-4.1 scores higher in 0 categories and GPT-5.5 Instant in 9 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where GPT-5.5 Instant leads 24.2 to 11.7.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 38.3% for GPT-4.1 and 68.1% for GPT-5.5 Instant.
Side by side
| GPT-4.1 | GPT-5.5 Instant | |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Noometry Index | 35.7 | 42.5 |
| Released | 2025-04-14 | 2026-05-05 |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | — |
| Max output | 33K | — |
| Input $ / M tokens | $2 | — |
| Output $ / M tokens | $8 | — |
| Results tracked | 52 | 27 |
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Category by category
Coding GPT-5.5 Instant leads
GPT-4.1: 34.2 (#228), GPT-5.5 Instant: 43.7 (#73)
| Benchmark | GPT-4.1 | GPT-5.5 Instant |
|---|---|---|
| LMArena Coding | 1391 | 1433 |
| SWE-bench Verified | 48.5% | — |
| SWE-bench Verified (bash only) | 39.6% | — |
| Aider Polyglot | 52.4% | — |
| SciCode | — | 48.6% |
| WeirdML | 39% | — |
| CadEval | 42% | — |
| ALE-Bench | 558.1 | — |
Agentic & Tool Use Not comparable
GPT-4.1: 34.4 (#40), GPT-5.5 Instant: —
| Benchmark | GPT-4.1 | GPT-5.5 Instant |
|---|---|---|
| Berkeley Function Calling Leaderboard | 54% | — |
Reasoning GPT-5.5 Instant leads
GPT-4.1: 11.7 (#334), GPT-5.5 Instant: 24.2 (#149)
| Benchmark | GPT-4.1 | GPT-5.5 Instant |
|---|---|---|
| Chess Puzzles | 6% | 12% |
| LMArena Hard Prompts | 1384 | 1426 |
| Epoch Capabilities Index | 136.79 | 142.48 |
| ARC-AGI-2 | 0.4% | — |
| SimpleBench | 27% | — |
| Kagi LLM Benchmark | 52.3% | — |
| ARC-AGI-1 | 5.5% | — |
| CritPt | — | 0% |
| EnigmaEval | 2.2% | — |
| DTBench | 68.3% | — |
| LMCA | 25.6% | — |
| ForecastBench | 61.5 | — |
Math GPT-5.5 Instant leads
GPT-4.1: 21.4 (#269), GPT-5.5 Instant: 26.1 (#241)
| Benchmark | GPT-4.1 | GPT-5.5 Instant |
|---|---|---|
| FrontierMath (Tiers 1-3) | 6% | 26.3% |
| OTIS Mock AIME 2024-2025 | 38.3% | 68.1% |
| LMArena Math | 1369 | 1420 |
| FrontierMath Tier 4 | — | 2.4% |
| Omni-MATH | 47.1% | — |
| MATH Level 5 | 83% | — |
| FrontierMath (Feb 2025 set) | 5.5% | — |
| FrontierMath Tier 4 (v1) | 0% | — |
Knowledge GPT-5.5 Instant leads
GPT-4.1: 37.0 (#152), GPT-5.5 Instant: 48.9 (#68)
| Benchmark | GPT-4.1 | GPT-5.5 Instant |
|---|---|---|
| GPQA Diamond | 66.9% | 82.5% |
| LMArena Expert | 1364 | 1409 |
| Humanity's Last Exam | 5.4% | — |
| SimpleQA Verified | 31.1% | — |
| MMLU-Pro | 81.1% | — |
| Vectara Hallucination Rate | 5.6% | — |
| GPQA (HELM) | 65.9% | — |
Multimodal GPT-5.5 Instant leads
GPT-4.1: 37.5 (#66), GPT-5.5 Instant: 39.3 (#48)
| Benchmark | GPT-4.1 | GPT-5.5 Instant |
|---|---|---|
| LMArena Vision | 1210 | 1250 |
| GeoBench | 72% | — |
| LMArena Document | — | 1403 |
Multilingual GPT-5.5 Instant leads
GPT-4.1: 49.6 (#128), GPT-5.5 Instant: 53.0 (#76)
| Benchmark | GPT-4.1 | GPT-5.5 Instant |
|---|---|---|
| LMArena Non-English | 1370 | 1417 |
| LMArena Chinese | 1382 | 1457 |
| LMArena French | 1383 | 1428 |
| LMArena German | 1380 | 1410 |
| LMArena Japanese | 1320 | 1408 |
| LMArena Korean | 1339 | 1393 |
| LMArena Russian | 1377 | 1430 |
| LMArena Spanish | 1375 | 1430 |
Instruction Following GPT-5.5 Instant leads
GPT-4.1: 71.5 (#148), GPT-5.5 Instant: 74.4 (#94)
| Benchmark | GPT-4.1 | GPT-5.5 Instant |
|---|---|---|
| LMArena Instruction Following | 1367 | 1407 |
| IFEval | 83.8% | — |
Long Context GPT-5.5 Instant leads
GPT-4.1: 40.0 (#158), GPT-5.5 Instant: 43.4 (#92)
| Benchmark | GPT-4.1 | GPT-5.5 Instant |
|---|---|---|
| LMArena Longer Query | 1385 | 1422 |
| Fiction.LiveBench | 63.9% | — |
Writing & Preference GPT-5.5 Instant leads
GPT-4.1: 57.8 (#120), GPT-5.5 Instant: 62.0 (#81)
| Benchmark | GPT-4.1 | GPT-5.5 Instant |
|---|---|---|
| LMArena Text | 1383 | 1419 |
| LMArena Creative Writing | 1363 | 1420 |
| LMArena Multi-Turn | 1398 | 1434 |
| EQ-Bench Creative Writing | 1420 | — |
| WildBench | 85.4% | — |
Frequently asked questions
Is GPT-4.1 better than GPT-5.5 Instant?
GPT-5.5 Instant is the stronger model overall, scoring 42.5 to 35.7 on the Noometry Index.
Is GPT-4.1 or GPT-5.5 Instant better for coding?
GPT-5.5 Instant scores higher on coding benchmarks: 43.7 versus 34.2 in the Noometry coding category.
How many benchmarks do GPT-4.1 and GPT-5.5 Instant share?
23 benchmarks have published results for both models. GPT-4.1 has 52 scored results on Noometry and GPT-5.5 Instant has 27.