Model comparison
GPT-5.4 vs GPT-5.5 Instant
GPT-5.4 is the stronger model overall, scoring 59.5 to 42.5 on the Noometry Index.
Last verified . 27 shared benchmarks.
Summary
- They share 27 benchmarks with published results for both. GPT-5.4 scores higher in 9 categories and GPT-5.5 Instant in 0 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in math, where GPT-5.4 leads 73.3 to 26.1.
- The biggest single-benchmark swing is FrontierMath (Tiers 1-3): 78.6% for GPT-5.4 and 26.3% for GPT-5.5 Instant.
Side by side
| GPT-5.4 | GPT-5.5 Instant | |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Noometry Index | 59.5 | 42.5 |
| Released | 2026-03-05 | 2026-05-05 |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | — |
| Max output | 128K | — |
| Input $ / M tokens | $2.50 | — |
| Output $ / M tokens | $15 | — |
| Results tracked | 68 | 27 |
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Category by category
Coding GPT-5.4 leads
GPT-5.4: 52.8 (#28), GPT-5.5 Instant: 43.7 (#73)
| Benchmark | GPT-5.4 | GPT-5.5 Instant |
|---|---|---|
| SciCode | 56.6% | 48.6% |
| LMArena Coding | 1497 | 1433 |
| SWE-bench Verified | 76.9% | — |
| DeepSWE | 51.8% | — |
| LMArena WebDev | 1465 | — |
| GSO | 31.4% | — |
| WeirdML | 77.7% | — |
| MirrorCode | 15.6% | — |
| ALE-Bench | 1,607 | — |
| AlgoTune | 1.85 | — |
Agentic & Tool Use Not comparable
GPT-5.4: 46.5 (#12), GPT-5.5 Instant: —
| Benchmark | GPT-5.4 | GPT-5.5 Instant |
|---|---|---|
| Terminal-Bench | 81.8% | — |
| APEX-Agents | 52.4% | — |
| τ²-bench Banking | 39.4% | — |
| DeepResearch Bench | 35.1% | — |
| PostTrainBench | 19% | — |
| GBAEval | 45.1% | — |
| LMArena Search | 1197 | — |
| METR Time Horizons | 74.3% | — |
| Vending-Bench 2 | 6,144 | — |
Reasoning GPT-5.4 leads
GPT-5.4: 61.7 (#17), GPT-5.5 Instant: 24.2 (#149)
| Benchmark | GPT-5.4 | GPT-5.5 Instant |
|---|---|---|
| CritPt | 23.4% | 0% |
| Chess Puzzles | 44% | 12% |
| LMArena Hard Prompts | 1485 | 1426 |
| Epoch Capabilities Index | 156.92 | 142.48 |
| ARC-AGI-2 | 74% | — |
| Kagi LLM Benchmark | 63.8% | — |
| NYT Connections (extended) | 91.3% | — |
| ARC-AGI-1 | 93.7% | — |
| EnigmaEval | 16% | — |
| Thematic Generalization | 80% | — |
| EBR-Bench | 25.4% | — |
| Mystery Game Puzzles | 37% | — |
| DTBench | 94.4% | — |
| LMCA | 52% | — |
| ForecastBench | 59.5 | — |
Math GPT-5.4 leads
GPT-5.4: 73.3 (#14), GPT-5.5 Instant: 26.1 (#241)
| Benchmark | GPT-5.4 | GPT-5.5 Instant |
|---|---|---|
| FrontierMath (Tiers 1-3) | 78.6% | 26.3% |
| FrontierMath Tier 4 | 49% | 2.4% |
| OTIS Mock AIME 2024-2025 | 97.8% | 68.1% |
| LMArena Math | 1488 | 1420 |
| MathArena Final-Answer Competitions | 83.1% | — |
| ProofBench | 56% | — |
| FrontierMath (Feb 2025 set) | 47.6% | — |
| FrontierMath Tier 4 (v1) | 27.1% | — |
Knowledge GPT-5.4 leads
GPT-5.4: 65.3 (#13), GPT-5.5 Instant: 48.9 (#68)
| Benchmark | GPT-5.4 | GPT-5.5 Instant |
|---|---|---|
| GPQA Diamond | 93.3% | 82.5% |
| LMArena Expert | 1507 | 1409 |
| Humanity's Last Exam | 36.2% | — |
| SimpleQA Verified | 45.1% | — |
| Vectara Hallucination Rate | 7% | — |
Multimodal GPT-5.4 leads
GPT-5.4: 43.8 (#19), GPT-5.5 Instant: 39.3 (#48)
| Benchmark | GPT-5.4 | GPT-5.5 Instant |
|---|---|---|
| LMArena Vision | 1302 | 1250 |
| LMArena Document | 1471 | 1403 |
| Blueprint-Bench 2 | 27.1% | — |
| Furniture Assembly | 37.5% | — |
Multilingual GPT-5.4 leads
GPT-5.4: 56.4 (#22), GPT-5.5 Instant: 53.0 (#76)
| Benchmark | GPT-5.4 | GPT-5.5 Instant |
|---|---|---|
| LMArena Non-English | 1465 | 1417 |
| LMArena Chinese | 1520 | 1457 |
| LMArena French | 1493 | 1428 |
| LMArena German | 1472 | 1410 |
| LMArena Japanese | 1484 | 1408 |
| LMArena Korean | 1449 | 1393 |
| LMArena Russian | 1480 | 1430 |
| LMArena Spanish | 1453 | 1430 |
Instruction Following GPT-5.4 leads
GPT-5.4: 77.3 (#25), GPT-5.5 Instant: 74.4 (#94)
| Benchmark | GPT-5.4 | GPT-5.5 Instant |
|---|---|---|
| LMArena Instruction Following | 1469 | 1407 |
Long Context GPT-5.4 leads
GPT-5.4: 50.3 (#8), GPT-5.5 Instant: 43.4 (#92)
| Benchmark | GPT-5.4 | GPT-5.5 Instant |
|---|---|---|
| LMArena Longer Query | 1474 | 1422 |
| CL-bench | 27.9% | — |
| CL-bench Life | 21.7% | — |
Writing & Preference GPT-5.4 leads
GPT-5.4: 72.1 (#18), GPT-5.5 Instant: 62.0 (#81)
| Benchmark | GPT-5.4 | GPT-5.5 Instant |
|---|---|---|
| LMArena Text | 1469 | 1419 |
| LMArena Creative Writing | 1439 | 1420 |
| LMArena Multi-Turn | 1482 | 1434 |
| EQ-Bench Creative Writing | 1840 | — |
| EQ-Bench 4 | 1272 | — |
Frequently asked questions
Is GPT-5.4 better than GPT-5.5 Instant?
GPT-5.4 is the stronger model overall, scoring 59.5 to 42.5 on the Noometry Index.
Is GPT-5.4 or GPT-5.5 Instant better for coding?
GPT-5.4 scores higher on coding benchmarks: 52.8 versus 43.7 in the Noometry coding category.
How many benchmarks do GPT-5.4 and GPT-5.5 Instant share?
27 benchmarks have published results for both models. GPT-5.4 has 68 scored results on Noometry and GPT-5.5 Instant has 27.