Model comparison
GPT-5.4 Pro vs GPT-5.5 Instant
GPT-5.4 Pro is the stronger model overall, scoring 58.9 to 42.7 on the Noometry Index.
Last verified . 6 shared benchmarks.
Summary
- They share 6 benchmarks with published results for both. GPT-5.4 Pro scores higher in 3 categories and GPT-5.5 Instant in 1 category; 4 gaps are clear of the uncertainty.
- The widest gap is in math, where GPT-5.4 Pro leads 72.4 to 26.5.
- The biggest single-benchmark swing is FrontierMath (Tiers 1-3): 82.5% for GPT-5.4 Pro and 26.3% for GPT-5.5 Instant.
Side by side
| GPT-5.4 Pro | GPT-5.5 Instant | |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Noometry Index | 58.9 | 42.7 |
| Released | 2026-03-05 | 2026-05-05 |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | — |
| Max output | 128K | — |
| Input $ / M tokens | $30 | — |
| Output $ / M tokens | $180 | — |
| Results tracked | 16 | 27 |
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Category by category
Coding GPT-5.5 Instant leads
GPT-5.4 Pro: 43.2 (#90), GPT-5.5 Instant: 44.3 (#74)
| Benchmark | GPT-5.4 Pro | GPT-5.5 Instant |
|---|---|---|
| SciCode | — | 48.6% |
| WeirdML | 57.4% | — |
| LMArena Coding | — | 1433 |
Reasoning GPT-5.4 Pro leads
GPT-5.4 Pro: 70.7 (#13), GPT-5.5 Instant: 24.9 (#155)
| Benchmark | GPT-5.4 Pro | GPT-5.5 Instant |
|---|---|---|
| CritPt | 30% | 0% |
| Chess Puzzles | 58.6% | 12% |
| Epoch Capabilities Index | 158.93 | 142.52 |
| ARC-AGI-2 | 83.3% | — |
| SimpleBench | 74.1% | — |
| ARC-AGI-1 | 94.5% | — |
| EnigmaEval | 23.8% | — |
| LMArena Hard Prompts | — | 1426 |
Math GPT-5.4 Pro leads
GPT-5.4 Pro: 72.4 (#22), GPT-5.5 Instant: 26.5 (#259)
| Benchmark | GPT-5.4 Pro | GPT-5.5 Instant |
|---|---|---|
| FrontierMath (Tiers 1-3) | 82.5% | 26.3% |
| FrontierMath Tier 4 | 58.5% | 2.4% |
| OTIS Mock AIME 2024-2025 | — | 68.1% |
| LMArena Math | — | 1420 |
| FrontierMath (Feb 2025 set) | 50% | — |
| FrontierMath Tier 4 (v1) | 37.5% | — |
Knowledge GPT-5.4 Pro leads
GPT-5.4 Pro: 68.3 (#7), GPT-5.5 Instant: 48.9 (#74)
| Benchmark | GPT-5.4 Pro | GPT-5.5 Instant |
|---|---|---|
| GPQA Diamond | 94.6% | 82.5% |
| Humanity's Last Exam | 44.3% | — |
| SimpleQA Verified | 46.3% | — |
| Vectara Hallucination Rate | 8.3% | — |
| LMArena Expert | — | 1409 |
Multimodal Not comparable
GPT-5.4 Pro: —, GPT-5.5 Instant: 40.0 (#52)
| Benchmark | GPT-5.4 Pro | GPT-5.5 Instant |
|---|---|---|
| LMArena Vision | — | 1250 |
| LMArena Document | — | 1403 |
Multilingual Not comparable
GPT-5.4 Pro: —, GPT-5.5 Instant: 52.8 (#80)
| Benchmark | GPT-5.4 Pro | GPT-5.5 Instant |
|---|---|---|
| LMArena Non-English | — | 1417 |
| LMArena Chinese | — | 1456 |
| LMArena French | — | 1428 |
| LMArena German | — | 1411 |
| LMArena Japanese | — | 1408 |
| LMArena Korean | — | 1392 |
| LMArena Russian | — | 1431 |
| LMArena Spanish | — | 1429 |
Instruction Following Not comparable
GPT-5.4 Pro: —, GPT-5.5 Instant: 74.2 (#100)
| Benchmark | GPT-5.4 Pro | GPT-5.5 Instant |
|---|---|---|
| LMArena Instruction Following | — | 1406 |
Long Context Not comparable
GPT-5.4 Pro: —, GPT-5.5 Instant: 43.4 (#96)
| Benchmark | GPT-5.4 Pro | GPT-5.5 Instant |
|---|---|---|
| LMArena Longer Query | — | 1422 |
Writing & Preference Not comparable
GPT-5.4 Pro: —, GPT-5.5 Instant: 61.8 (#85)
| Benchmark | GPT-5.4 Pro | GPT-5.5 Instant |
|---|---|---|
| LMArena Text | — | 1419 |
| LMArena Creative Writing | — | 1419 |
| LMArena Multi-Turn | — | 1433 |
Frequently asked questions
Is GPT-5.4 Pro better than GPT-5.5 Instant?
GPT-5.4 Pro is the stronger model overall, scoring 58.9 to 42.7 on the Noometry Index.
Is GPT-5.4 Pro or GPT-5.5 Instant better for coding?
GPT-5.5 Instant scores higher on coding benchmarks: 44.3 versus 43.2 in the Noometry coding category.
How many benchmarks do GPT-5.4 Pro and GPT-5.5 Instant share?
6 benchmarks have published results for both models. GPT-5.4 Pro has 16 scored results on Noometry and GPT-5.5 Instant has 27.