Model comparison
GPT-5.5 Instant vs GPT-5 Mini
GPT-5.5 Instant and GPT-5 Mini score almost the same on the Noometry Index (42.5 vs 41.7), so choose on price, context window or the category you care about most.
Last verified . 26 shared benchmarks.
Summary
- They share 26 benchmarks with published results for both. GPT-5.5 Instant scores higher in 7 categories and GPT-5 Mini in 2 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in math, where GPT-5 Mini leads 46.3 to 26.1.
- The biggest single-benchmark swing is FrontierMath (Tiers 1-3): 26.3% for GPT-5.5 Instant and 46.7% for GPT-5 Mini.
Side by side
| GPT-5.5 Instant | GPT-5 Mini | |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Noometry Index | 42.5 | 41.7 |
| Released | 2026-05-05 | 2025-08-07 |
| Weights | Proprietary | Proprietary |
| Context window | — | 400K |
| Max output | — | 128K |
| Input $ / M tokens | — | $0.25 |
| Output $ / M tokens | — | $2 |
| Results tracked | 27 | 60 |
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Category by category
Coding GPT-5.5 Instant leads
GPT-5.5 Instant: 43.7 (#73), GPT-5 Mini: 40.0 (#134)
| Benchmark | GPT-5.5 Instant | GPT-5 Mini |
|---|---|---|
| SciCode | 48.6% | 39.2% |
| LMArena Coding | 1433 | 1406 |
| SWE-bench Verified | — | 64.7% |
| SWE-bench Verified (bash only) | — | 59.8% |
| SWE-bench Multilingual | — | 39.7% |
| WeirdML | — | 52.7% |
| ALE-Bench | — | 799.77 |
| AlgoTune | — | 1.38 |
Agentic & Tool Use Not comparable
GPT-5.5 Instant: —, GPT-5 Mini: 31.0 (#64)
| Benchmark | GPT-5.5 Instant | GPT-5 Mini |
|---|---|---|
| Terminal-Bench | — | 34.8% |
| Berkeley Function Calling Leaderboard | — | 55.5% |
| Vending-Bench 2 | — | -31.18 |
Reasoning Too close to call
GPT-5.5 Instant: 24.2 (#149), GPT-5 Mini: 24.1 (#153)
| Benchmark | GPT-5.5 Instant | GPT-5 Mini |
|---|---|---|
| CritPt | 0% | 0% |
| Chess Puzzles | 12% | 30% |
| LMArena Hard Prompts | 1426 | 1380 |
| Epoch Capabilities Index | 142.48 | 145.51 |
| ARC-AGI-2 | — | 4.4% |
| Kagi LLM Benchmark | — | 70.3% |
| ARC-AGI-1 | — | 54.3% |
| EnigmaEval | — | 8.2% |
| Mystery Game Puzzles | — | 10% |
| DTBench | — | 80.5% |
| LMCA | — | 34.2% |
| ForecastBench | — | 61 |
Math GPT-5 Mini leads
GPT-5.5 Instant: 26.1 (#241), GPT-5 Mini: 46.3 (#59)
| Benchmark | GPT-5.5 Instant | GPT-5 Mini |
|---|---|---|
| FrontierMath (Tiers 1-3) | 26.3% | 46.7% |
| FrontierMath Tier 4 | 2.4% | 12.2% |
| OTIS Mock AIME 2024-2025 | 68.1% | 86.7% |
| LMArena Math | 1420 | 1377 |
| ProofBench | — | 9% |
| Omni-MATH | — | 72.2% |
| MATH Level 5 | — | 97.8% |
| FrontierMath (Feb 2025 set) | — | 27.2% |
| FrontierMath Tier 4 (v1) | — | 6.3% |
Knowledge GPT-5.5 Instant leads
GPT-5.5 Instant: 48.9 (#68), GPT-5 Mini: 45.5 (#80)
| Benchmark | GPT-5.5 Instant | GPT-5 Mini |
|---|---|---|
| GPQA Diamond | 82.5% | 75% |
| LMArena Expert | 1409 | 1377 |
| Humanity's Last Exam | — | 19.4% |
| SimpleQA Verified | — | 21.6% |
| MMLU-Pro | — | 83.5% |
| Confabulations | — | 13.3% |
| Vectara Hallucination Rate | — | 12.9% |
| GPQA (HELM) | — | 75.6% |
Multimodal GPT-5.5 Instant leads
GPT-5.5 Instant: 39.3 (#48), GPT-5 Mini: 35.0 (#80)
| Benchmark | GPT-5.5 Instant | GPT-5 Mini |
|---|---|---|
| LMArena Vision | 1250 | 1202 |
| VPCT | — | 40.2% |
| LMArena Document | 1403 | — |
Multilingual GPT-5.5 Instant leads
GPT-5.5 Instant: 53.0 (#76), GPT-5 Mini: 49.1 (#131)
| Benchmark | GPT-5.5 Instant | GPT-5 Mini |
|---|---|---|
| LMArena Non-English | 1417 | 1363 |
| LMArena Chinese | 1457 | 1387 |
| LMArena French | 1428 | 1385 |
| LMArena German | 1410 | 1366 |
| LMArena Japanese | 1408 | 1342 |
| LMArena Korean | 1393 | 1306 |
| LMArena Russian | 1430 | 1362 |
| LMArena Spanish | 1430 | 1355 |
Instruction Following GPT-5 Mini leads
GPT-5.5 Instant: 74.4 (#94), GPT-5 Mini: 76.4 (#43)
| Benchmark | GPT-5.5 Instant | GPT-5 Mini |
|---|---|---|
| LMArena Instruction Following | 1407 | 1357 |
| IFEval | — | 92.7% |
Long Context GPT-5.5 Instant leads
GPT-5.5 Instant: 43.4 (#92), GPT-5 Mini: 41.9 (#127)
| Benchmark | GPT-5.5 Instant | GPT-5 Mini |
|---|---|---|
| LMArena Longer Query | 1422 | 1355 |
| Fiction.LiveBench | — | 69.4% |
Writing & Preference GPT-5.5 Instant leads
GPT-5.5 Instant: 62.0 (#81), GPT-5 Mini: 55.4 (#143)
| Benchmark | GPT-5.5 Instant | GPT-5 Mini |
|---|---|---|
| LMArena Text | 1419 | 1373 |
| LMArena Creative Writing | 1420 | 1325 |
| LMArena Multi-Turn | 1434 | 1363 |
| Short-Story Creative Writing | — | 83.1% |
| EQ-Bench Creative Writing | — | 1313 |
| WildBench | — | 85.5% |
Frequently asked questions
Is GPT-5.5 Instant better than GPT-5 Mini?
GPT-5.5 Instant and GPT-5 Mini score almost the same on the Noometry Index (42.5 vs 41.7), so choose on price, context window or the category you care about most.
Is GPT-5.5 Instant or GPT-5 Mini better for coding?
GPT-5.5 Instant scores higher on coding benchmarks: 43.7 versus 40.0 in the Noometry coding category.
How many benchmarks do GPT-5.5 Instant and GPT-5 Mini share?
26 benchmarks have published results for both models. GPT-5.5 Instant has 27 scored results on Noometry and GPT-5 Mini has 60.