Model comparison
Chatgpt 4o Latest 20250326 vs GPT-5.5 Instant
Chatgpt 4o Latest 20250326 and GPT-5.5 Instant score almost the same on the Noometry Index (43.2 vs 42.5), so choose on price, context window or the category you care about most.
Last verified . 18 shared benchmarks.
Summary
- They share 18 benchmarks with published results for both. Chatgpt 4o Latest 20250326 scores higher in 4 categories and GPT-5.5 Instant in 5 categories; 4 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where GPT-5.5 Instant leads 48.9 to 38.7.
Side by side
| Chatgpt 4o Latest 20250326 | GPT-5.5 Instant | |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Noometry Index | 43.2 | 42.5 |
| Released | — | 2026-05-05 |
| Weights | Proprietary | Proprietary |
| Context window | — | — |
| Max output | — | — |
| Input $ / M tokens | — | — |
| Output $ / M tokens | — | — |
| Results tracked | 21 | 27 |
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Category by category
Coding GPT-5.5 Instant leads
Chatgpt 4o Latest 20250326: 41.0 (#122), GPT-5.5 Instant: 43.7 (#73)
| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5.5 Instant |
|---|---|---|
| LMArena Coding | 1413 | 1433 |
| SciCode | — | 48.6% |
Reasoning Chatgpt 4o Latest 20250326 leads
Chatgpt 4o Latest 20250326: 32.8 (#64), GPT-5.5 Instant: 24.2 (#149)
| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5.5 Instant |
|---|---|---|
| LMArena Hard Prompts | 1424 | 1426 |
| Kagi LLM Benchmark | 75% | — |
| CritPt | — | 0% |
| Chess Puzzles | — | 12% |
| Epoch Capabilities Index | — | 142.48 |
Math Chatgpt 4o Latest 20250326 leads
Chatgpt 4o Latest 20250326: 35.8 (#134), GPT-5.5 Instant: 26.1 (#241)
| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5.5 Instant |
|---|---|---|
| LMArena Math | 1407 | 1420 |
| FrontierMath (Tiers 1-3) | — | 26.3% |
| FrontierMath Tier 4 | — | 2.4% |
| OTIS Mock AIME 2024-2025 | — | 68.1% |
Knowledge GPT-5.5 Instant leads
Chatgpt 4o Latest 20250326: 38.7 (#131), GPT-5.5 Instant: 48.9 (#68)
| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5.5 Instant |
|---|---|---|
| LMArena Expert | 1400 | 1409 |
| GPQA Diamond | — | 82.5% |
| Confabulations | 16.6% | — |
Multimodal Too close to call
Chatgpt 4o Latest 20250326: 38.9 (#54), GPT-5.5 Instant: 39.3 (#48)
| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5.5 Instant |
|---|---|---|
| LMArena Vision | 1243 | 1250 |
| LMArena Document | — | 1403 |
Multilingual Too close to call
Chatgpt 4o Latest 20250326: 53.1 (#72), GPT-5.5 Instant: 53.0 (#76)
| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5.5 Instant |
|---|---|---|
| LMArena Non-English | 1419 | 1417 |
| LMArena Chinese | 1456 | 1457 |
| LMArena French | 1447 | 1428 |
| LMArena German | 1424 | 1410 |
| LMArena Japanese | 1406 | 1408 |
| LMArena Korean | 1397 | 1393 |
| LMArena Russian | 1429 | 1430 |
| LMArena Spanish | 1435 | 1430 |
Instruction Following Too close to call
Chatgpt 4o Latest 20250326: 74.2 (#102), GPT-5.5 Instant: 74.4 (#94)
| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5.5 Instant |
|---|---|---|
| LMArena Instruction Following | 1403 | 1407 |
Long Context Too close to call
Chatgpt 4o Latest 20250326: 43.1 (#104), GPT-5.5 Instant: 43.4 (#92)
| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5.5 Instant |
|---|---|---|
| LMArena Longer Query | 1413 | 1422 |
Writing & Preference Too close to call
Chatgpt 4o Latest 20250326: 62.8 (#68), GPT-5.5 Instant: 62.0 (#81)
| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5.5 Instant |
|---|---|---|
| LMArena Text | 1429 | 1419 |
| LMArena Creative Writing | 1406 | 1420 |
| LMArena Multi-Turn | 1454 | 1434 |
| EQ-Bench Creative Writing | 1501 | — |
Frequently asked questions
Is Chatgpt 4o Latest 20250326 better than GPT-5.5 Instant?
Chatgpt 4o Latest 20250326 and GPT-5.5 Instant score almost the same on the Noometry Index (43.2 vs 42.5), so choose on price, context window or the category you care about most.
Is Chatgpt 4o Latest 20250326 or GPT-5.5 Instant better for coding?
GPT-5.5 Instant scores higher on coding benchmarks: 43.7 versus 41.0 in the Noometry coding category.
How many benchmarks do Chatgpt 4o Latest 20250326 and GPT-5.5 Instant share?
18 benchmarks have published results for both models. Chatgpt 4o Latest 20250326 has 21 scored results on Noometry and GPT-5.5 Instant has 27.