Model comparison
Chatgpt 4o Latest 20250326 vs gpt-oss-120b
Chatgpt 4o Latest 20250326 is the stronger model overall, scoring 43.8 to 36.3 on the Noometry Index.
Last verified . 20 shared benchmarks.
Summary
- They share 20 benchmarks with published results for both. Chatgpt 4o Latest 20250326 scores higher in 6 categories and gpt-oss-120b in 2 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Chatgpt 4o Latest 20250326 leads 62.6 to 46.5.
- The biggest single-benchmark swing is Kagi LLM Benchmark: 75% for Chatgpt 4o Latest 20250326 and 58.6% for gpt-oss-120b.
- gpt-oss-120b has downloadable open weights; the other is API-only.
Side by side
| Chatgpt 4o Latest 20250326 | gpt-oss-120b | |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Noometry Index | 43.8 | 36.3 |
| Released | — | 2025-08-05 |
| Weights | Proprietary | Open |
| Context window | — | 131K |
| Max output | — | 41K |
| Input $ / M tokens | — | $0.037 |
| Output $ / M tokens | — | $0.17 |
| Results tracked | 21 | 48 |
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Category by category
Coding Chatgpt 4o Latest 20250326 leads
Chatgpt 4o Latest 20250326: 41.6 (#122), gpt-oss-120b: 33.5 (#256)
| Benchmark | Chatgpt 4o Latest 20250326 | gpt-oss-120b |
|---|---|---|
| LMArena Coding | 1413 | 1380 |
| SWE-bench Verified (bash only) | — | 26% |
| Aider Polyglot | — | 41.8% |
| SciCode | — | 36% |
| WeirdML | — | 48.2% |
| ALE-Bench | — | 575.62 |
| AlgoTune | — | 1.41 |
Agentic & Tool Use Not comparable
Chatgpt 4o Latest 20250326: —, gpt-oss-120b: 12.2 (#153)
| Benchmark | Chatgpt 4o Latest 20250326 | gpt-oss-120b |
|---|---|---|
| Terminal-Bench | — | 18.7% |
| APEX-Agents | — | 4.4% |
| METR Time Horizons | — | 56.6% |
| Vending-Bench 2 | — | -21.53 |
Reasoning Chatgpt 4o Latest 20250326 leads
Chatgpt 4o Latest 20250326: 33.8 (#71), gpt-oss-120b: 20.0 (#245)
| Benchmark | Chatgpt 4o Latest 20250326 | gpt-oss-120b |
|---|---|---|
| Kagi LLM Benchmark | 75% | 58.6% |
| LMArena Hard Prompts | 1424 | 1364 |
| SimpleBench | — | 22.1% |
| CritPt | — | 1.1% |
| Chess Puzzles | — | 20% |
| Mystery Game Puzzles | — | 2% |
| DTBench | — | 76.3% |
| LMCA | — | 22.1% |
| Surface Evolver Bench | — | 25% |
| Epoch Capabilities Index | — | 139.93 |
Math gpt-oss-120b leads
Chatgpt 4o Latest 20250326: 38.6 (#134), gpt-oss-120b: 52.5 (#50)
| Benchmark | Chatgpt 4o Latest 20250326 | gpt-oss-120b |
|---|---|---|
| LMArena Math | 1407 | 1389 |
| OTIS Mock AIME 2024-2025 | — | 88.9% |
| Omni-MATH | — | 68.8% |
Knowledge gpt-oss-120b leads
Chatgpt 4o Latest 20250326: 39.2 (#137), gpt-oss-120b: 42.4 (#96)
| Benchmark | Chatgpt 4o Latest 20250326 | gpt-oss-120b |
|---|---|---|
| Confabulations | 16.6% | 15.7% |
| LMArena Expert | 1401 | 1356 |
| GPQA Diamond | — | 75.8% |
| MMLU-Pro | — | 79.5% |
| Vectara Hallucination Rate | — | 14.2% |
| GPQA (HELM) | — | 68.4% |
Multimodal Not comparable
Chatgpt 4o Latest 20250326: 39.6 (#58), gpt-oss-120b: —
| Benchmark | Chatgpt 4o Latest 20250326 | gpt-oss-120b |
|---|---|---|
| LMArena Vision | 1243 | — |
Multilingual Chatgpt 4o Latest 20250326 leads
Chatgpt 4o Latest 20250326: 52.9 (#76), gpt-oss-120b: 48.0 (#147)
| Benchmark | Chatgpt 4o Latest 20250326 | gpt-oss-120b |
|---|---|---|
| LMArena Non-English | 1419 | 1351 |
| LMArena Chinese | 1457 | 1385 |
| LMArena French | 1446 | 1369 |
| LMArena German | 1423 | 1353 |
| LMArena Japanese | 1405 | 1331 |
| LMArena Korean | 1396 | 1282 |
| LMArena Russian | 1429 | 1343 |
| LMArena Spanish | 1434 | 1389 |
Instruction Following Chatgpt 4o Latest 20250326 leads
Chatgpt 4o Latest 20250326: 74.0 (#107), gpt-oss-120b: 69.3 (#173)
| Benchmark | Chatgpt 4o Latest 20250326 | gpt-oss-120b |
|---|---|---|
| LMArena Instruction Following | 1403 | 1318 |
| IFEval | — | 83.6% |
Long Context Chatgpt 4o Latest 20250326 leads
Chatgpt 4o Latest 20250326: 43.1 (#107), gpt-oss-120b: 31.4 (#278)
| Benchmark | Chatgpt 4o Latest 20250326 | gpt-oss-120b |
|---|---|---|
| LMArena Longer Query | 1413 | 1319 |
| Fiction.LiveBench | — | 44.4% |
Writing & Preference Chatgpt 4o Latest 20250326 leads
Chatgpt 4o Latest 20250326: 62.6 (#72), gpt-oss-120b: 46.5 (#217)
| Benchmark | Chatgpt 4o Latest 20250326 | gpt-oss-120b |
|---|---|---|
| LMArena Text | 1429 | 1365 |
| LMArena Creative Writing | 1405 | 1275 |
| EQ-Bench Creative Writing | 1501 | 961 |
| LMArena Multi-Turn | 1454 | 1340 |
| Short-Story Creative Writing | — | 77.1% |
| WildBench | — | 84.5% |
Frequently asked questions
Is Chatgpt 4o Latest 20250326 better than gpt-oss-120b?
Chatgpt 4o Latest 20250326 is the stronger model overall, scoring 43.8 to 36.3 on the Noometry Index.
Is Chatgpt 4o Latest 20250326 or gpt-oss-120b better for coding?
Chatgpt 4o Latest 20250326 scores higher on coding benchmarks: 41.6 versus 33.5 in the Noometry coding category.
How many benchmarks do Chatgpt 4o Latest 20250326 and gpt-oss-120b share?
20 benchmarks have published results for both models. Chatgpt 4o Latest 20250326 has 21 scored results on Noometry and gpt-oss-120b has 48.