Model comparison
Chatgpt 4o Latest 20250326 vs GPT-5 Nano
Chatgpt 4o Latest 20250326 is the stronger model overall, scoring 43.2 to 33.4 on the Noometry Index.
Last verified . 18 shared benchmarks.
Summary
- They share 18 benchmarks with published results for both. Chatgpt 4o Latest 20250326 scores higher in 8 categories and GPT-5 Nano in 1 category; 8 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Chatgpt 4o Latest 20250326 leads 62.8 to 39.4.
- The biggest single-benchmark swing is Kagi LLM Benchmark: 75% for Chatgpt 4o Latest 20250326 and 62.2% for GPT-5 Nano.
Side by side
| Chatgpt 4o Latest 20250326 | GPT-5 Nano | |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Noometry Index | 43.2 | 33.4 |
| Released | — | 2025-08-07 |
| Weights | Proprietary | Proprietary |
| Context window | — | 400K |
| Max output | — | 128K |
| Input $ / M tokens | — | $0.05 |
| Output $ / M tokens | — | $0.40 |
| Results tracked | 21 | 48 |
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Category by category
Coding Chatgpt 4o Latest 20250326 leads
Chatgpt 4o Latest 20250326: 41.0 (#122), GPT-5 Nano: 33.3 (#248)
| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5 Nano |
|---|---|---|
| LMArena Coding | 1413 | 1351 |
| SWE-bench Verified (bash only) | — | 34.8% |
| WeirdML | — | 38.1% |
| ALE-Bench | — | 718.67 |
Agentic & Tool Use Not comparable
Chatgpt 4o Latest 20250326: —, GPT-5 Nano: 25.6 (#99)
| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5 Nano |
|---|---|---|
| Terminal-Bench | — | 21.8% |
| Berkeley Function Calling Leaderboard | — | 51.5% |
Reasoning Chatgpt 4o Latest 20250326 leads
Chatgpt 4o Latest 20250326: 32.8 (#64), GPT-5 Nano: 16.4 (#291)
| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5 Nano |
|---|---|---|
| Kagi LLM Benchmark | 75% | 62.2% |
| LMArena Hard Prompts | 1424 | 1329 |
| ARC-AGI-2 | — | 2.6% |
| ARC-AGI-1 | — | 20.7% |
| Chess Puzzles | — | 27% |
| Mystery Game Puzzles | — | 9% |
| DTBench | — | 62.7% |
| LMCA | — | 7.9% |
| Epoch Capabilities Index | — | 139.39 |
| ForecastBench | — | 59.1 |
Math Chatgpt 4o Latest 20250326 leads
Chatgpt 4o Latest 20250326: 35.8 (#134), GPT-5 Nano: 29.1 (#221)
| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5 Nano |
|---|---|---|
| LMArena Math | 1407 | 1318 |
| FrontierMath (Tiers 1-3) | — | 20% |
| FrontierMath Tier 4 | — | 2.4% |
| OTIS Mock AIME 2024-2025 | — | 81.1% |
| ProofBench | — | 12% |
| Omni-MATH | — | 54.6% |
| MATH Level 5 | — | 95.2% |
| FrontierMath (Feb 2025 set) | — | 8.3% |
| FrontierMath Tier 4 (v1) | — | 2.1% |
Knowledge Chatgpt 4o Latest 20250326 leads
Chatgpt 4o Latest 20250326: 38.7 (#131), GPT-5 Nano: 35.8 (#166)
| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5 Nano |
|---|---|---|
| LMArena Expert | 1400 | 1321 |
| GPQA Diamond | — | 69.4% |
| SimpleQA Verified | — | 11.7% |
| MMLU-Pro | — | 77.8% |
| Confabulations | 16.6% | — |
| Vectara Hallucination Rate | — | 10.5% |
| GPQA (HELM) | — | 67.9% |
Multimodal Chatgpt 4o Latest 20250326 leads
Chatgpt 4o Latest 20250326: 38.9 (#54), GPT-5 Nano: 30.7 (#102)
| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5 Nano |
|---|---|---|
| LMArena Vision | 1243 | 1159 |
| VPCT | — | 37.2% |
Multilingual Chatgpt 4o Latest 20250326 leads
Chatgpt 4o Latest 20250326: 53.1 (#72), GPT-5 Nano: 45.5 (#167)
| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5 Nano |
|---|---|---|
| LMArena Non-English | 1419 | 1313 |
| LMArena Chinese | 1456 | 1355 |
| LMArena German | 1424 | 1329 |
| LMArena Korean | 1397 | 1269 |
| LMArena Russian | 1429 | 1296 |
| LMArena Spanish | 1435 | 1360 |
| LMArena French | 1447 | — |
| LMArena Japanese | 1406 | — |
Instruction Following Too close to call
Chatgpt 4o Latest 20250326: 74.2 (#102), GPT-5 Nano: 75.2 (#72)
| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5 Nano |
|---|---|---|
| LMArena Instruction Following | 1403 | 1306 |
| IFEval | — | 93.2% |
Long Context Chatgpt 4o Latest 20250326 leads
Chatgpt 4o Latest 20250326: 43.1 (#104), GPT-5 Nano: 31.3 (#275)
| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5 Nano |
|---|---|---|
| LMArena Longer Query | 1413 | 1313 |
| Fiction.LiveBench | — | 44.4% |
Writing & Preference Chatgpt 4o Latest 20250326 leads
Chatgpt 4o Latest 20250326: 62.8 (#68), GPT-5 Nano: 39.4 (#244)
| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5 Nano |
|---|---|---|
| LMArena Text | 1429 | 1320 |
| LMArena Creative Writing | 1406 | 1250 |
| EQ-Bench Creative Writing | 1501 | 705 |
| LMArena Multi-Turn | 1454 | 1311 |
| WildBench | — | 80.6% |
Frequently asked questions
Is Chatgpt 4o Latest 20250326 better than GPT-5 Nano?
Chatgpt 4o Latest 20250326 is the stronger model overall, scoring 43.2 to 33.4 on the Noometry Index.
Is Chatgpt 4o Latest 20250326 or GPT-5 Nano better for coding?
Chatgpt 4o Latest 20250326 scores higher on coding benchmarks: 41.0 versus 33.3 in the Noometry coding category.
How many benchmarks do Chatgpt 4o Latest 20250326 and GPT-5 Nano share?
18 benchmarks have published results for both models. Chatgpt 4o Latest 20250326 has 21 scored results on Noometry and GPT-5 Nano has 48.