Model comparison
Chatgpt 4o Latest 20250326 vs Step 3.5 Flash
Chatgpt 4o Latest 20250326 is the stronger model overall, scoring 43.2 to 41.7 on the Noometry Index.
Last verified . 17 shared benchmarks.
StepFunSummary
- They share 17 benchmarks with published results for both. Chatgpt 4o Latest 20250326 scores higher in 5 categories and Step 3.5 Flash in 3 categories; 4 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Chatgpt 4o Latest 20250326 leads 32.8 to 21.2.
- Step 3.5 Flash has downloadable open weights; the other is API-only.
Side by side
| Chatgpt 4o Latest 20250326 | Step 3.5 Flash | |
|---|---|---|
| Provider | OpenAI | StepFun |
| Noometry Index | 43.2 | 41.7 |
| Released | — | 2026-01-29 |
| Weights | Proprietary | Open |
| Context window | — | 256K |
| Max output | — | 256K |
| Input $ / M tokens | — | $0.10 |
| Output $ / M tokens | — | $0.30 |
| Results tracked | 21 | 19 |
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Category by category
Coding Too close to call
Chatgpt 4o Latest 20250326: 41.0 (#122), Step 3.5 Flash: 41.7 (#106)
| Benchmark | Chatgpt 4o Latest 20250326 | Step 3.5 Flash |
|---|---|---|
| LMArena Coding | 1413 | 1436 |
Reasoning Chatgpt 4o Latest 20250326 leads
Chatgpt 4o Latest 20250326: 32.8 (#64), Step 3.5 Flash: 21.2 (#202)
| Benchmark | Chatgpt 4o Latest 20250326 | Step 3.5 Flash |
|---|---|---|
| LMArena Hard Prompts | 1424 | 1411 |
| Kagi LLM Benchmark | 75% | — |
| NYT Connections (extended) | — | 28.4% |
Math Step 3.5 Flash leads
Chatgpt 4o Latest 20250326: 35.8 (#134), Step 3.5 Flash: 40.6 (#77)
| Benchmark | Chatgpt 4o Latest 20250326 | Step 3.5 Flash |
|---|---|---|
| LMArena Math | 1407 | 1408 |
| MathArena Final-Answer Competitions | — | 66.8% |
Knowledge Too close to call
Chatgpt 4o Latest 20250326: 38.7 (#131), Step 3.5 Flash: 39.0 (#127)
| Benchmark | Chatgpt 4o Latest 20250326 | Step 3.5 Flash |
|---|---|---|
| LMArena Expert | 1400 | 1422 |
| Confabulations | 16.6% | — |
Multimodal Not comparable
Chatgpt 4o Latest 20250326: 38.9 (#54), Step 3.5 Flash: —
| Benchmark | Chatgpt 4o Latest 20250326 | Step 3.5 Flash |
|---|---|---|
| LMArena Vision | 1243 | — |
Multilingual Chatgpt 4o Latest 20250326 leads
Chatgpt 4o Latest 20250326: 53.1 (#72), Step 3.5 Flash: 50.7 (#115)
| Benchmark | Chatgpt 4o Latest 20250326 | Step 3.5 Flash |
|---|---|---|
| LMArena Non-English | 1419 | 1386 |
| LMArena Chinese | 1456 | 1448 |
| LMArena French | 1447 | 1421 |
| LMArena German | 1424 | 1404 |
| LMArena Japanese | 1406 | 1353 |
| LMArena Korean | 1397 | 1350 |
| LMArena Russian | 1429 | 1385 |
| LMArena Spanish | 1435 | 1419 |
Instruction Following Too close to call
Chatgpt 4o Latest 20250326: 74.2 (#102), Step 3.5 Flash: 73.3 (#119)
| Benchmark | Chatgpt 4o Latest 20250326 | Step 3.5 Flash |
|---|---|---|
| LMArena Instruction Following | 1403 | 1385 |
Long Context Too close to call
Chatgpt 4o Latest 20250326: 43.1 (#104), Step 3.5 Flash: 42.8 (#112)
| Benchmark | Chatgpt 4o Latest 20250326 | Step 3.5 Flash |
|---|---|---|
| LMArena Longer Query | 1413 | 1402 |
Writing & Preference Chatgpt 4o Latest 20250326 leads
Chatgpt 4o Latest 20250326: 62.8 (#68), Step 3.5 Flash: 59.0 (#108)
| Benchmark | Chatgpt 4o Latest 20250326 | Step 3.5 Flash |
|---|---|---|
| LMArena Text | 1429 | 1403 |
| LMArena Creative Writing | 1406 | 1357 |
| LMArena Multi-Turn | 1454 | 1405 |
| EQ-Bench Creative Writing | 1501 | — |
Frequently asked questions
Is Chatgpt 4o Latest 20250326 better than Step 3.5 Flash?
Chatgpt 4o Latest 20250326 is the stronger model overall, scoring 43.2 to 41.7 on the Noometry Index.
Is Chatgpt 4o Latest 20250326 or Step 3.5 Flash better for coding?
They score almost the same on coding (41.0 vs 41.7); test both on your own repository before choosing.
How many benchmarks do Chatgpt 4o Latest 20250326 and Step 3.5 Flash share?
17 benchmarks have published results for both models. Chatgpt 4o Latest 20250326 has 21 scored results on Noometry and Step 3.5 Flash has 19.