Model comparison
GPT-5.5 Pro vs Step 1o Turbo 202506
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 39.7 on the Noometry Index.
Last verified . 0 shared benchmarks.
StepFunSummary
- The widest gap is in math, where GPT-5.5 Pro leads 84.0 to 36.6.
Side by side
| GPT-5.5 Pro | Step 1o Turbo 202506 | |
|---|---|---|
| Provider | OpenAI | StepFun |
| Noometry Index | 64.3 | 39.7 |
| Released | 2026-04-23 | — |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | — |
| Max output | 128K | — |
| Input $ / M tokens | $30 | — |
| Output $ / M tokens | $180 | — |
| Results tracked | 14 | 14 |
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Category by category
Coding Not comparable
GPT-5.5 Pro: —, Step 1o Turbo 202506: 39.2 (#160)
| Benchmark | GPT-5.5 Pro | Step 1o Turbo 202506 |
|---|---|---|
| LMArena Coding | — | 1339 |
Reasoning GPT-5.5 Pro leads
GPT-5.5 Pro: 73.3 (#10), Step 1o Turbo 202506: 26.8 (#129)
| Benchmark | GPT-5.5 Pro | Step 1o Turbo 202506 |
|---|---|---|
| ARC-AGI-2 | 84.6% | — |
| SimpleBench | 76.9% | — |
| ARC-AGI-1 | 96.5% | — |
| CritPt | 30.6% | — |
| Chess Puzzles | 64% | — |
| LMArena Hard Prompts | — | 1335 |
| DTBench | 96% | — |
| LMCA | 53.9% | — |
| Epoch Capabilities Index | 162.07 | — |
Math GPT-5.5 Pro leads
GPT-5.5 Pro: 84.0 (#10), Step 1o Turbo 202506: 36.6 (#164)
| Benchmark | GPT-5.5 Pro | Step 1o Turbo 202506 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 87.7% | — |
| FrontierMath Tier 4 | 78% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| LMArena Math | — | 1318 |
| FrontierMath (Feb 2025 set) | 52.4% | — |
| FrontierMath Tier 4 (v1) | 39.6% | — |
Knowledge GPT-5.5 Pro leads
GPT-5.5 Pro: 64.1 (#19), Step 1o Turbo 202506: 36.1 (#176)
| Benchmark | GPT-5.5 Pro | Step 1o Turbo 202506 |
|---|---|---|
| GPQA Diamond | 93.9% | — |
| LMArena Expert | — | 1308 |
Multimodal Not comparable
GPT-5.5 Pro: —, Step 1o Turbo 202506: 36.1 (#80)
| Benchmark | GPT-5.5 Pro | Step 1o Turbo 202506 |
|---|---|---|
| LMArena Vision | — | 1186 |
Multilingual Not comparable
GPT-5.5 Pro: —, Step 1o Turbo 202506: 45.3 (#173)
| Benchmark | GPT-5.5 Pro | Step 1o Turbo 202506 |
|---|---|---|
| LMArena Non-English | — | 1313 |
| LMArena Chinese | — | 1380 |
| LMArena German | — | 1314 |
| LMArena Russian | — | 1327 |
Instruction Following Not comparable
GPT-5.5 Pro: —, Step 1o Turbo 202506: 69.2 (#176)
| Benchmark | GPT-5.5 Pro | Step 1o Turbo 202506 |
|---|---|---|
| LMArena Instruction Following | — | 1310 |
Long Context Not comparable
GPT-5.5 Pro: —, Step 1o Turbo 202506: 41.0 (#146)
| Benchmark | GPT-5.5 Pro | Step 1o Turbo 202506 |
|---|---|---|
| LMArena Longer Query | — | 1348 |
Writing & Preference Not comparable
GPT-5.5 Pro: —, Step 1o Turbo 202506: 53.1 (#160)
| Benchmark | GPT-5.5 Pro | Step 1o Turbo 202506 |
|---|---|---|
| LMArena Text | — | 1336 |
| LMArena Creative Writing | — | 1307 |
| LMArena Multi-Turn | — | 1340 |
Frequently asked questions
Is GPT-5.5 Pro better than Step 1o Turbo 202506?
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 39.7 on the Noometry Index.
How many benchmarks do GPT-5.5 Pro and Step 1o Turbo 202506 share?
0 benchmarks have published results for both models. GPT-5.5 Pro has 14 scored results on Noometry and Step 1o Turbo 202506 has 14.