Model comparison
Grok 4.5 vs Step 2 16k Exp 202412
Grok 4.5 is the stronger model overall, scoring 55.0 to 38.6 on the Noometry Index.
Last verified . 12 shared benchmarks.
StepFunSummary
- They share 12 benchmarks with published results for both. Grok 4.5 scores higher in 8 categories and Step 2 16k Exp 202412 in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.5 leads 56.0 to 24.8.
Side by side
| Grok 4.5 | Step 2 16k Exp 202412 | |
|---|---|---|
| Provider | xAI | StepFun |
| Noometry Index | 55.0 | 38.6 |
| Released | 2026-07-08 | — |
| Weights | Proprietary | Proprietary |
| Context window | 500K | — |
| Max output | 500K | — |
| Input $ / M tokens | $2 | — |
| Output $ / M tokens | $6 | — |
| Results tracked | 52 | 12 |
Sponsored placements are available on pages like this one. Advertise on Noometry
Category by category
Coding Grok 4.5 leads
Grok 4.5: 51.7 (#34), Step 2 16k Exp 202412: 37.9 (#170)
| Benchmark | Grok 4.5 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Coding | 1473 | 1316 |
| DeepSWE | 53.8% | — |
| FrontierCode | 42.4% | — |
| LMArena WebDev | 1552 | — |
| SciCode | 54.1% | — |
| WeirdML | 46.4% | — |
| ALE-Bench | 1,309 | — |
Agentic & Tool Use Not comparable
Grok 4.5: 44.4 (#15), Step 2 16k Exp 202412: —
| Benchmark | Grok 4.5 | Step 2 16k Exp 202412 |
|---|---|---|
| APEX-Agents | 56.2% | — |
| τ²-bench Banking | 47.9% | — |
| PostTrainBench | 23.4% | — |
| GBAEval | 65.4% | — |
| GDP.pdf | 14% | — |
| LMArena Search | 1213 | — |
| Vending-Bench 2 | 3,887 | — |
Reasoning Grok 4.5 leads
Grok 4.5: 56.0 (#23), Step 2 16k Exp 202412: 24.8 (#140)
| Benchmark | Grok 4.5 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Hard Prompts | 1462 | 1299 |
| ARC-AGI-2 | 52.6% | — |
| SimpleBench | 70% | — |
| Kagi LLM Benchmark | 83.5% | — |
| NYT Connections (extended) | 79.9% | — |
| ARC-AGI-1 | 87.2% | — |
| CritPt | 15.4% | — |
| Chess Puzzles | 36% | — |
| DTBench | 96.5% | — |
| LMCA | 45.2% | — |
| Surface Evolver Bench | 74.4% | — |
| Epoch Capabilities Index | 154.02 | — |
Math Grok 4.5 leads
Grok 4.5: 60.7 (#29), Step 2 16k Exp 202412: 33.6 (#171)
| Benchmark | Grok 4.5 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Math | 1457 | 1305 |
| FrontierMath (Tiers 1-3) | 57.2% | — |
| FrontierMath Tier 4 | 24.4% | — |
| OTIS Mock AIME 2024-2025 | 97.8% | — |
| ProofBench | 31% | — |
Knowledge Grok 4.5 leads
Grok 4.5: 62.3 (#21), Step 2 16k Exp 202412: 34.6 (#187)
| Benchmark | Grok 4.5 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Expert | 1466 | 1279 |
| GPQA Diamond | 93.4% | — |
| SimpleQA Verified | 48.3% | — |
Multimodal Not comparable
Grok 4.5: 37.8 (#63), Step 2 16k Exp 202412: —
| Benchmark | Grok 4.5 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Vision | 1287 | — |
| Blueprint-Bench 2 | 27.3% | — |
| Furniture Assembly | 22.5% | — |
| LMArena Document | 1452 | — |
Multilingual Grok 4.5 leads
Grok 4.5: 54.5 (#43), Step 2 16k Exp 202412: 43.9 (#176)
| Benchmark | Grok 4.5 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Non-English | 1439 | 1290 |
| LMArena Chinese | 1497 | 1331 |
| LMArena Russian | 1447 | 1324 |
| LMArena French | 1458 | — |
| LMArena German | 1448 | — |
| LMArena Japanese | 1425 | — |
| LMArena Korean | 1402 | — |
| LMArena Spanish | 1452 | — |
Instruction Following Grok 4.5 leads
Grok 4.5: 76.3 (#45), Step 2 16k Exp 202412: 68.1 (#187)
| Benchmark | Grok 4.5 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Instruction Following | 1446 | 1287 |
Long Context Grok 4.5 leads
Grok 4.5: 44.8 (#54), Step 2 16k Exp 202412: 39.7 (#165)
| Benchmark | Grok 4.5 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Longer Query | 1463 | 1307 |
Writing & Preference Grok 4.5 leads
Grok 4.5: 65.9 (#40), Step 2 16k Exp 202412: 52.5 (#168)
| Benchmark | Grok 4.5 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Text | 1448 | 1321 |
| LMArena Creative Writing | 1442 | 1328 |
| LMArena Multi-Turn | 1457 | 1292 |
| EQ-Bench Creative Writing | 1579 | — |
Frequently asked questions
Is Grok 4.5 better than Step 2 16k Exp 202412?
Grok 4.5 is the stronger model overall, scoring 55.0 to 38.6 on the Noometry Index.
Is Grok 4.5 or Step 2 16k Exp 202412 better for coding?
Grok 4.5 scores higher on coding benchmarks: 51.7 versus 37.9 in the Noometry coding category.
How many benchmarks do Grok 4.5 and Step 2 16k Exp 202412 share?
12 benchmarks have published results for both models. Grok 4.5 has 52 scored results on Noometry and Step 2 16k Exp 202412 has 12.