Model comparison
Grok 4.3 vs Step 2 16k Exp 202412
Grok 4.3 is the stronger model overall, scoring 43.8 to 39.2 on the Noometry Index.
Last verified . 12 shared benchmarks.
StepFunSummary
- They share 12 benchmarks with published results for both. Grok 4.3 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 knowledge, where Grok 4.3 leads 52.5 to 35.2.
Side by side
| Grok 4.3 | Step 2 16k Exp 202412 | |
|---|---|---|
| Provider | xAI | StepFun |
| Noometry Index | 43.8 | 39.2 |
| Released | 2026-04-17 | — |
| Weights | Proprietary | Proprietary |
| Context window | 1M | — |
| Max output | 30K | — |
| Input $ / M tokens | $1.25 | — |
| Output $ / M tokens | $2.50 | — |
| Results tracked | 40 | 12 |
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Category by category
Coding Grok 4.3 leads
Grok 4.3: 41.6 (#121), Step 2 16k Exp 202412: 38.5 (#174)
| Benchmark | Grok 4.3 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Coding | 1415 | 1316 |
| LMArena WebDev | 1357 | — |
| SciCode | 47.3% | — |
| WeirdML | 49.9% | — |
| ALE-Bench | 944.17 | — |
Agentic & Tool Use Not comparable
Grok 4.3: 27.7 (#99), Step 2 16k Exp 202412: —
| Benchmark | Grok 4.3 | Step 2 16k Exp 202412 |
|---|---|---|
| GDP.pdf | 8% | — |
| LMArena Search | 1165 | — |
| Vending-Bench 2 | 35.26 | — |
Reasoning Grok 4.3 leads
Grok 4.3: 35.9 (#68), Step 2 16k Exp 202412: 25.9 (#142)
| Benchmark | Grok 4.3 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Hard Prompts | 1396 | 1299 |
| NYT Connections (extended) | 55.2% | — |
| CritPt | 8% | — |
| Chess Puzzles | 25% | — |
| DTBench | 90.7% | — |
| LMCA | 38.3% | — |
| Epoch Capabilities Index | 149.16 | — |
| ForecastBench | 60.3 | — |
Math Grok 4.3 leads
Grok 4.3: 46.0 (#74), Step 2 16k Exp 202412: 36.3 (#169)
| Benchmark | Grok 4.3 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Math | 1388 | 1304 |
| FrontierMath (Tiers 1-3) | 42.8% | — |
| FrontierMath Tier 4 | 14.6% | — |
| OTIS Mock AIME 2024-2025 | 93.3% | — |
| ProofBench | 11% | — |
Knowledge Grok 4.3 leads
Grok 4.3: 52.5 (#62), Step 2 16k Exp 202412: 35.2 (#187)
| Benchmark | Grok 4.3 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Expert | 1385 | 1279 |
| GPQA Diamond | 88.8% | — |
| SimpleQA Verified | 33.2% | — |
Multimodal Not comparable
Grok 4.3: 31.6 (#104), Step 2 16k Exp 202412: —
| Benchmark | Grok 4.3 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Vision | 1229 | — |
| Blueprint-Bench 2 | 0% | — |
Multilingual Grok 4.3 leads
Grok 4.3: 50.5 (#120), Step 2 16k Exp 202412: 43.7 (#181)
| Benchmark | Grok 4.3 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Non-English | 1385 | 1290 |
| LMArena Chinese | 1422 | 1331 |
| LMArena Russian | 1399 | 1324 |
| LMArena French | 1412 | — |
| LMArena German | 1395 | — |
| LMArena Japanese | 1379 | — |
| LMArena Korean | 1356 | — |
| LMArena Spanish | 1398 | — |
Instruction Following Grok 4.3 leads
Grok 4.3: 72.1 (#140), Step 2 16k Exp 202412: 67.9 (#192)
| Benchmark | Grok 4.3 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Instruction Following | 1366 | 1287 |
Long Context Grok 4.3 leads
Grok 4.3: 42.5 (#123), Step 2 16k Exp 202412: 39.7 (#170)
| Benchmark | Grok 4.3 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Longer Query | 1393 | 1307 |
Writing & Preference Grok 4.3 leads
Grok 4.3: 58.5 (#118), Step 2 16k Exp 202412: 52.3 (#173)
| Benchmark | Grok 4.3 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Text | 1397 | 1321 |
| LMArena Creative Writing | 1380 | 1328 |
| LMArena Multi-Turn | 1406 | 1292 |
| EQ-Bench 4 | 1075 | — |
Frequently asked questions
Is Grok 4.3 better than Step 2 16k Exp 202412?
Grok 4.3 is the stronger model overall, scoring 43.8 to 39.2 on the Noometry Index.
Is Grok 4.3 or Step 2 16k Exp 202412 better for coding?
Grok 4.3 scores higher on coding benchmarks: 41.6 versus 38.5 in the Noometry coding category.
How many benchmarks do Grok 4.3 and Step 2 16k Exp 202412 share?
12 benchmarks have published results for both models. Grok 4.3 has 40 scored results on Noometry and Step 2 16k Exp 202412 has 12.