Model comparison
Inkling vs Step 2 16k Exp 202412
Inkling is the stronger model overall, scoring 44.1 to 39.2 on the Noometry Index.
Last verified . 12 shared benchmarks.
StepFunSummary
- They share 12 benchmarks with published results for both. Inkling scores higher in 6 categories and Step 2 16k Exp 202412 in 2 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Inkling leads 55.1 to 35.2.
- Inkling has downloadable open weights; the other is API-only.
Side by side
| Inkling | Step 2 16k Exp 202412 | |
|---|---|---|
| Provider | Thinking Machines Lab | StepFun |
| Noometry Index | 44.1 | 39.2 |
| Released | 2026-07-15 | — |
| Weights | Open | Proprietary |
| Context window | 66K | — |
| Max output | 66K | — |
| Input $ / M tokens | $1.87 | — |
| Output $ / M tokens | $4.68 | — |
| Results tracked | 41 | 12 |
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Category by category
Coding Step 2 16k Exp 202412 leads
Inkling: 34.5 (#234), Step 2 16k Exp 202412: 38.5 (#174)
| Benchmark | Inkling | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Coding | 1464 | 1316 |
| FrontierCode | 14% | — |
| LMArena WebDev | 1413 | — |
| FrontierSWE | 4.1% | — |
| SciCode | 47% | — |
| WeirdML | 32.3% | — |
| ALE-Bench | 946 | — |
Agentic & Tool Use Not comparable
Inkling: 29.6 (#85), Step 2 16k Exp 202412: —
| Benchmark | Inkling | Step 2 16k Exp 202412 |
|---|---|---|
| APEX-Agents | 33.8% | — |
| τ²-bench Banking | 25% | — |
Reasoning Inkling leads
Inkling: 40.4 (#56), Step 2 16k Exp 202412: 25.9 (#142)
| Benchmark | Inkling | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Hard Prompts | 1451 | 1299 |
| ARC-AGI-2 | 36.5% | — |
| SimpleBench | 50% | — |
| ARC-AGI-1 | 79.5% | — |
| CritPt | 5.4% | — |
| Chess Puzzles | 21% | — |
| DTBench | 87.5% | — |
| LMCA | 37.6% | — |
| Epoch Capabilities Index | 148.54 | — |
Math Step 2 16k Exp 202412 leads
Inkling: 31.3 (#225), Step 2 16k Exp 202412: 36.3 (#169)
| Benchmark | Inkling | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Math | 1479 | 1304 |
| FrontierMath (Tiers 1-3) | 33.3% | — |
| FrontierMath Tier 4 | 4.9% | — |
| OTIS Mock AIME 2024-2025 | 88.9% | — |
| ProofBench | 0% | — |
Knowledge Inkling leads
Inkling: 55.1 (#49), Step 2 16k Exp 202412: 35.2 (#187)
| Benchmark | Inkling | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Expert | 1465 | 1279 |
| GPQA Diamond | 88.3% | — |
| SimpleQA Verified | 40.3% | — |
Multilingual Inkling leads
Inkling: 54.0 (#52), Step 2 16k Exp 202412: 43.7 (#181)
| Benchmark | Inkling | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Non-English | 1434 | 1290 |
| LMArena Chinese | 1490 | 1331 |
| LMArena Russian | 1429 | 1324 |
| LMArena French | 1458 | — |
| LMArena German | 1446 | — |
| LMArena Japanese | 1429 | — |
| LMArena Korean | 1404 | — |
| LMArena Spanish | 1448 | — |
Instruction Following Inkling leads
Inkling: 75.1 (#71), Step 2 16k Exp 202412: 67.9 (#192)
| Benchmark | Inkling | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Instruction Following | 1426 | 1287 |
Long Context Inkling leads
Inkling: 43.8 (#86), Step 2 16k Exp 202412: 39.7 (#170)
| Benchmark | Inkling | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Longer Query | 1434 | 1307 |
Writing & Preference Inkling leads
Inkling: 65.2 (#51), Step 2 16k Exp 202412: 52.3 (#173)
| Benchmark | Inkling | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Text | 1441 | 1321 |
| LMArena Creative Writing | 1387 | 1328 |
| LMArena Multi-Turn | 1436 | 1292 |
| EQ-Bench Creative Writing | 1611 | — |
| EQ-Bench 4 | 1226 | — |
Frequently asked questions
Is Inkling better than Step 2 16k Exp 202412?
Inkling is the stronger model overall, scoring 44.1 to 39.2 on the Noometry Index.
Is Inkling or Step 2 16k Exp 202412 better for coding?
Step 2 16k Exp 202412 scores higher on coding benchmarks: 38.5 versus 34.5 in the Noometry coding category.
How many benchmarks do Inkling and Step 2 16k Exp 202412 share?
12 benchmarks have published results for both models. Inkling has 41 scored results on Noometry and Step 2 16k Exp 202412 has 12.