Model comparison
Inkling-Small vs Solar Pro4
Inkling-Small is the stronger model overall, scoring 46.5 to 42.1 on the Noometry Index.
Last verified . 18 shared benchmarks.
UpstageSummary
- They share 18 benchmarks with published results for both. Inkling-Small scores higher in 8 categories and Solar Pro4 in 0 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Inkling-Small leads 38.6 to 28.5.
- Solar Pro4 is cheaper at $0.30 / $1.20 per million input/output tokens, against $0.45 / $1.20 for Inkling-Small.
- Inkling-Small has downloadable open weights; the other is API-only.
Side by side
| Inkling-Small | Solar Pro4 | |
|---|---|---|
| Provider | Thinking Machines Lab | Upstage |
| Noometry Index | 46.5 | 42.1 |
| Released | 2026-07-15 | 2026-08-06 |
| Weights | Open | Proprietary |
| Context window | 524K | 524K |
| Max output | 1.05M | 131K |
| Input $ / M tokens | $0.45 | $0.30 |
| Output $ / M tokens | $1.20 | $1.20 |
| Results tracked | 33 | 18 |
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Category by category
Coding Inkling-Small leads
Inkling-Small: 43.6 (#85), Solar Pro4: 40.1 (#149)
| Benchmark | Inkling-Small | Solar Pro4 |
|---|---|---|
| LMArena WebDev | 1409 | 1371 |
| LMArena Coding | 1451 | 1437 |
| SciCode | 48.7% | — |
Reasoning Inkling-Small leads
Inkling-Small: 38.6 (#63), Solar Pro4: 28.5 (#104)
| Benchmark | Inkling-Small | Solar Pro4 |
|---|---|---|
| LMArena Hard Prompts | 1423 | 1399 |
| ARC-AGI-2 | 40.1% | — |
| ARC-AGI-1 | 84% | — |
| CritPt | 8.3% | — |
| Chess Puzzles | 18% | — |
| Mystery Game Puzzles | 6% | — |
| Epoch Capabilities Index | 150.15 | — |
Math Inkling-Small leads
Inkling-Small: 45.1 (#77), Solar Pro4: 38.8 (#128)
| Benchmark | Inkling-Small | Solar Pro4 |
|---|---|---|
| LMArena Math | 1459 | 1416 |
| FrontierMath (Tiers 1-3) | 46.3% | — |
| FrontierMath Tier 4 | 17.1% | — |
| OTIS Mock AIME 2024-2025 | 90% | — |
| ProofBench | 6% | — |
Knowledge Inkling-Small leads
Inkling-Small: 48.2 (#77), Solar Pro4: 39.8 (#129)
| Benchmark | Inkling-Small | Solar Pro4 |
|---|---|---|
| LMArena Expert | 1442 | 1427 |
| GPQA Diamond | 88.5% | — |
| SimpleQA Verified | 19.1% | — |
Multimodal Not comparable
Inkling-Small: 39.1 (#62), Solar Pro4: —
| Benchmark | Inkling-Small | Solar Pro4 |
|---|---|---|
| LMArena Vision | 1235 | — |
Multilingual Inkling-Small leads
Inkling-Small: 51.7 (#104), Solar Pro4: 48.7 (#139)
| Benchmark | Inkling-Small | Solar Pro4 |
|---|---|---|
| LMArena Non-English | 1402 | 1361 |
| LMArena Chinese | 1465 | 1415 |
| LMArena French | 1436 | 1397 |
| LMArena German | 1405 | 1364 |
| LMArena Japanese | 1405 | 1309 |
| LMArena Korean | 1363 | 1382 |
| LMArena Russian | 1391 | 1360 |
| LMArena Spanish | 1428 | 1401 |
Instruction Following Inkling-Small leads
Inkling-Small: 73.8 (#114), Solar Pro4: 72.7 (#132)
| Benchmark | Inkling-Small | Solar Pro4 |
|---|---|---|
| LMArena Instruction Following | 1399 | 1377 |
Long Context Too close to call
Inkling-Small: 42.7 (#118), Solar Pro4: 42.1 (#130)
| Benchmark | Inkling-Small | Solar Pro4 |
|---|---|---|
| LMArena Longer Query | 1401 | 1381 |
Writing & Preference Inkling-Small leads
Inkling-Small: 59.6 (#107), Solar Pro4: 56.5 (#138)
| Benchmark | Inkling-Small | Solar Pro4 |
|---|---|---|
| LMArena Text | 1414 | 1386 |
| LMArena Creative Writing | 1331 | 1316 |
| LMArena Multi-Turn | 1418 | 1385 |
| EQ-Bench Creative Writing | 1491 | — |
Frequently asked questions
Is Inkling-Small better than Solar Pro4?
Inkling-Small is the stronger model overall, scoring 46.5 to 42.1 on the Noometry Index.
Which is cheaper, Inkling-Small or Solar Pro4?
Solar Pro4 is cheaper. It lists at $0.30 per million input tokens and $1.20 per million output tokens; Inkling-Small lists at $0.45 and $1.20.
Is Inkling-Small or Solar Pro4 better for coding?
Inkling-Small scores higher on coding benchmarks: 43.6 versus 40.1 in the Noometry coding category.
Which has the bigger context window?
Both accept 524K tokens.
How many benchmarks do Inkling-Small and Solar Pro4 share?
18 benchmarks have published results for both models. Inkling-Small has 33 scored results on Noometry and Solar Pro4 has 18.