Model comparison
Inkling vs Solar Pro4
Inkling is the stronger model overall, scoring 44.1 to 42.1 on the Noometry Index. Solar Pro4 costs 4.9× less per token, which makes it the better buy when Inkling's lead doesn't matter for your workload.
Last verified . 18 shared benchmarks.
UpstageSummary
- They share 18 benchmarks with published results for both. Inkling scores higher in 6 categories and Solar Pro4 in 2 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Inkling leads 55.1 to 39.8.
- Solar Pro4 is cheaper at $0.30 / $1.20 per million input/output tokens, against $1.87 / $4.68 for Inkling.
- Solar Pro4 accepts more context: 524K tokens versus 66K.
- Inkling has downloadable open weights; the other is API-only.
Side by side
| Inkling | Solar Pro4 | |
|---|---|---|
| Provider | Thinking Machines Lab | Upstage |
| Noometry Index | 44.1 | 42.1 |
| Released | 2026-07-15 | 2026-08-06 |
| Weights | Open | Proprietary |
| Context window | 66K | 524K |
| Max output | 66K | 131K |
| Input $ / M tokens | $1.87 | $0.30 |
| Output $ / M tokens | $4.68 | $1.20 |
| Results tracked | 41 | 18 |
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Category by category
Coding Solar Pro4 leads
Inkling: 34.5 (#234), Solar Pro4: 40.1 (#149)
| Benchmark | Inkling | Solar Pro4 |
|---|---|---|
| LMArena WebDev | 1413 | 1371 |
| LMArena Coding | 1464 | 1437 |
| FrontierCode | 14% | — |
| FrontierSWE | 4.1% | — |
| SciCode | 47% | — |
| WeirdML | 32.3% | — |
| ALE-Bench | 946 | — |
Agentic & Tool Use Not comparable
Inkling: 29.6 (#85), Solar Pro4: —
| Benchmark | Inkling | Solar Pro4 |
|---|---|---|
| APEX-Agents | 33.8% | — |
| τ²-bench Banking | 25% | — |
Reasoning Inkling leads
Inkling: 40.4 (#56), Solar Pro4: 28.5 (#104)
| Benchmark | Inkling | Solar Pro4 |
|---|---|---|
| LMArena Hard Prompts | 1451 | 1399 |
| 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 Solar Pro4 leads
Inkling: 31.3 (#225), Solar Pro4: 38.8 (#128)
| Benchmark | Inkling | Solar Pro4 |
|---|---|---|
| LMArena Math | 1479 | 1416 |
| 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), Solar Pro4: 39.8 (#129)
| Benchmark | Inkling | Solar Pro4 |
|---|---|---|
| LMArena Expert | 1465 | 1427 |
| GPQA Diamond | 88.3% | — |
| SimpleQA Verified | 40.3% | — |
Multilingual Inkling leads
Inkling: 54.0 (#52), Solar Pro4: 48.7 (#139)
| Benchmark | Inkling | Solar Pro4 |
|---|---|---|
| LMArena Non-English | 1434 | 1361 |
| LMArena Chinese | 1490 | 1415 |
| LMArena French | 1458 | 1397 |
| LMArena German | 1446 | 1364 |
| LMArena Japanese | 1429 | 1309 |
| LMArena Korean | 1404 | 1382 |
| LMArena Russian | 1429 | 1360 |
| LMArena Spanish | 1448 | 1401 |
Instruction Following Inkling leads
Inkling: 75.1 (#71), Solar Pro4: 72.7 (#132)
| Benchmark | Inkling | Solar Pro4 |
|---|---|---|
| LMArena Instruction Following | 1426 | 1377 |
Long Context Inkling leads
Inkling: 43.8 (#86), Solar Pro4: 42.1 (#130)
| Benchmark | Inkling | Solar Pro4 |
|---|---|---|
| LMArena Longer Query | 1434 | 1381 |
Writing & Preference Inkling leads
Inkling: 65.2 (#51), Solar Pro4: 56.5 (#138)
| Benchmark | Inkling | Solar Pro4 |
|---|---|---|
| LMArena Text | 1441 | 1386 |
| LMArena Creative Writing | 1387 | 1316 |
| LMArena Multi-Turn | 1436 | 1385 |
| EQ-Bench Creative Writing | 1611 | — |
| EQ-Bench 4 | 1226 | — |
Frequently asked questions
Is Inkling better than Solar Pro4?
Inkling is the stronger model overall, scoring 44.1 to 42.1 on the Noometry Index. Solar Pro4 costs 4.9× less per token, which makes it the better buy when Inkling's lead doesn't matter for your workload.
Which is cheaper, Inkling or Solar Pro4?
Solar Pro4 is cheaper. It lists at $0.30 per million input tokens and $1.20 per million output tokens; Inkling lists at $1.87 and $4.68.
Is Inkling or Solar Pro4 better for coding?
Solar Pro4 scores higher on coding benchmarks: 40.1 versus 34.5 in the Noometry coding category.
Which has the bigger context window?
Solar Pro4 does, with 524K tokens against 66K.
How many benchmarks do Inkling and Solar Pro4 share?
18 benchmarks have published results for both models. Inkling has 41 scored results on Noometry and Solar Pro4 has 18.