# Inkling vs Solar Pro4

> Inkling is the stronger model overall, scoring 44.1 to 41.5 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.

- Canonical page: https://noometry.com/compare/inkling-vs-solar-pro4
- Last updated: 2026-10-10
- Shared benchmarks: 18

## Summary

- 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 55.2 to 39.0.
- 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.

## Snapshot

| | Inkling | Solar Pro4 |
|---|---|---|
| Provider | Thinking Machines Lab | Upstage |
| Noometry Index | 44.1 | 41.5 |
| Rank | 75 | 123 |
| Context | 66K | 524K |
| Input $/M | $1.87 | $0.30 |
| Output $/M | $4.68 | $1.20 |
| Weights | Open | Proprietary |

## Coding

- Inkling: 34.1 (#229)
- Solar Pro4: 39.9 (#135)

| Benchmark | Inkling | Solar Pro4 |
|---|---|---|
| LMArena WebDev | 1412 | 1371 |
| LMArena Coding | 1463 | 1439 |
| FrontierCode | 14% | — |
| FrontierSWE | 4.1% | — |
| SciCode | 47% | — |
| WeirdML | 32.3% | — |
| ALE-Bench | 946 | — |

## Agentic & Tool Use

- Inkling: 29.5 (#76)
- Solar Pro4: —

| Benchmark | Inkling | Solar Pro4 |
|---|---|---|
| APEX-Agents | 33.8% | — |
| τ²-bench Banking | 25% | — |

## Reasoning

- Inkling: 40.6 (#48)
- Solar Pro4: 27.3 (#107)

| Benchmark | Inkling | Solar Pro4 |
|---|---|---|
| LMArena Hard Prompts | 1452 | 1398 |
| 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 | 148.6 | — |

## Math

- Inkling: 31.2 (#198)
- Solar Pro4: 36.1 (#129)

| Benchmark | Inkling | Solar Pro4 |
|---|---|---|
| LMArena Math | 1482 | 1418 |
| FrontierMath (Tiers 1-3) | 33.3% | — |
| FrontierMath Tier 4 | 4.9% | — |
| OTIS Mock AIME 2024-2025 | 88.9% | — |
| ProofBench | 0% | — |

## Knowledge

- Inkling: 55.2 (#44)
- Solar Pro4: 39.0 (#128)

| Benchmark | Inkling | Solar Pro4 |
|---|---|---|
| LMArena Expert | 1468 | 1421 |
| GPQA Diamond | 88.3% | — |
| SimpleQA Verified | 40.3% | — |

## Multilingual

- Inkling: 54.2 (#49)
- Solar Pro4: 49.0 (#134)

| Benchmark | Inkling | Solar Pro4 |
|---|---|---|
| LMArena Non-English | 1434 | 1362 |
| LMArena Chinese | 1495 | 1417 |
| LMArena French | 1453 | 1403 |
| LMArena German | 1456 | 1351 |
| LMArena Japanese | 1428 | 1300 |
| LMArena Korean | 1401 | 1383 |
| LMArena Russian | 1430 | 1360 |
| LMArena Spanish | 1442 | 1408 |

## Instruction Following

- Inkling: 75.3 (#65)
- Solar Pro4: 72.8 (#128)

| Benchmark | Inkling | Solar Pro4 |
|---|---|---|
| LMArena Instruction Following | 1427 | 1376 |

## Long Context

- Inkling: 43.9 (#79)
- Solar Pro4: 42.0 (#125)

| Benchmark | Inkling | Solar Pro4 |
|---|---|---|
| LMArena Longer Query | 1436 | 1379 |

## Writing & Preference

- Inkling: 65.5 (#48)
- Solar Pro4: 56.7 (#133)

| Benchmark | Inkling | Solar Pro4 |
|---|---|---|
| LMArena Text | 1443 | 1386 |
| LMArena Creative Writing | 1390 | 1313 |
| LMArena Multi-Turn | 1436 | 1391 |
| EQ-Bench Creative Writing | 1611 | — |
| EQ-Bench 4 | 1226 | — |

## FAQ

### Is Inkling better than Solar Pro4?

Inkling is the stronger model overall, scoring 44.1 to 41.5 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: 39.9 versus 34.1 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.