Model comparison
Grok 4.5 vs Solar Pro4
Grok 4.5 is the stronger model overall, scoring 55.0 to 41.5 on the Noometry Index. Solar Pro4 costs 5.7× less per token, which makes it the better buy when Grok 4.5's lead doesn't matter for your workload.
Last verified . 18 shared benchmarks.
UpstageSummary
- They share 18 benchmarks with published results for both. Grok 4.5 scores higher in 8 categories and Solar Pro4 in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.5 leads 56.0 to 27.3.
- Solar Pro4 is cheaper at $0.30 / $1.20 per million input/output tokens, against $2 / $6 for Grok 4.5.
- Solar Pro4 accepts more context: 524K tokens versus 500K.
Side by side
| Grok 4.5 | Solar Pro4 | |
|---|---|---|
| Provider | xAI | Upstage |
| Noometry Index | 55.0 | 41.5 |
| Released | 2026-07-08 | 2026-08-06 |
| Weights | Proprietary | Proprietary |
| Context window | 500K | 524K |
| Max output | 500K | 131K |
| Input $ / M tokens | $2 | $0.30 |
| Output $ / M tokens | $6 | $1.20 |
| Results tracked | 52 | 18 |
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Category by category
Coding Grok 4.5 leads
Grok 4.5: 51.7 (#34), Solar Pro4: 39.9 (#135)
| Benchmark | Grok 4.5 | Solar Pro4 |
|---|---|---|
| LMArena WebDev | 1552 | 1371 |
| LMArena Coding | 1473 | 1439 |
| DeepSWE | 53.8% | — |
| FrontierCode | 42.4% | — |
| SciCode | 54.1% | — |
| WeirdML | 46.4% | — |
| ALE-Bench | 1,309 | — |
Agentic & Tool Use Not comparable
Grok 4.5: 44.4 (#15), Solar Pro4: —
| Benchmark | Grok 4.5 | Solar Pro4 |
|---|---|---|
| APEX-Agents | 56.2% | — |
| τ²-bench Banking | 47.9% | — |
| PostTrainBench | 23.4% | — |
| GBAEval | 65.4% | — |
| GDP.pdf | 14% | — |
| LMArena Search | 1213 | — |
| Vending-Bench 2 | 3,887 | — |
Reasoning Grok 4.5 leads
Grok 4.5: 56.0 (#23), Solar Pro4: 27.3 (#107)
| Benchmark | Grok 4.5 | Solar Pro4 |
|---|---|---|
| LMArena Hard Prompts | 1462 | 1398 |
| ARC-AGI-2 | 52.6% | — |
| SimpleBench | 70% | — |
| Kagi LLM Benchmark | 83.5% | — |
| NYT Connections (extended) | 79.9% | — |
| ARC-AGI-1 | 87.2% | — |
| CritPt | 15.4% | — |
| Chess Puzzles | 36% | — |
| DTBench | 96.5% | — |
| LMCA | 45.2% | — |
| Surface Evolver Bench | 74.4% | — |
| Epoch Capabilities Index | 154.02 | — |
Math Grok 4.5 leads
Grok 4.5: 60.7 (#29), Solar Pro4: 36.1 (#129)
| Benchmark | Grok 4.5 | Solar Pro4 |
|---|---|---|
| LMArena Math | 1457 | 1418 |
| FrontierMath (Tiers 1-3) | 57.2% | — |
| FrontierMath Tier 4 | 24.4% | — |
| OTIS Mock AIME 2024-2025 | 97.8% | — |
| ProofBench | 31% | — |
Knowledge Grok 4.5 leads
Grok 4.5: 62.3 (#21), Solar Pro4: 39.0 (#128)
| Benchmark | Grok 4.5 | Solar Pro4 |
|---|---|---|
| LMArena Expert | 1466 | 1421 |
| GPQA Diamond | 93.4% | — |
| SimpleQA Verified | 48.3% | — |
Multimodal Not comparable
Grok 4.5: 37.8 (#63), Solar Pro4: —
| Benchmark | Grok 4.5 | Solar Pro4 |
|---|---|---|
| LMArena Vision | 1287 | — |
| Blueprint-Bench 2 | 27.3% | — |
| Furniture Assembly | 22.5% | — |
| LMArena Document | 1452 | — |
Multilingual Grok 4.5 leads
Grok 4.5: 54.5 (#43), Solar Pro4: 49.0 (#134)
| Benchmark | Grok 4.5 | Solar Pro4 |
|---|---|---|
| LMArena Non-English | 1439 | 1362 |
| LMArena Chinese | 1497 | 1417 |
| LMArena French | 1458 | 1403 |
| LMArena German | 1448 | 1351 |
| LMArena Japanese | 1425 | 1300 |
| LMArena Korean | 1402 | 1383 |
| LMArena Russian | 1447 | 1360 |
| LMArena Spanish | 1452 | 1408 |
Instruction Following Grok 4.5 leads
Grok 4.5: 76.3 (#45), Solar Pro4: 72.8 (#128)
| Benchmark | Grok 4.5 | Solar Pro4 |
|---|---|---|
| LMArena Instruction Following | 1446 | 1376 |
Long Context Grok 4.5 leads
Grok 4.5: 44.8 (#54), Solar Pro4: 42.0 (#125)
| Benchmark | Grok 4.5 | Solar Pro4 |
|---|---|---|
| LMArena Longer Query | 1463 | 1379 |
Writing & Preference Grok 4.5 leads
Grok 4.5: 65.9 (#40), Solar Pro4: 56.7 (#133)
| Benchmark | Grok 4.5 | Solar Pro4 |
|---|---|---|
| LMArena Text | 1448 | 1386 |
| LMArena Creative Writing | 1442 | 1313 |
| LMArena Multi-Turn | 1457 | 1391 |
| EQ-Bench Creative Writing | 1579 | — |
Frequently asked questions
Is Grok 4.5 better than Solar Pro4?
Grok 4.5 is the stronger model overall, scoring 55.0 to 41.5 on the Noometry Index. Solar Pro4 costs 5.7× less per token, which makes it the better buy when Grok 4.5's lead doesn't matter for your workload.
Which is cheaper, Grok 4.5 or Solar Pro4?
Solar Pro4 is cheaper. It lists at $0.30 per million input tokens and $1.20 per million output tokens; Grok 4.5 lists at $2 and $6.
Is Grok 4.5 or Solar Pro4 better for coding?
Grok 4.5 scores higher on coding benchmarks: 51.7 versus 39.9 in the Noometry coding category.
Which has the bigger context window?
Solar Pro4 does, with 524K tokens against 500K.
How many benchmarks do Grok 4.5 and Solar Pro4 share?
18 benchmarks have published results for both models. Grok 4.5 has 52 scored results on Noometry and Solar Pro4 has 18.