Model comparison
Grok 4.20 (Non-Reasoning) vs Solar Pro4
Grok 4.20 (Non-Reasoning) is the stronger model overall, scoring 48.5 to 41.5 on the Noometry Index. Solar Pro4 costs 3.0× less per token, which makes it the better buy when Grok 4.20 (Non-Reasoning)'s lead doesn't matter for your workload.
Last verified . 18 shared benchmarks.
UpstageSummary
- They share 18 benchmarks with published results for both. Grok 4.20 (Non-Reasoning) 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 4.20 (Non-Reasoning) leads 52.2 to 27.3.
- Solar Pro4 is cheaper at $0.30 / $1.20 per million input/output tokens, against $1.25 / $2.50 for Grok 4.20 (Non-Reasoning).
- Grok 4.20 (Non-Reasoning) accepts more context: 1M tokens versus 524K.
Side by side
| Grok 4.20 (Non-Reasoning) | Solar Pro4 | |
|---|---|---|
| Provider | xAI | Upstage |
| Noometry Index | 48.5 | 41.5 |
| Released | 2026-02-17 | 2026-08-06 |
| Weights | Proprietary | Proprietary |
| Context window | 1M | 524K |
| Max output | 30K | 131K |
| Input $ / M tokens | $1.25 | $0.30 |
| Output $ / M tokens | $2.50 | $1.20 |
| Results tracked | 46 | 18 |
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Category by category
Coding Grok 4.20 (Non-Reasoning) leads
Grok 4.20 (Non-Reasoning): 41.8 (#104), Solar Pro4: 39.9 (#135)
| Benchmark | Grok 4.20 (Non-Reasoning) | Solar Pro4 |
|---|---|---|
| LMArena WebDev | 1374 | 1371 |
| LMArena Coding | 1458 | 1439 |
| WeirdML | 52.3% | — |
| ALE-Bench | 1,150 | — |
Agentic & Tool Use Not comparable
Grok 4.20 (Non-Reasoning): 34.3 (#43), Solar Pro4: —
| Benchmark | Grok 4.20 (Non-Reasoning) | Solar Pro4 |
|---|---|---|
| Terminal-Bench | 57.3% | — |
| τ²-bench Banking | 18% | — |
| LMArena Search | 1189 | — |
| Vending-Bench 2 | 4,663 | — |
Reasoning Grok 4.20 (Non-Reasoning) leads
Grok 4.20 (Non-Reasoning): 52.2 (#30), Solar Pro4: 27.3 (#107)
| Benchmark | Grok 4.20 (Non-Reasoning) | Solar Pro4 |
|---|---|---|
| LMArena Hard Prompts | 1451 | 1398 |
| ARC-AGI-2 | 65.1% | — |
| Kagi LLM Benchmark | 75% | — |
| NYT Connections (extended) | 85.4% | — |
| ARC-AGI-1 | 89.5% | — |
| Chess Puzzles | 24% | — |
| Thematic Generalization | 63.8% | — |
| DTBench | 90.1% | — |
| LMCA | 38.7% | — |
| Epoch Capabilities Index | 152.01 | — |
| ForecastBench | 61.4 | — |
Math Grok 4.20 (Non-Reasoning) leads
Grok 4.20 (Non-Reasoning): 48.0 (#54), Solar Pro4: 36.1 (#129)
| Benchmark | Grok 4.20 (Non-Reasoning) | Solar Pro4 |
|---|---|---|
| LMArena Math | 1455 | 1418 |
| FrontierMath (Tiers 1-3) | 44.9% | — |
| FrontierMath Tier 4 | 17.1% | — |
| OTIS Mock AIME 2024-2025 | 92.2% | — |
| ProofBench | 14% | — |
Knowledge Grok 4.20 (Non-Reasoning) leads
Grok 4.20 (Non-Reasoning): 52.8 (#54), Solar Pro4: 39.0 (#128)
| Benchmark | Grok 4.20 (Non-Reasoning) | Solar Pro4 |
|---|---|---|
| LMArena Expert | 1440 | 1421 |
| GPQA Diamond | 89.3% | — |
| SimpleQA Verified | 30.2% | — |
Multimodal Not comparable
Grok 4.20 (Non-Reasoning): 33.2 (#88), Solar Pro4: —
| Benchmark | Grok 4.20 (Non-Reasoning) | Solar Pro4 |
|---|---|---|
| LMArena Vision | 1263 | — |
| Blueprint-Bench 2 | 0% | — |
| LMArena Document | 1416 | — |
Multilingual Grok 4.20 (Non-Reasoning) leads
Grok 4.20 (Non-Reasoning): 54.7 (#38), Solar Pro4: 49.0 (#134)
| Benchmark | Grok 4.20 (Non-Reasoning) | Solar Pro4 |
|---|---|---|
| LMArena Non-English | 1440 | 1362 |
| LMArena Chinese | 1481 | 1417 |
| LMArena French | 1477 | 1403 |
| LMArena German | 1463 | 1351 |
| LMArena Japanese | 1450 | 1300 |
| LMArena Korean | 1417 | 1383 |
| LMArena Russian | 1457 | 1360 |
| LMArena Spanish | 1442 | 1408 |
Instruction Following Grok 4.20 (Non-Reasoning) leads
Grok 4.20 (Non-Reasoning): 75.0 (#79), Solar Pro4: 72.8 (#128)
| Benchmark | Grok 4.20 (Non-Reasoning) | Solar Pro4 |
|---|---|---|
| LMArena Instruction Following | 1420 | 1376 |
Long Context Grok 4.20 (Non-Reasoning) leads
Grok 4.20 (Non-Reasoning): 45.4 (#33), Solar Pro4: 42.0 (#125)
| Benchmark | Grok 4.20 (Non-Reasoning) | Solar Pro4 |
|---|---|---|
| LMArena Longer Query | 1436 | 1379 |
| CL-bench | 22.2% | — |
| CL-bench Life | 11.9% | — |
Writing & Preference Grok 4.20 (Non-Reasoning) leads
Grok 4.20 (Non-Reasoning): 65.9 (#42), Solar Pro4: 56.7 (#133)
| Benchmark | Grok 4.20 (Non-Reasoning) | Solar Pro4 |
|---|---|---|
| LMArena Text | 1451 | 1386 |
| LMArena Creative Writing | 1439 | 1313 |
| LMArena Multi-Turn | 1456 | 1391 |
| EQ-Bench Creative Writing | 1574 | — |
Frequently asked questions
Is Grok 4.20 (Non-Reasoning) better than Solar Pro4?
Grok 4.20 (Non-Reasoning) is the stronger model overall, scoring 48.5 to 41.5 on the Noometry Index. Solar Pro4 costs 3.0× less per token, which makes it the better buy when Grok 4.20 (Non-Reasoning)'s lead doesn't matter for your workload.
Which is cheaper, Grok 4.20 (Non-Reasoning) or Solar Pro4?
Solar Pro4 is cheaper. It lists at $0.30 per million input tokens and $1.20 per million output tokens; Grok 4.20 (Non-Reasoning) lists at $1.25 and $2.50.
Is Grok 4.20 (Non-Reasoning) or Solar Pro4 better for coding?
Grok 4.20 (Non-Reasoning) scores higher on coding benchmarks: 41.8 versus 39.9 in the Noometry coding category.
Which has the bigger context window?
Grok 4.20 (Non-Reasoning) does, with 1M tokens against 524K.
How many benchmarks do Grok 4.20 (Non-Reasoning) and Solar Pro4 share?
18 benchmarks have published results for both models. Grok 4.20 (Non-Reasoning) has 46 scored results on Noometry and Solar Pro4 has 18.