Model comparison
Devstral Small 2505 vs Solar Pro4
Solar Pro4 is the stronger model overall, scoring 41.5 to 33.9 on the Noometry Index. Devstral Small 2505 costs 3.5× less per token, which makes it the better buy when Solar Pro4's lead doesn't matter for your workload.
Last verified . 0 shared benchmarks.
Mistral AI
UpstageSummary
- The widest gap is in reasoning, where Solar Pro4 leads 27.3 to 19.1.
- Devstral Small 2505 is cheaper at $0.10 / $0.30 per million input/output tokens, against $0.30 / $1.20 for Solar Pro4.
- Solar Pro4 accepts more context: 524K tokens versus 128K.
- Devstral Small 2505 has downloadable open weights; the other is API-only.
Side by side
| Devstral Small 2505 | Solar Pro4 | |
|---|---|---|
| Provider | Mistral AI | Upstage |
| Noometry Index | 33.9 | 41.5 |
| Released | 2025-05-07 | 2026-08-06 |
| Weights | Open | Proprietary |
| Context window | 128K | 524K |
| Max output | 128K | 131K |
| Input $ / M tokens | $0.10 | $0.30 |
| Output $ / M tokens | $0.30 | $1.20 |
| Results tracked | 4 | 18 |
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Category by category
Coding Solar Pro4 leads
Devstral Small 2505: 38.6 (#160), Solar Pro4: 39.9 (#135)
| Benchmark | Devstral Small 2505 | Solar Pro4 |
|---|---|---|
| SWE-bench Verified (bash only) | 56.4% | — |
| LMArena WebDev | — | 1371 |
| SciCode | 28.8% | — |
| LMArena Coding | — | 1439 |
Reasoning Solar Pro4 leads
Devstral Small 2505: 19.1 (#243), Solar Pro4: 27.3 (#107)
| Benchmark | Devstral Small 2505 | Solar Pro4 |
|---|---|---|
| Kagi LLM Benchmark | 37.7% | — |
| CritPt | 0% | — |
| LMArena Hard Prompts | — | 1398 |
Math Not comparable
Devstral Small 2505: —, Solar Pro4: 36.1 (#129)
| Benchmark | Devstral Small 2505 | Solar Pro4 |
|---|---|---|
| LMArena Math | — | 1418 |
Knowledge Not comparable
Devstral Small 2505: —, Solar Pro4: 39.0 (#128)
| Benchmark | Devstral Small 2505 | Solar Pro4 |
|---|---|---|
| LMArena Expert | — | 1421 |
Multilingual Not comparable
Devstral Small 2505: —, Solar Pro4: 49.0 (#134)
| Benchmark | Devstral Small 2505 | Solar Pro4 |
|---|---|---|
| LMArena Non-English | — | 1362 |
| LMArena Chinese | — | 1417 |
| LMArena French | — | 1403 |
| LMArena German | — | 1351 |
| LMArena Japanese | — | 1300 |
| LMArena Korean | — | 1383 |
| LMArena Russian | — | 1360 |
| LMArena Spanish | — | 1408 |
Instruction Following Not comparable
Devstral Small 2505: —, Solar Pro4: 72.8 (#128)
| Benchmark | Devstral Small 2505 | Solar Pro4 |
|---|---|---|
| LMArena Instruction Following | — | 1376 |
Long Context Not comparable
Devstral Small 2505: —, Solar Pro4: 42.0 (#125)
| Benchmark | Devstral Small 2505 | Solar Pro4 |
|---|---|---|
| LMArena Longer Query | — | 1379 |
Writing & Preference Not comparable
Devstral Small 2505: —, Solar Pro4: 56.7 (#133)
| Benchmark | Devstral Small 2505 | Solar Pro4 |
|---|---|---|
| LMArena Text | — | 1386 |
| LMArena Creative Writing | — | 1313 |
| LMArena Multi-Turn | — | 1391 |
Frequently asked questions
Is Devstral Small 2505 better than Solar Pro4?
Solar Pro4 is the stronger model overall, scoring 41.5 to 33.9 on the Noometry Index. Devstral Small 2505 costs 3.5× less per token, which makes it the better buy when Solar Pro4's lead doesn't matter for your workload.
Which is cheaper, Devstral Small 2505 or Solar Pro4?
Devstral Small 2505 is cheaper. It lists at $0.10 per million input tokens and $0.30 per million output tokens; Solar Pro4 lists at $0.30 and $1.20.
Is Devstral Small 2505 or Solar Pro4 better for coding?
Solar Pro4 scores higher on coding benchmarks: 39.9 versus 38.6 in the Noometry coding category.
Which has the bigger context window?
Solar Pro4 does, with 524K tokens against 128K.
How many benchmarks do Devstral Small 2505 and Solar Pro4 share?
0 benchmarks have published results for both models. Devstral Small 2505 has 4 scored results on Noometry and Solar Pro4 has 18.