vs
0:9
overall capability wins (0 ties across 9 scored). Solar Pro 4 leads overall.
- Reasoning0:4
- Coding0:2
- Tool use0:1
- Pricing3:0
- Specs0:2
Verdict
Solar Pro 4 leads coding (widest gap: +45.3 on TermBench); Solar Pro 4 offers ~4.0x larger context (512K vs 128K); Solar Pro 4 allows ~15.6x more max output (128K vs 8K).
- Solar Pro 4 leads coding (widest gap: +45.3 on TermBench)
- Solar Pro 4 offers ~4.0x larger context (512K vs 128K)
- Solar Pro 4 allows ~15.6x more max output (128K vs 8K)
- Solar Pro 3 ships open weights (Apache 2.0)
- Solar Pro 3 is ~2.0x cheaper on a blended token basis than Solar Pro 4
Cost for 1M in + 250K out
Illustrative chat workload at primary-provider list prices.
- Solar Pro 3
- $0.30
- Solar Pro 4
- $0.60
Solar Pro 3 is about 2.0x cheaper on this workload.
Price per 1M tokens
Full comparison
Organization
Upstage
Upstage
Family
Solar
Solar
License
Apache 2.0
Proprietary
Open weights
Yes
No
Release
Jan 26, 2026
Aug 10, 2026
Knowledge cutoff
-
-
API / provider
Upstage
Upstage
Modalities
text → text
text → text
Specs
Context window
128K
512K
Max output
8K
128K
Parameters
102B (12B act.)
—
Pricing
Input $/1M
$0.15
$0.30
Output $/1M
$0.60
$1.20
Blended $/1M (3∶1)
$0.26
$0.52
Speed
tok/s
90
-
TTFT (s)
0.3
-
Reasoning
MMLU-Pro
—
—
GPQA Diamond
72.4
89.1
Humanity's Last Exam
10.3
29.2
AIME 2025
—
—
MATH-500
—
—
Humanity's Last Exam (with tools)
—
—
AA-Omniscience Accuracy
18.5
18.9
AA-LCR v1.1
32.3
74.0
CritPt
—
5.4
MMMU-Pro
—
—
IFBench
71.2
—
Chartography
—
—
Chartography (With Tools)
—
—
Coding
SWE-bench Verified
—
—
SWE-bench Pro
—
—
SWE-bench Multilingual
—
—
LiveCodeBench
—
—
Terminal-Bench 2.1
12.0
57.3
Aider Polyglot
—
—
Terminal-Bench 3
—
—
BigCodeBench
—
—
SciCode
25.5
44.6
CursorBench
—
—
SWE-Rebench
—
—
NL2Repo-Bench
—
—
DeepSWE
—
—
WebDev Arena
—
1,372
Terminal-Bench 4.0
—
—
CursorBench 4.0
—
—
FrontierCode v1.1 (Main)
—
—
Arena
LMArena Elo
—
1,376
| Metric | Solar Pro 3 | Solar Pro 4 | Delta |
|---|---|---|---|
| Identity | |||
| Organization | Upstage | Upstage | — |
| Family | Solar | Solar | — |
| License | Apache 2.0 | Proprietary | — |
| Open weights | Yes | No | — |
| Release | Jan 26, 2026 | Aug 10, 2026 | — |
| Knowledge cutoff | - | - | — |
| API / provider | Upstage | Upstage | — |
| Modalities | text → text | text → text | — |
| Specs | |||
| Context window | 128K | 512K | B +384K |
| Max output | 8K | 128K | B +120K |
| Parameters | 102B (12B act.) | — | — |
| Pricing | |||
| Input $/1M | $0.15 | $0.30 | A +$0.15 |
| Output $/1M | $0.60 | $1.20 | A +$0.60 |
| Blended $/1M (3∶1) | $0.26 | $0.52 | A +$0.26 |
| Speed | |||
| tok/s | 90 | - | — |
| TTFT (s) | 0.3 | - | — |
| Reasoning | |||
| MMLU-Pro | — | — | — |
| GPQA Diamond | 72.4 | 89.1 | B +16.7 pts |
| Humanity's Last Exam | 10.3 | 29.2 | B +18.9 pts |
| AIME 2025 | — | — | — |
| MATH-500 | — | — | — |
| Humanity's Last Exam (with tools) | — | — | — |
| AA-Omniscience Accuracy | 18.5 | 18.9 | B +0.4 pts |
| AA-LCR v1.1 | 32.3 | 74.0 | B +41.7 pts |
| CritPt | — | 5.4 | — |
| MMMU-Pro | — | — | — |
| IFBench | 71.2 | — | — |
| Chartography | — | — | — |
| Chartography (With Tools) | — | — | — |
| Coding | |||
| SWE-bench Verified | — | — | — |
| SWE-bench Pro | — | — | — |
| SWE-bench Multilingual | — | — | — |
| LiveCodeBench | — | — | — |
| Terminal-Bench 2.1 | 12.0 | 57.3 | B +45.3 pts |
| Aider Polyglot | — | — | — |
| Terminal-Bench 3 | — | — | — |
| BigCodeBench | — | — | — |
| SciCode | 25.5 | 44.6 | B +19.1 pts |
| CursorBench | — | — | — |
| SWE-Rebench | — | — | — |
| NL2Repo-Bench | — | — | — |
| DeepSWE | — | — | — |
| WebDev Arena | — | 1,372 | — |
| Terminal-Bench 4.0 | — | — | — |
| CursorBench 4.0 | — | — | — |
| FrontierCode v1.1 (Main) | — | — | — |
| Arena | |||
| LMArena Elo | — | 1,376 | — |
Solar Pro 3
- Context
- 128K / 8K out
- Parameters
- 102B (12B act.)
- Price
- $0.15 / $0.60
- Speed
- 90 tok/s · 0.3s TTFT
- Modalities
- text → text
- License
- Apache 2.0
Upstage's 102B MoE (12B active) — strong Korean/English bilingual model with competitive sub-$1 blended API pricing.
Solar Pro 4
- Context
- 512K / 128K out
- Parameters
- —
- Price
- $0.30 / $1.20
- Speed
- —
- Modalities
- text → text
- License
- Proprietary
Upstage's proprietary successor to Solar Pro 3 — 512K context with up to 128K output tokens for loading multiple long documents into one session; EN/KO/JA text, released Aug 2026.
Benchmark charts
Winner bars are emphasized. Per-benchmark deltas sit above each chart.