Solar Pro 4
UpstageProprietaryReleased Aug 6, 2026
On the arena.ai Agents leaderboard, Solar Pro 4 has a Net Improvement of -22.60% (—, rank #59, 95% interval -24.78%–-20.41%). Solar Pro 4 ranks #185 on the LMArena Text leaderboard (style control) with an Arena score of 1387.5 (±5.1, 27,067 votes). Artificial Analysis Intelligence Index: 14.2. API price: $0.30 input / $1.20 output per 1M tokens. Context: 524K. Nearest rivals: Inkling Small (1405.4) above and Qwen3 Coder 480B (1387.4) below.
Quick answer
- Agents leaderboard
- #59 of 56 · -22.60% success
- Text (LMArena)
- #185 · 1387.5
- 17NAS overall
- #55 of 55
- API price (in / out)
- $0.30 / $1.20 per 1M tokens
- Closest rival
- Inkling Small · 1405.4
- Data updated
- Nov 15, 2026 · synced daily
Sources: arena.ai, LMArena, Artificial Analysis, OpenRouter
Key metrics
Models ranked nearby
Sorted by Arena score| # | Model | Arena | Intel. | Output $ | tok/s |
|---|---|---|---|---|---|
| 74 |  Mistral Large 4 | 1420.4 | 26.1 | $2.10 | 95 |
| 75 | TInkling 2 Small | 1411.8 | 30.6 | $1.00 | 103 |
| 76 | TInkling Small | 1405.4 | 12.9 | $1.20 | 199 |
| 77 | USolar Pro 4This page | 1387.5 | 14.2 | $1.20 | 79 |
| 78 |  Qwen3 Coder 480B | 1387.4 | – | $1.00 | – |
| 79 | Qwen2.5 72B | 1302.9 | – | $0.50 | 31 |
| 80 | Qwen2.5 Coder 32B | 1270.7 | – | $1.00 | – |
Pricing
- Official API list price: $0.30 input and $1.20 output per 1M tokens (USD).
- At a typical 3:1 input-to-output ratio, the blended cost is about $0.53 per 1M tokens.
- Among 95 models with an output price, it is the #22 cheapest.
- The cheapest OpenRouter route charges $0.15 input / $0.60 output.
Sources & methodology
On the arena.ai Agents leaderboard, Solar Pro 4 has a Net Improvement of -22.60% (—, rank #59, 95% interval -24.78%–-20.41%).
- arena.ai Agents — agent Net Improvement, 95% interval, sessions and rank (via the public Hugging Face dataset, CC BY 4.0).
- LMArena — Arena score (Text leaderboard with style control, the same view arena.ai shows by default), 95% confidence interval, votes and rank.
- Artificial Analysis — Intelligence / Coding Index, output speed and latency (medians).
- OpenRouter — Route prices, context length and listing date.
Arena scores use the Bradley-Terry model (not Elo); ± is the half-width of the 95% confidence interval. Latency figures are Artificial Analysis medians; for reasoning models, time to first token and to first answer include the thinking phase. Data syncs daily at 14:20 (UTC+8).
Limits: Arena scores come from anonymous users voting on chats, so they reflect conversational preference rather than agent or coding benchmarks; with few votes the interval is wide and ranks move. Prices and speeds change as providers update them.
FAQ
How does Solar Pro 4 do on the Agents leaderboard?
On the arena.ai Agents leaderboard, Solar Pro 4 has a Net Improvement of -22.60% (—, rank #59, 95% interval -24.78%–-20.41%).
What rank is Solar Pro 4 right now?
Solar Pro 4 is #77 on our leaderboard of 80 scored models (Arena score 1387.5); its raw LMArena rank is #185.
What does Solar Pro 4 cost via API?
Input $0.30 / output $1.20 per 1M tokens (official API list price; the OpenRouter quote when no official price is available). At a typical 3:1 input-to-output ratio, the blended cost is about $0.53 per 1M tokens.
How fast is Solar Pro 4?
Artificial Analysis measures about 79 output tokens per second, 1.9 s to the first token and 27 s to the first answer token; it is a reasoning model, so latency includes thinking time.
How close is Solar Pro 4 to the models ranked next to it?
It is 17.9 points behind Inkling Small (1405.4) and 0.1 points ahead of Qwen3 Coder 480B (1387.4); gaps smaller than the confidence interval (±5.1) are not significant.
Is Solar Pro 4 open source? Can it be self-hosted?
Solar Pro 4 is a closed model, available only via official APIs or hosted services.
What is the context length of Solar Pro 4?
524K (524,288 tokens, as listed on OpenRouter).
Solar Pro 4 vs Inkling Small: which is better?
On the LMArena Text leaderboard Solar Pro 4 scores 1387.5 and Inkling Small scores 1405.4 (a 17.9-point gap). Agent task success: Solar Pro 4 -22.60%, Inkling Small -18.06%. On price, Solar Pro 4 costs $1.20 and Inkling Small $1.20 per 1M output tokens.
Is there a cheaper model close to Solar Pro 4?
Among models within 15 Text points, none is currently more than 30% cheaper than Solar Pro 4 on output price.
Where does the Solar Pro 4 data come from and how often is it updated?
Agent success rates come from the arena.ai Agents leaderboard (CC BY 4.0), Text scores from LMArena, intelligence and speed from Artificial Analysis, and prices and context from official list prices and OpenRouter. 17NAS syncs daily at 06:20 UTC; this page was last updated Nov 15, 2026.