Solar Pro 4

Aug 2026
Solar Pro 4
Compare in
on
$0.71per task?
$0.30 / $1.20per 1M in / outcache $0.06
119 tok/sfirst token in 1.7 s?
524Kcontext

Rankingin thinking mode?

Strong at

A
Reasoning#81 of 334Science#46 of 312Knowledge#71 of 318
B
Agents & work tasks#63 of 175Long context#119 of 273
C
Coding#75 of 132

Alternatives?

ModelScoreCostPer taskWhat changes
CheaperGPT-6.1 Solxhigh+92%-45%$0.39Remove unsupported parameters+5BetterGPT-6 Lunamedium+13%-98%$0.017Function calling only with none · Chat Completions+3OpenMiMo v2.6 Prothinking+74%-81%$0.13Pass back reasoning_content+3CheaperDeepSeek V4.1 Flash 1017maxOpen+70%-63%$0.26Pass back reasoning_content · Chat Completions+4CheaperGPT-6 Solxhigh+67%-27%$0.52

History

4 versions
510152025Jul 25Oct 25Jan 26Apr 26Jul 26Release dateAA Intelligence Index 4.3.22 · May2 · Jul34
510152025Jul 25Jan 26Jul 26Release dateAA Intelligence Index 4.3.22 · May2 · Jul34

Benchmarks

all categories
Chat & Knowledge
Humanity's Last Exam29.8#81
AA Omniscience Index0.3#71
CritPt (physics)6.3#73
AA Intelligence Index 4.3.226.6#71
AA Omniscience · Accuracy19.4#160
AA Omniscience · Hallucination Rate23.8#15
AA-LCR (long context) 1.170.7#119
GDP.pdf · AA all-pass7#73
GPQA Diamond89.1#46
Coding
Terminal-Bench 4.00#75
SciCode48#59
Terminal-Bench 2.157.3#57
Agents & Tool Use
AutomationBench-AA13.6#72
GDPval-AA (work tasks) 2.130.3#63
τ³-Banking · AA23.3#45
AA-Briefcase 1.1 · Elo1,093.3#47

FAQ

How much does Solar Pro 4 cost?›

$0.30 per 1M input tokens and $1.20 per 1M output tokens; cached input $0.06 per 1M. A typical benchmark task costs about $0.71 at default effort.

Is Solar Pro 4 free to use?›

There is no free API; the cheapest paid price is $0.30 per 1M input tokens.

How good is Solar Pro 4, and what is it best at?›

#81 of 334 in Chat & Knowledge, #75 of 132 in Coding, #72 of 133 in Agents & Tool Use, #124 of 195 in Writing & Language, #73 of 133 in Vision & Documents. Strongest at: Reasoning, Science, Knowledge.

Is Solar Pro 4 better than GLM 5 Turbo?›

On AA Intelligence Index 4.3.2, Solar Pro 4 scores 26.6 vs 26.6 — about the same.

How can I use Solar Pro 4?›

Through the Upstage API.

What is the context window of Solar Pro 4?›

524K tokens, with up to 131K output tokens.

When was Solar Pro 4 released? Is there a newer version?›

Released 2026-08-06. It is the current version in its line.

Is Solar Pro 4 open source?›

No, Solar Pro 4 is a closed model available through an API. The closest open-weights option here is MiMo v2.6 Pro.

Can Solar Pro 4 read images?›

No, it accepts text only.

What is Solar Pro 4?›

Solar Pro 4 is a closed language model from Upstage, released Aug 2026.

What are the best alternatives to Solar Pro 4?›

GPT-6.1 Sol (cheaper), GPT-6 Luna (better), MiMo v2.6 Pro (open weights).