Solar Pro 2

Jul 2025
Solar Pro 2
Compare in
on
—per task?
$0.15 / $0.60per 1M in / out
—output speed?
66Kcontext

Rankingat high effort?

Strong at

C
Tool calling#151 of 242Reasoning#218 of 334Science#191 of 312Knowledge#240 of 318Instructions#170 of 245

Alternatives?

ModelScoreCostPer taskWhat changes
CheaperClaude Haiku 5.5max+66.6-24%$0.21Remove sampling parameters+5BetterGPT-6 Lunalow+46.7-24%$0.005Function calling only with none · Chat Completions+3OpenMuse Spark Openxhigh+80.5+662%$0.84Reasoning off leaves output unchanged · Self-hosted / llama.cpp+1CheaperGLM 5.3 FlashmaxOpen+63.4-10%$0.28Defaults to max · Self-hosted+4CheaperNemotron 3.5 Super VLOpen+51.7-33%$0.19

History

4 versions
0246810Jul 25Oct 25Jan 26Apr 26Jul 26Release dateAA Omniscience Index2 · Jul34
0246810Jul 25Jan 26Jul 26Release dateAA Omniscience Index2 · Jul34

Benchmarks

all categories
Chat & Knowledge
Humanity's Last Exam7.4#220
AA Omniscience Index-55.9#241
CritPt (physics)0#180
AA Intelligence Index 4.3.2≈7.5#264
AA Omniscience · Accuracy20#156
AA Omniscience · Hallucination Rate94.7#302
GPQA Diamond68.7#193
AIME 2025 · AA archived61.3#78
Coding
Terminal-Bench Hard (version unstated)3#178
LiveCodeBench · AA archived61.6#71
Agents & Tool Use
τ²-bench · AA28.1#153
Writing & Language
IFBench (instructions)37.1#172

FAQ

How much does Solar Pro 2 cost?›

$0.15 per 1M input tokens and $0.60 per 1M output tokens.

Is Solar Pro 2 free to use?›

There is no free API; the cheapest paid price is $0.15 per 1M input tokens.

How good is Solar Pro 2, and what is it best at?›

#218 of 334 in Chat & Knowledge, #176 of 239 in Coding, #151 of 242 in Agents & Tool Use, #170 of 245 in Writing & Language.

Is Solar Pro 2 better than Phi 4?›

On AA Omniscience Index, Solar Pro 2 scores -55.9 vs -55.7 — about the same.

How can I use Solar Pro 2?›

Through the API of Upstage.

What is the context window of Solar Pro 2?›

66K tokens.

When was Solar Pro 2 released? Is there a newer version?›

Released 2025-07-09. It has been superseded by Solar Pro 3.

Is Solar Pro 2 open source?›

No, Solar Pro 2 is a closed model available through an API. The closest open-weights option here is Muse Spark Open.

Can Solar Pro 2 read images?›

No, it accepts text only.

What is Solar Pro 2?›

Solar Pro 2 is a closed language model from Upstage, released Jul 2025, the successor to Solar Pro 2 (Preview).

What are the best alternatives to Solar Pro 2?›

Claude Haiku 5.5 (cheaper), GPT-6 Luna (better), Muse Spark Open (open weights).