Upstage model product
Solar Pro 4
Solar Pro 4 is Upstage's proprietary reasoning-focused agentic LLM (text→text) for finishing multi-step commercial work: long documents, terminal tasks, and multi-turn tool use.
Updated Aug 17, 2026. Default version: Solar Pro 4
LLMBoard Score57.3Solar Pro 4
Coverage80%9 benchmark families
Context window524.3KTokens
Official input price$0.30Upstage API
Solar Pro 4 Capability Profile
This profile uses the model's current scored version. Arena ratings and prices are shown separately.
Solar Pro 4 Benchmark Results
Benchmark scores for Solar Pro 4.
Sort by
Benchmark | Score | Rank | Participants | Percentile | Evidence | Evaluated |
|---|
| BenchmarkTau3 Banking | Score23.0% | Rank03 | Participants7 | Percentile66.7% | EvidenceC | Evaluated |
| BenchmarkAA-LCR | Score71.0% | Rank04 | Participants18 | Percentile82.3% | EvidenceC | Evaluated |
| BenchmarkLiveCodeBench | Score87.8% | Rank04 | Participants75 | Percentile96.0% | EvidenceC | Evaluated |
| BenchmarkAIME 2026 | Score95.3% | Rank07 | Participants21 | Percentile70.0% | EvidenceC | Evaluated |
| BenchmarkMMLU-Pro | Score86.3% | Rank13 | Participants134 | Percentile91.0% | EvidenceC | Evaluated |
| BenchmarkTerminal-Bench 2.1 | Score57.0% | Rank24 | Participants28 | Percentile14.8% | EvidenceC | Evaluated |
| BenchmarkGPQA | Score89.0% | Rank29 | Participants239 | Percentile88.2% | EvidenceC | Evaluated |
| BenchmarkBrowseComp | Score49.2% | Rank48 | Participants62 | Percentile22.9% | EvidenceC | Evaluated |
| BenchmarkSWE-Bench Verified | Score70.6% | Rank62 | Participants111 | Percentile44.5% | EvidenceC | Evaluated |
Solar Pro 4 Arena Results
Preference and agent-evaluation results for the default version.
Sort by
Arena | Category | Rank | Rating / score | Votes | Observations | Result date |
|---|
| Arenaagent tool hallucination | Categoryoverall | Rank34 | Rating / score0.0 | VotesN/A | Observations151K | Result date |
| Arenaagent bash recovery steps | Categoryoverall | Rank42 | Rating / score-0.1 | VotesN/A | Observations8.6K | Result date |
| Arenaagent task outcome explicit | Categoryoverall | Rank42 | Rating / score-0.1 | VotesN/A | Observations2.2K | Result date |
| Arenaagent | Categoryoverall | Rank44 | Rating / score-0.1 | VotesN/A | Observations165.8K | Result date |
| Arenaagent praise complaint | Categoryoverall | Rank47 | Rating / score-0.2 | VotesN/A | Observations805 | Result date |
| Arenaagent steerability | Categoryoverall | Rank47 | Rating / score-0.1 | VotesN/A | Observations3.2K | Result date |
| Arenawebdev | Categoryoverall | Rank75 | Rating / score1371.3 | Votes1,400 | ObservationsN/A | Result date |
| Arenatext factuality | Categoryoverall | Rank134 | Rating / score1397.5 | Votes2,433 | ObservationsN/A | Result date |
| Arenatext | Categoryoverall | Rank150 | Rating / score1378.0 | Votes2,433 | ObservationsN/A | Result date |
| Arenatext style control | Categoryoverall | Rank166 | Rating / score1377.7 | Votes2,433 | ObservationsN/A | Result date |
Solar Pro 4 Pricing
Official vendor API pricing appears first, followed by individual provider offers.
- Official API
- $0.30 input, $1.2 output per 1M
- Official provider
- Upstage
- Lowest third-party
- From $0.03 input, $0.12 output per 1M via NanoGPT
- Tracked offerings
- 5
Sort by
Provider | Provider model ID | Region | Input / 1M | Output / 1M | Context | Updated |
|---|
| ProviderNanoGPT | Provider model IDupstage/solar-pro4 | Regionglobal | Input / 1M$0.03 | Output / 1M$0.12 | Context524.3K | Updated |
| ProviderOpenRouter | Provider model IDupstage/solar-pro4 | Regionglobal | Input / 1M$0.03 | Output / 1M$0.12 | Context524.3K | Updated |
| ProviderLLMTR | Provider model IDupstage/solar-pro4 | Regionglobal | Input / 1M$0.03 | Output / 1M$0.12 | Context524.3K | Updated |
| ProviderUpstage | Provider model IDsolar-pro4 | Regionglobal | Input / 1M$0.30 | Output / 1M$1.2 | Context524.3K | Updated |
| ProviderKilo Gateway | Provider model IDupstage/solar-pro4 | Regionglobal | Input / 1M$0.30 | Output / 1M$1.2 | Context524.3K | Updated |
Official prices use only the vendor's configured official Provider and positive standard USD PAYG rates. Third-party offers remain explicitly labeled.
Solar Pro 4 Runtime Performance
Provider-specific output speed and catalog latency for Solar Pro 4. Runtime does not affect the capability score.
No runtime data
Browse runtime rankingsNo provider-specific speed or latency record is linked to the default version yet.
Output Speed is generated output tokens received per second. Catalog latency is reported separately from observed provider TTFT.
Solar Pro 4 Specifications
Technical details for the model's default version.
- Version
- Solar Pro 4
- Released
- Aug 6, 2026
- Knowledge cutoff
- Feb 1, 2026
- Parameters
- N/A
- Context window
- 524.3K
- Max output
- 131.1K
- Inputs
- text
- Outputs
- text
- Open weights
- No
- License
- Proprietary
Solar Pro 4 Versions
Available versions of this model. The score column identifies the version used in the overall ranking.
Sort by
Version | Released | LLMBoard | Parameters | Context | Max output | Open weights | License |
|---|
| VersionSolar Pro 4 | Released | LLMBoard57.3 | ParametersN/A | Context524.3K | Max output131.1K | Open weightsNo | LicenseProprietary |
Solar Pro 4 vs nearby models
Open a comparison with the three ranked models immediately above and below this model.
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What is Solar Pro 4?
Key information about Solar Pro 4 and its available data.
Solar Pro 4 is Upstage's proprietary reasoning-focused agentic LLM (text→text) for finishing multi-step commercial work: long documents, terminal tasks, and multi-turn tool use. Supports English, Korean, and Japanese with a ~512K context window (OpenRouter listing ~524K) and up to 128K output tokens.
Reasoning effort is adjustable (high for deep analysis, low for fast chat). 3. 8 does not fit that encoding (no gdpval-aa-v2 id). 20 output per 1M tokens; launch promo is 90% off on Upstage Console and OpenRouter through September 10, 2026 (23:59 UTC) — promo not stored in the provider price row.
Also available via SolarChat, Hermes Agent, and Upstage Studio.
Data as of 2026-08-17.
FAQ
Common questions about Solar Pro 4.
When was Solar Pro 4 released?
Solar Pro 4's default version was released on Aug 6, 2026.
How much does Solar Pro 4 cost?
Solar Pro 4's official API price is $0.30 per million input tokens and $1.2 per million output tokens via Upstage. The lowest tracked third-party offer starts at $0.03 input and $0.12 output via NanoGPT.
Who created Solar Pro 4?
Solar Pro 4 was created by Upstage.
What is the context window for Solar Pro 4?
The default version has a 524.3K token context window.
Is Solar Pro 4 open weight?
No. The default version is not marked as having publicly available weights.
How many API providers offer Solar Pro 4?
5 provider offerings are linked to the default version.
What models should I compare Solar Pro 4 with?
Nearby ranked alternatives include Muse Glimmer 30B, Grok 4.20 Beta Reasoning, DeepSeek-V3.2.