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UpstageSolar Pro 4

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Solar Pro 4 is Upstage's commercial flagship language model for agentic work, tool use, long-document reasoning, and multilingual English, Korean, and Japanese workloads.

Token context
524K tokens
Inputs
Text
Outputs
Text
Released
Aug 14, 2026

Providers & Pricing

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ProviderInput / 1MOutput / 1MCache read / 1MCache write / 1MObservedEvidence
$0.090$0.36$0.018—Sep 18, 2026Provider-reported

At a Glance

Model Facts

Identity

Status
active
Developer ID
solar-pro4
Released
Aug 14, 2026
Version
Solar Pro 4
License
Unknown

Capacity

Token context
524K tokens
Maximum output
131K tokens
Total parameters
Unknown
Active parameters
Unknown
Knowledge cutoff
Not reported

Interface and Access

Inputs
Text
Outputs
Text
API available
Yes
Open weights
No
Self-hostable
Yes
Reasoning
Yes
Vision
No
Tool calling
Yes
Capabilities
agents, chat, generation, reasoning, structured outputs, tools

Technical Specifications

Supported languages
English, Korean, Japanese
Training data cutoff
February 2026

This page represents one developer model product. Dated API snapshots, serving endpoints, pricing, regions, quantizations, and service tiers attach as versioned aliases or provider details and never create duplicate public model records.

Version Lineage

PredecessorUnknown
SuccessorsUnknown
Aliasessolar-pro4, Solar Pro 4

Explicit Unknowns

  • Architecture
  • Tokenizer
  • Knowledge cutoff

Primary Evidence

Sources and Observation Date

Compare generative intelligence models | Upstage ConsoleUpstage · observed Sep 18, 2026API pricing | UpstageUpstage · observed Sep 18, 2026Solar Pro 4: The Agentic Model That Finishes the JobUpstage · observed Sep 18, 2026Upstage releases Solar Pro 4Upstage · observed Sep 18, 2026

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Questions

Solar Pro 4 FAQs

What is Solar Pro 4?+

Solar Pro 4 is Upstage's commercial flagship language model for agentic work, tool use, long-document reasoning, and multilingual English, Korean, and Japanese workloads. It is developed by Upstage and its current sourced lifecycle status is active.

What inputs and outputs does Solar Pro 4 support?+

Solar Pro 4's current record lists Text as input and Text as output.

How much context does Solar Pro 4 support?+

The current record lists a 524K-token context window and a maximum output of 131K tokens.

What technical specifications are published for Solar Pro 4?+

Solar Pro 4's developer-published specifications include supported languages: English, Korean, Japanese; training data cutoff: February 2026.

Is Solar Pro 4 available through an API?+

Solar Pro 4 is marked as API-available. The directly sourced provider records currently include Upstage.

What capabilities and tasks does Solar Pro 4 support?+

Solar Pro 4's recorded capabilities are agents, chat, generation, reasoning, structured outputs, and tools. Its supported tasks are agents, reasoning, and text.

How much does Solar Pro 4 cost through an API?+

The lowest directly sourced prices currently attached to Solar Pro 4 are $0.090 per million input tokens through Upstage and $0.36 per million output tokens through Upstage. Prices are provider-specific and should be checked against each cited observation date.

Can Solar Pro 4 be self-hosted?+

Solar Pro 4 is not marked as an open-weight model. Self-hosting is supported, with no license recorded.

Does Solar Pro 4 have related versions or aliases?+

No predecessor is recorded. No successor is recorded. Recorded aliases are solar-pro4 and Solar Pro 4.

Which models can Solar Pro 4 be compared with?+

The current compatible peer set includes GPT-6 Astra, Claude Fable 5.1, Gemini 3.1 Pro, DeepSeek V4.1 Flash, and Grok 4.6. Compatibility requires shared sourced modalities and tasks; it does not imply that one model is better. Browse model comparisons →

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