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KAT-Coder-Pro V2 vs Solar Pro 4

KAT-Coder-Pro V2 (Kuaishou) and Solar Pro 4 (Upstage) compared on the ModelCap Index, API price, context window, provider availability, weight access and every public benchmark board they share. Figures are the same ones shown on the live rankings; nothing here is a hidden score.

Snapshot as of 3 September 2026

As of 3 September 2026, KAT-Coder-Pro V2 holds the stronger ModelCap Index position (#57 vs #58); Solar Pro 4 is 10× cheaper per output token ($0.12/1M vs $1.20/1M); and Solar Pro 4 offers the longer context window (524K vs 262K tokens).

Which should you choose?

Choose KAT-Coder-Pro V2 if…

  • you want the stronger overall ModelCap Index position — #57 against #58 (46.3 vs 45.9 points).
  • AA Terminal-Bench 2.1 is your yardstick — 70.0% against 57.3%.

Choose Solar Pro 4 if…

  • API cost matters — $0.12/1M output tokens against $1.20/1M, about 10× cheaper.
  • your workload is prompt-heavy — input tokens cost $0.03/1M against $0.30/1M.
  • you need the longer context window — 524K tokens against 262K.
  • AA Intelligence Index is your yardstick — 41.6 against 33.7.
  • AA Humanity's Last Exam is your yardstick — 29.2% against 16.1%.
  • you want the more recently listed model — Solar Pro 4 was listed 10 August 2026, KAT-Coder-Pro V2 27 March 2026.

KAT-Coder-Pro V2 vs Solar Pro 4: specs, pricing and context

Specification comparison of KAT-Coder-Pro V2 and Solar Pro 4
FieldKAT-Coder-Pro V2KuaishouSolar Pro 4Upstage
ModelCap Index position#57#58
Index score46.345.9
EvidenceMeasuredMeasured
Input price / 1M tokens$0.30$0.03
Output price / 1M tokens$1.20$0.12
Context window262K tokens524K tokens
Max output tokens144K131K
API providers listed11
Weight accessAPI onlyAPI only
Input modalitiesTextText
First listed27 March 202610 August 2026
PublisherKuaishouUpstage

Evidence: 1 public benchmark observation across 1 board · 4 public benchmark observations across 4 boards. Prices are the lowest listed API offer per million tokens observed on the OpenRouter catalogue.

Benchmark scores: KAT-Coder-Pro V2 vs Solar Pro 4

Public benchmark boards where KAT-Coder-Pro V2 or Solar Pro 4 has a published result
BoardKAT-Coder-Pro V2Solar Pro 4Leads
Arena codingArena (LMArena)—14461424–1469Only one result
LMArena AgentLMArena—-9.2%-12.5%–-5.9%Only one result
AA Intelligence IndexArtificial Analysis33.7intelligence-index41.6intelligence-indexSolar Pro 4
AA Terminal-Bench 2.1Artificial Analysis70.0%terminal-bench-2.157.3%terminal-bench-2.1KAT-Coder-Pro V2
AA τ²-Bench TelecomArtificial Analysis89.5%tau2-bench-telecom—Only one result
AA Humanity's Last ExamArtificial Analysis16.1%humanitys-last-exam29.2%humanitys-last-examSolar Pro 4

Scores are the sources' own published figures for each model's best evaluated configuration; ModelCap never re-runs a benchmark.

Want a different pairing? Open the interactive comparison tool to swap either model for any current ranked language model.

KAT-Coder-Pro V2 vs Solar Pro 4: common questions

Is KAT-Coder-Pro V2 better than Solar Pro 4?

KAT-Coder-Pro V2 ranks higher on the ModelCap Index as of 3 September 2026: #57 against #58. That is a capability ranking built from public benchmark evidence with published uncertainty; whether it is "better" for you also depends on price, context and where you can run it.

Is KAT-Coder-Pro V2 cheaper than Solar Pro 4?

Solar Pro 4 is cheaper on output tokens: $0.12/1M against $1.20/1M. Input tokens are $0.30/1M for KAT-Coder-Pro V2 and $0.03/1M for Solar Pro 4. Prices are the lowest listed API offer ModelCap observed, in USD per million tokens.

Which has the bigger context window, KAT-Coder-Pro V2 or Solar Pro 4?

Solar Pro 4 has the larger context window: 524K tokens against 262K.

Which is better for coding, KAT-Coder-Pro V2 or Solar Pro 4?

AA Terminal-Bench 2.1: KAT-Coder-Pro V2 70.0%, Solar Pro 4 57.3% — KAT-Coder-Pro V2 leads.

Are KAT-Coder-Pro V2 and Solar Pro 4 open-weight models?

KAT-Coder-Pro V2: API only. Solar Pro 4: API only. Open weights mean the checkpoint can be downloaded and self-hosted under its licence; API-only models are available solely through hosted endpoints.

Where can I run KAT-Coder-Pro V2 and Solar Pro 4?

ModelCap currently lists 1 API provider for KAT-Coder-Pro V2 and 1 for Solar Pro 4, from the OpenRouter catalogue snapshot the site serves; each model page lists the providers and their prices.

How current is this KAT-Coder-Pro V2 vs Solar Pro 4 comparison?

Every figure comes from the sealed ModelCap dataset published 3 September 2026; the page re-renders within a minute of each data refresh, and the ModelCap Index positions are the same ones shown on the live rankings.

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