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Head-to-head comparison

Mistral Small 4 vs Solar Pro 4

Mistral Small 4 (Mistral AI) 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 9 September 2026

As of 9 September 2026, Solar Pro 4 holds the stronger ModelCap Index position (#93 vs #96); Solar Pro 4 is 5× cheaper per output token ($0.12/1M vs $0.60/1M); Solar Pro 4 offers the longer context window (524K vs 262K tokens); and Mistral Small 4 ships open weights.

Which should you choose?

Choose Mistral Small 4 if…

  • you want to self-host: Mistral Small 4 ships open weights while Solar Pro 4 is api only.
  • you want provider choice — 2 listed API providers against 1.

Choose Solar Pro 4 if…

  • you want the stronger overall ModelCap Index position — #93 against #96 (42.3 vs 41.1 points).
  • API cost matters — $0.12/1M output tokens against $0.60/1M, about 5× cheaper.
  • your workload is prompt-heavy — input tokens cost $0.03/1M against $0.15/1M.
  • you need the longer context window — 524K tokens against 262K.
  • AA Terminal-Bench 2.1 is your yardstick — 57.3% against 21.0%.
  • you want the more recently listed model — Solar Pro 4 was listed 10 August 2026, Mistral Small 4 16 March 2026.

Mistral Small 4 vs Solar Pro 4: specs, pricing and context

Specification comparison of Mistral Small 4 and Solar Pro 4
FieldMistral Small 4Mistral AISolar Pro 4Upstage
ModelCap Index position#96#93
Index score41.142.3
EvidenceMeasuredMeasured
Input price / 1M tokens$0.15$0.03
Output price / 1M tokens$0.60$0.12
Context window262K tokens524K tokens
Max output tokens210K131K
API providers listed21
Weight accessOpen weightsAPI only
Input modalitiesText, ImageText
First listed16 March 202610 August 2026
PublisherMistral AIUpstage

Evidence: 1 public benchmark observation across 1 board · 3 public benchmark observations across 3 boards. Prices are the lowest listed API offer per million tokens observed on the OpenRouter catalogue.

Benchmark scores: Mistral Small 4 vs Solar Pro 4

Public benchmark boards where Mistral Small 4 or Solar Pro 4 has a published result
BoardMistral Small 4Solar Pro 4Leads
Arena codingArena (LMArena)—14471425–1470Only one result
LMArena AgentLMArena—-11.3%-15.0%–-7.5%Only one result
AA Intelligence IndexArtificial Analysis11.5intelligence-index:v4.3:reasoning-unspecified—Only one result
AA Terminal-Bench 2.1Artificial Analysis21.0%terminal-bench:2.1:terminus-2:e2b:pass-at-1:3-repeats:source-model="Mistral Small 4":reasoning=true57.3%terminal-bench:2.1:terminus-2:e2b:pass-at-1:3-repeats:source-model="Solar Pro 4":reasoning=trueSolar Pro 4
AA Humanity's Last ExamArtificial Analysis—29.2%hle:may-2025:text-only-2158:no-tools:pass-at-1:source-model="Solar Pro 4":reasoning=trueOnly one result

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.

Mistral Small 4 vs Solar Pro 4: common questions

Is Mistral Small 4 better than Solar Pro 4?

Solar Pro 4 ranks higher on the ModelCap Index as of 9 September 2026: #93 against #96. 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. Their published uncertainty intervals overlap, so the rank difference alone does not establish a reliable capability advantage for your workload.

Is Mistral Small 4 cheaper than Solar Pro 4?

Solar Pro 4 is cheaper on output tokens: $0.12/1M against $0.60/1M. Input tokens are $0.15/1M for Mistral Small 4 and $0.03/1M for Solar Pro 4. Prices are the lowest listed API offer ModelCap observed, in USD per million tokens. For 1,000 requests with 2,000 input and 500 output tokens each (2M input + 0.5M output), the listed-rate estimate is $0.60 for Mistral Small 4 versus $0.12 for Solar Pro 4. Solar Pro 4 costs 80.0% less in this scenario. This excludes caching, batch discounts, prompt-length tiers, tool charges and retries; verify the selected endpoint before budgeting.

Which has the bigger context window, Mistral Small 4 or Solar Pro 4?

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

Which is better for coding, Mistral Small 4 or Solar Pro 4?

AA Terminal-Bench 2.1: Mistral Small 4 21.0%, Solar Pro 4 57.3% — Solar Pro 4 leads.

Are Mistral Small 4 and Solar Pro 4 open-weight models?

Mistral Small 4: Open weights. 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 Mistral Small 4 and Solar Pro 4?

ModelCap currently lists 2 API providers for Mistral Small 4 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 Mistral Small 4 vs Solar Pro 4 comparison?

Every figure comes from the sealed ModelCap dataset published 9 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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