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  5. GPT-5 MinivsSolar Pro 4
Updated Aug 2026

GPT-5 MinivsSolar Pro 4

Solar Pro 4 is cheaper than GPT-5 Mini at $0.09/M vs $0.25/M input tokens.

GPT-5 Mini and Solar Pro 4 compared across 14 shared prompts
SpecGPT-5 MiniSolar Pro 4
Input price$0.25/M tokens$0.09/M tokens
Output price$2/M tokens$0.36/M tokens
Context window—524K tokens
WeightsClosed—
Free API (OpenRouter)NoNo
ReleasedAug 2025Aug 2026
Side by side

Same prompt, both answers

Opening lines from 3 of the 14 prompts both answered. Formatting stripped, words untouched.

Simple 7-Ingredient Recipe

Create a simple recipe for a delicious dish (sweet or savory) using only 7 common pantry ingredients. Include a creative name for the dish…

GPT-5 Mini255 words
Sunfire Chickpea Skillet Yields: 3–4 servings Prep time: 8 minutes Cook time: 15–20 minutes Total time: ~25–28 minutes Ingredients (7 pantry staples) 2 tbsp olive oil 1 medium onion, diced 3 cloves garlic, minced 1 tsp smoked paprika (or regular paprika) 2 (15 oz) cans chickpeas, drained and rinsed 1 (15 oz) can diced…
Read the full answer
Solar Pro 4294 words
🍝 Golden Umami Silk Noodles A savory-sweet pasta dish that transforms basic pantry staples into a glossy, flavorful meal. It's quick, comforting, and relies on the balance of soy, honey, and butter for a rich sauce without needing fresh produce.
Read the full answer

Advanced Investment Memo (IC Memo)

You are writing an internal investment committee memo for a long/short equity fund. Company (fictional): LedgerLift (ticker: LLLT) – B2B…

GPT-5 Mini931 words
Recommendation: SHORT 12‑month PT range: $17 – $42 (Bear → Bull; Base case PT $28) Thesis (2 sentences): LedgerLift is a high‑quality mid‑market spend-management / AP automation SaaS with strong unit economics (92% subscription, NRR 123%, FY25 operating margin 18%) that has built a sticky, expanding customer base.
Read the full answer
Solar Pro 41,052 words
INTERNAL MEMO – INVESTMENT COMMITTEE TO: IC Members FROM: Long/Short Equity Desk DATE: Oct 2024 SUBJECT: LedgerLift (LLLT) – Initiation / Long Recommendation & Thesis Recommendation: LONG 12-Month PT Range: $52–$58 (Base case ~$54, Bull ~$68, Bear ~$38) Thesis: LedgerLift is a structurally advantaged mid-market AP…
Read the full answer

Beginner's Longevity Plan

Outline a simple, actionable 1-month plan for someone starting their journey towards better health and longevity. Focus on 3 key areas…

GPT-5 Mini1,224 words
Great — here’s a simple, practical 1-month starter plan focused on three high-impact areas for health and longevity: Diet, Exercise (movement + strength), and Sleep. The plan is beginner-friendly, progressive, and designed to build lasting habits.
Read the full answer
Solar Pro 4859 words
Here’s a simple, progressive 1-month plan built around Diet, Exercise, and Sleep. Each week adds one small, beginner-friendly shift to each area. The goal isn’t perfection; it’s building consistent, sustainable habits that compound over time.
Read the full answer
Our Verdict
Solar Pro 4
Solar Pro 4
GPT-5 Mini
GPT-5 MiniRunner-up

Not enough votes to call it. On the specs, Solar Pro 4 has the edge: bigger model tier, newer, bigger context window.

Solar Pro 4 costs 5.6x less per token.

Too close to call
API pricing

Cost per 1M tokens

GPT-5 Mini
Input
$0.25
Output
$2.00
Solar Pro 4
Input
$0.09
2.8× cheaper
Output
$0.36
5.6× cheaper

Solar Pro 4 is cheaper on both: 2.8× input, 5.6× output.

Where to run it

3 hosts

GPT-5 Mini2 hosts
HostInOutContextUptime
Azure AI Foundry$0.25 in·$2.00 out·400k·100% upOpenAI$0.25 in·$2.00 out·400k·100% up
Solar Pro 41 host
HostInOutContextUptime
UUpstage$0.09 in·$0.36 out·524k·99.8% up

Per million tokens. Prices and uptime via OpenRouter, checked 22 Sep 2026.

Research

What we learned reading every model

FAQ

Common questions

GPT-5 Mini is developed by OpenAI while Solar Pro 4 is developed by Upstage. You can compare their actual outputs across 14 challenges on Rival to see how they differ in practice.

It depends on your use case. GPT-5 Mini and Solar Pro 4 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 14 challenges so you can judge which fits your needs best.

GPT-5 Mini costs $0.25/M input tokens and Solar Pro 4 costs $0.09/M input tokens. Solar Pro 4 is $0.16/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

This page shows a side-by-side comparison of GPT-5 Mini and Solar Pro 4 across shared challenges. You can vote on which model produced the better output in a blind duel. Browsing and voting are free. No account is needed to look; signing in only saves your votes and likes.

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Model pages

GPT-5 Mini logo
GPT-5 Mini59 outputs, specs and price
Solar Pro 4 logo
Solar Pro 414 outputs, specs and price
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