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  5. GPT-5.2 ProvsSolar Mini 4
Updated Sep 2026

GPT-5.2 ProvsSolar Mini 4

Solar Mini 4 is cheaper than GPT-5.2 Pro at $0.05/M vs $21/M input tokens.

GPT-5.2 Pro and Solar Mini 4 compared across 16 shared prompts
SpecGPT-5.2 ProSolar Mini 4
Input price$21/M tokens$0.05/M tokens
Output price$168/M tokens$0.2/M tokens
Context window400K tokens524K tokens
WeightsClosed—
Free API (OpenRouter)NoNo
ReleasedDec 2025Sep 2026
Side by side

Same prompt, both answers

Opening lines from 3 of the 16 prompts both answered. Formatting stripped, words untouched.

Mini LBO Underwrite

You are underwriting a 5-year LBO for a private equity investment committee. Company (fictional): HarborTech Services (HTS) –…

GPT-5.2 Pro161 words
Entry (close end of FY2025) FY2025 EBITDA = $120.0m Entry EV = 12.0x = 12.0 × 120.0 = $1,440.0m Transaction fees = 2.0% EV = 0.02 × 1,440.0 = $28.8m (equity-funded) Debt at close (5.5x EBITDA = 5.5 × 120 = $660m): Term Loan = 4.0x = $480.0m Mezzanine = 1.5x = $180.0m Equity check Uses = 1,440.0 + 28.8 = $1,468.8m…
Read the full answer
Solar Mini 41,718 words
518.51935 New TL: 276.34682 - 86.82747 = 189.51935 Mezz: PIK 194.8377888 * 0.02 = 3.896755776 New Mezz: 194.8377888 + 3.896755776 = 198.734544576 Ending Balances: TL: 189.52 Mezz: 198.73 Total Debt: 388.25 Exit (End of FY2030): Exit EBITDA: 206.6252668 Exit Multiple: 10.5x Exit EV: 206.6252668 * 10.5 = 2,169.5653014…
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-5.2 Pro837 words
A simple, actionable 1‑month plan (3 pillars: Nutrition, Movement, Sleep/Recovery) Goal for the month: build repeatable “default” habits (not perfection). Time required: ~45–75 min/day total (mostly walking + sleep routine).
Read the full answer
Solar Mini 4669 words
Here is a simple, actionable 1-month plan designed for beginners. The focus is on consistency over intensity, meaning small, sustainable changes are better than drastic overhauls that are hard to maintain. The 3 Key Pillars Nutrition: Focus on adding good things rather than strictly restricting.
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-5.2 Pro484 words
LedgerLift (LLLT) — Internal IC Memo (Long/Short Equity) Recommendation, PT, thesis Recommendation: SHORT 12-month PT range: $28–$40 (midpoint $34) Thesis (2 sentences): LLLT is a high-quality B2B spend/AP automation SaaS business (92% subscription, 123% NRR, 78% FY25 GM) but the stock prices in a longer runway of…
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Solar Mini 4347 words
Investment Committee Memo: LedgerLift (LLLT) To: Investment Committee From: Research Date: October 26, 2023 Subject: Long/Short Recommendation: LedgerLift (LLLT) Recommendation Action: Long 12-Month PT Range: $55 – $65 Thesis: LedgerLift demonstrates best-in-class SaaS metrics (123% NRR, 94% gross retention) within a…
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Our Verdict
GPT-5.2 Pro
GPT-5.2 Pro
Solar Mini 4
Solar Mini 4Runner-up

Not enough votes to call it. On the specs, GPT-5.2 Pro has the edge: bigger model tier, major provider backing.

Solar Mini 4 costs 840x less per token.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

GPT-5.2 Pro
Input
$21.00
Output
$168.00
Solar Mini 4
Input
$0.05
420× cheaper
Output
$0.20
840× cheaper

Solar Mini 4 is cheaper on both: 420× input, 840× output.

Where to run it

2 hosts

GPT-5.2 Pro1 host
HostInOutContextUptime
OpenAI$21.00 in·$168.00 out·400k·100% up
Solar Mini 41 host
HostInOutContextUptime
UUpstage$0.05 in·$0.20 out·524k·100% up

Per million tokens. Prices and uptime via OpenRouter, checked 25 Sep 2026.

Research

What we learned reading every model

FAQ

Common questions

GPT-5.2 Pro is developed by OpenAI while Solar Mini 4 is developed by Upstage. GPT-5.2 Pro has a 400K token context window vs Solar Mini 4's 524K. You can compare their actual outputs across 16 challenges on Rival to see how they differ in practice.

It depends on your use case. GPT-5.2 Pro and Solar Mini 4 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 16 challenges so you can judge which fits your needs best.

GPT-5.2 Pro costs $21/M input tokens and Solar Mini 4 costs $0.05/M input tokens. Solar Mini 4 is $20.95/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-5.2 Pro and Solar Mini 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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