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  5. GPT-5.2 ProvsSolar Pro 4
Updated Aug 2026

GPT-5.2 ProvsSolar Pro 4

Solar Pro 4 is cheaper than GPT-5.2 Pro at $0.09/M vs $21/M input tokens.

GPT-5.2 Pro and Solar Pro 4 compared across 13 shared prompts
SpecGPT-5.2 ProSolar Pro 4
Input price$21/M tokens$0.09/M tokens
Output price$168/M tokens$0.36/M tokens
Context window400K tokens524K tokens
WeightsClosed—
Free API (OpenRouter)NoNo
ReleasedDec 2025Aug 2026
Side by side

Same prompt, both answers

Opening lines from 2 of the 13 prompts both answered. Formatting stripped, words untouched.

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…
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-5.2 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 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
GPT-5.2 Pro
GPT-5.2 Pro
Solar Pro 4
Solar Pro 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 Pro 4 costs 467x less per token.

Too close to call
API pricing

Cost per 1M tokens

GPT-5.2 Pro
Input
$21.00
Output
$168.00
Solar Pro 4
Input
$0.09
233× cheaper
Output
$0.36
467× cheaper

Solar Pro 4 is cheaper on both: 233× input, 467× output.

Where to run it

2 hosts

GPT-5.2 Pro1 host
HostInOutContextUptime
OpenAI$21.00 in·$168.00 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-5.2 Pro is developed by OpenAI while Solar Pro 4 is developed by Upstage. GPT-5.2 Pro has a 400K token context window vs Solar Pro 4's 524K. You can compare their actual outputs across 13 challenges on Rival to see how they differ in practice.

It depends on your use case. GPT-5.2 Pro and Solar Pro 4 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 13 challenges so you can judge which fits your needs best.

GPT-5.2 Pro costs $21/M input tokens and Solar Pro 4 costs $0.09/M input tokens. Solar Pro 4 is $20.91/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 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-5.2 Pro logo
GPT-5.2 Pro31 outputs, specs and price
Solar Pro 4 logo
Solar Pro 414 outputs, specs and price
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