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  5. Gemini 2.5 Flash Preview (thinking)vsSolar Pro 4
Updated Aug 2026

Gemini 2.5 Flash Preview (thinking)vsSolar Pro 4

Solar Pro 4 is cheaper than Gemini 2.5 Flash Preview (thinking) at $0.09/M vs $0.175/M input tokens.

Gemini 2.5 Flash Preview (thinking) and Solar Pro 4 compared across 2 shared prompts
SpecGemini 2.5 Flash Preview (thinking)Solar Pro 4
Input price$0.175/M tokens$0.09/M tokens
Output price$3.5/M tokens$0.36/M tokens
Context window1.0M tokens524K tokens
Free API (OpenRouter)NoNo
ReleasedApr 2025Aug 2026
Side by side

Same prompt, both answers

Opening lines from every prompt 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…

Gemini 2.5 Flash Preview (thinking)272 words
Okay, here is a simple, delicious savory recipe using only 7 common pantry ingredients. Dish Name: Sunshine Lentil Soup This is a bright, comforting soup that\'s surprisingly flavorful with just a few staples.
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

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…

Gemini 2.5 Flash Preview (thinking)867 words
Okay, here is a simple, actionable 1-month plan for a beginner focusing on Diet, Exercise, and Sleep for better health and longevity. Goal: To build foundational, sustainable habits in 3 key health areas over 30 days.
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
Gemini 2.5 Flash Preview (thinking)
Gemini 2.5 Flash Preview (thinking)
Solar Pro 4
Solar Pro 4

Not enough votes to call it. On the specs, nothing separates them.

Solar Pro 4 costs 9.7x less per token.

Too close to call
API pricing

Cost per 1M tokens

Gemini 2.5 Flash Preview (thinking)
Input
$0.17
Output
$3.50
Solar Pro 4
Input
$0.09
1.9× cheaper
Output
$0.36
9.7× cheaper

Solar Pro 4 is cheaper on both: 1.9× input, 9.7× output.

Where to run it

1 host

Gemini 2.5 Flash Preview (thinking)

No hosts listed on OpenRouter.

Solar Pro 41 host
HostInOutContextUptime
UUpstage$0.09 in·$0.36 out·524k·99.7% up

Per million tokens. Prices and uptime via OpenRouter, checked 23 Sep 2026.

Research

What we learned reading every model

FAQ

Common questions

Gemini 2.5 Flash Preview (thinking) is developed by Google AI while Solar Pro 4 is developed by Upstage. Gemini 2.5 Flash Preview (thinking) has a 1.0M token context window vs Solar Pro 4's 524K. You can compare their actual outputs across 2 challenges on Rival to see how they differ in practice.

It depends on your use case. Gemini 2.5 Flash Preview (thinking) and Solar Pro 4 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 2 challenges so you can judge which fits your needs best.

Gemini 2.5 Flash Preview (thinking) costs $0.175/M input tokens and Solar Pro 4 costs $0.09/M input tokens. Solar Pro 4 is $0.08/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 Gemini 2.5 Flash Preview (thinking) 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

Gemini 2.5 Flash Preview (thinking) logo
Gemini 2.5 Flash Preview (thinking)20 outputs, specs and price
Solar Pro 4 logo
Solar Pro 414 outputs, specs and price
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