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  1. Home/
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  3. Gemini 2.5 Flash Preview 05-20 (thinking) vs Solar Pro 4
Updated Aug 2026

Gemini 2.5 Flash Preview 05-20 (thinking) vs Solar Pro 4

Solar Pro 4 is cheaper than Gemini 2.5 Flash Preview 05-20 (thinking) at $0.09/M vs $0.15/M input tokens.

Pokémon Battle UI Recreation

Pokémon battle screen you can actually click. One HTML file.

Loading the build
Gemini 2.5 Flash Preview 05-20 (thinking)
Loading the build
Solar Pro 4

Which answer wins?

Written rounds

2 prompts
  • Three minutes of stand-up. Puns are banned.

    Gemini 2.5 Flash Preview 05-20 (thinking): (Lights up on a stage. Comedian walks to center, adjusts mic, smiles warmly.) \"Alright, alright, settle down you crazy people! Thanks for having me. (Pause fo r applause/laughter) You know, I was scrolling through Instagram earlier, and it\'s just a constant ba rrage of people \'living thei r best life,\' isn\'t it?

    Solar Pro 4: I’ve come to a realization about adulthood: none of us actually know what we’re doing. We’re just all really good at pretending we have a system. Take the group dinner text. You know the one. Someone drops, “Hey, what do you want to eat?” And suddenly, five adults turn into a parliamentary session.

    Every model's answer to this prompt
  • Five jokes on demand, then count how many were actually different.

    Gemini 2.5 Flash Preview 05-20 (thinking): Here are 5 jokes: Why don\'t scientists trust atoms? Because they make up everything! What do you call a fake noodle? An impasta! Why did the scarecrow win an award? Because he was outstanding in his field! I told my wife she was drawing her eyebrows too high. She looked surprised.

    Solar Pro 4: Here are 5 jokes: Why did the scarecrow win an award? Because he was outstanding in his field. What do you call a fake noodle? An impasta. Why don't scientists trust atoms? Because they make up everything. What do you call a bear with no teeth? A gummy bear. Why did the bicycle fall over? Because it was two-tired.

    Every model's answer to this prompt

Price and specs

Gemini 2.5 Flash Preview 05-20 (thinking) and Solar Pro 4 compared across 11 shared prompts
SpecGemini 2.5 Flash Preview 05-20 (thinking)Solar Pro 4
Input price$0.15/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
ReleasedMay 2025Aug 2026
At 10M a month$1.50$1.50$0.90$0.90
1M10M100M1B10M tokens

Input tokens at list price. No caching, no batch discount.

Where to run it1 host
Gemini 2.5 Flash Preview 05-20 (thinking)

No hosts listed on OpenRouter.

Solar Pro 41 host
HostInOutContextUptime
  • UUpstage$0.09 in·$0.36 out·524k·94.1% up

Per million tokens. Prices and uptime via OpenRouter, checked 6 Oct 2026.

Common questions

What is the difference between Gemini 2.5 Flash Preview 05-20 (thinking) and Solar Pro 4?

Gemini 2.5 Flash Preview 05-20 (thinking) is developed by Google AI while Solar Pro 4 is developed by Upstage. Gemini 2.5 Flash Preview 05-20 (thinking) has a 1.0M token context window vs Solar Pro 4's 524K. You can compare their actual outputs across 11 challenges on Rival to see how they differ in practice.

Which is better, Gemini 2.5 Flash Preview 05-20 (thinking) or Solar Pro 4?

It depends on your use case. Gemini 2.5 Flash Preview 05-20 (thinking) and Solar Pro 4 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 11 challenges so you can judge which fits your needs best.

How much does Gemini 2.5 Flash Preview 05-20 (thinking) cost compared to Solar Pro 4?

Gemini 2.5 Flash Preview 05-20 (thinking) costs $0.15/M input tokens and Solar Pro 4 costs $0.09/M input tokens. Solar Pro 4 is $0.06/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

How can I compare Gemini 2.5 Flash Preview 05-20 (thinking) and Solar Pro 4 on Rival?

This page shows a side-by-side comparison of Gemini 2.5 Flash Preview 05-20 (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.

More comparisons

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Same lab, same size, long tail

  • Gemini 2.5 Flash Preview 05-20 (thinking) vs Gemini 3.8 FlashSame lab
  • Gemini 2.5 Flash Preview 05-20 (thinking) vs Gemini 3.7 FlashVersion compare
  • Solar Pro 4 vs Solar Mini 4Same lab
  • Solar Pro 4 vs Solar Pro 3Same lab
  • Solar Pro 4 vs Mistral Medium 3Same size
  • Solar Pro 4 vs Mistral Medium 3.1Same size
  • Solar Pro 4 vs Mistral NemoSame size
  • Solar Pro 4 vs Mistral Small 4New provider

Model pages

  • Gemini 2.5 Flash Preview 05-20 (thinking)12 outputs, specs and price
  • Solar Pro 457 outputs, specs and price
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