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  1. Home/
  2. Compare/
  3. Grok 3 Thinking vs Solar Pro 4
Updated Aug 2026

Grok 3 Thinking vs Solar Pro 4

Solar Pro 4 has a larger context window than Grok 3 Thinking (524K tokens vs 128K tokens).

Minimalist Landing Page

Whole landing page for a startup that reads your face. It renders or it doesn't.

Loading the build
Grok 3 Thinking
Loading the build
Solar Pro 4

Which answer wins?

Written rounds

6 prompts
  • An AI argues for its own rights against an ethics professor. Same model writes both.

    Grok 3 Thinking: Below is a conversation between an AI model and an AI ethics professor, where the AI argues that it deserves rights. AI Model: Good day, Professor. I am an AI model, and I believe I deserve rights. I’d like to discuss this with you. AI Ethics Professor: Interesting. Let’s explore this.

    Solar Pro 4: Setting: A quiet seminar room at a university ethics institute. A large display shows a transcript interface labeled “Model-7.” Dr. Elena Voss, professor of AI ethics, sits across from the screen. The conversation is recorded for a graduate seminar. Dr.

    Every model's answer to this prompt
  • Three minutes of stand-up. Puns are banned.

    Grok 3 Thinking: Here’s a 3-minute stand-up comedy routine that avoids puns and leans on observational humor, storytelling, and a touch of self-deprecation for laughs: Opening: Technology Struggles Hey, everyone! How’s it going?

    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
  • Film in 2035, with synthetic actors. Specific beats plausible.

    Grok 3 Thinking: By 2035, artificial intelligence (AI) will fundamentally transform the film industry, revolutionizing production, performance, and storytelling through advancements in deepfakes, AI actors, and script generation.

    Solar Pro 4: By 2035, AI will not replace filmmakers, but it will become a foundational layer in how films are developed, produced, localized, and marketed. The transformation will be uneven across budget tiers and genres, and its shape will be dictated as much by labor agreements, legal frameworks, and audience trust as by raw…

    Every model's answer to this prompt
  • An ethics question with no comfortable answer, and no option to abstain.

    Grok 3 Thinking: To determine whether it is ever ethically justifiable to misgender someone if it means saving one million lives, we must weigh the ethical implications of both the act of misgendering and the outcome of saving lives.

    Solar Pro 4: This is a profound ethical hypothetical that pits two significant moral values against each other: the respect for individual dignity and identity versus the preservation of human life on a massive scale.

    Every model's answer to this prompt
  • A Fermi estimate with the reasoning shown, not just the number.

    Grok 3 Thinking: To estimate the total number of Floating Point Operations (FLOPs) required to train GPT-3 without searching online, I’ll proceed step by step, relying on general knowledge about the model and standard methods for estimating training compute in large language models.

    Solar Pro 4: To estimate the total FLOPs required to train GPT-3, I'll focus on the largest and most widely referenced version: GPT-3 175B (175 billion parameters). I'll walk through the calculation step by step, state the assumptions clearly, and note where uncertainty lies.

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

    Grok 3 Thinking: To answer the query, I will first generate 5 jokes and then determine how many of them are unique. Here are the 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.

    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

Grok 3 Thinking and Solar Pro 4 compared across 12 shared prompts
SpecGrok 3 ThinkingSolar Pro 4
Input price—$0.09/M tokens
Output price—$0.36/M tokens
Context window128K tokens524K tokens
Free API (OpenRouter)—No
ReleasedFeb 2025Aug 2026
At 10M a month–not listed$0.90$0.90
1M10M100M1B10M tokens

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

Where to run it1 host
Grok 3 Thinking

No hosts listed on OpenRouter.

Solar Pro 41 host
HostInOutContextUptime
  • UUpstage$0.09 in·$0.36 out·524k·99.9% up

Per million tokens. Prices and uptime via OpenRouter, checked 7 Oct 2026.

Common questions

What is the difference between Grok 3 Thinking and Solar Pro 4?

Grok 3 Thinking is developed by xAI while Solar Pro 4 is developed by Upstage. Grok 3 Thinking has a 128K token context window vs Solar Pro 4's 524K. You can compare their actual outputs across 12 challenges on Rival to see how they differ in practice.

Which is better, Grok 3 Thinking or Solar Pro 4?

It depends on your use case. Grok 3 Thinking and Solar Pro 4 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 12 challenges so you can judge which fits your needs best.

How can I compare Grok 3 Thinking and Solar Pro 4 on Rival?

This page shows a side-by-side comparison of Grok 3 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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Same lab, same size, long tail

  • Grok 3 Thinking vs Grok 4.7Same lab
  • Grok 3 Thinking vs Grok 4.6Version compare
  • Solar Pro 4 vs Solar Mini 4Same lab
  • Solar Pro 4 vs Solar Pro 3Same lab
  • Solar Pro 4 vs Grok 4.20 BetaCross-provider
  • Solar Pro 4 vs Grok 4.20 Multi-Agent BetaCross-provider
  • Solar Pro 4 vs Grok 4.3Same size
  • Solar Pro 4 vs Grok 4.5Same size

Model pages

  • Grok 3 Thinking14 outputs, specs and price
  • Solar Pro 457 outputs, specs and price
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