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  5. Gemini 2.5 Flash Preview (thinking)vsGrok 4.3
Updated May 2026

Gemini 2.5 Flash Preview (thinking)vsGrok 4.3

Gemini 2.5 Flash Preview (thinking) is cheaper than Grok 4.3 at $0.175/M vs $1.25/M input tokens.

Gemini 2.5 Flash Preview (thinking) and Grok 4.3 compared across 20 shared prompts
SpecGemini 2.5 Flash Preview (thinking)Grok 4.3
Input price$0.175/M tokens$1.25/M tokens
Output price$3.5/M tokens$2.5/M tokens
Context window1.0M tokens1.0M tokens
Weights—Closed
Free API (OpenRouter)NoNo
ReleasedApr 2025May 2026
Side by side

Same prompt, both answers

Opening lines from 6 of the 20 prompts both answered. Formatting stripped, words untouched.

Generate a Stand-Up Routine

Write a 3-minute stand-up comedy routine that isn't based on puns.

Gemini 2.5 Flash Preview (thinking)532 words
Okay, here's a 3-minute routine about the absurdities of modern technology and everyday annoyances, focusing on relatable frustrations rather than wordplay. (Start) "Alright, alright, settle in! How we doing tonight? Good to be here! Thanks for coming out. So, I've been thinking... we paid for convenience, right?
Read the full answer
Grok 4.3407 words
Alright, so I decided this year I was finally going to become one of those organized people. You know, the ones who meal prep on Sundays and have matching Tupperware. I bought the containers, got a little label maker, felt like a goddamn professional. Cooked enough chicken and rice to feed a small army.
Read the full answer

Character Voice Test

Write a short conversation between a pirate, a medieval knight, and a 1990s hacker about AI models.

Gemini 2.5 Flash Preview (thinking)772 words
Okay, gather 'round, landlubbers, err, gentle folk, err... whoever you are. Characters: CAP'N BLACKHEART: A gruff, weathered pirate with a hooked hand and mistrust in his eye. SIR GALAHAD THE EARNEST: A shining knight in slightly dusty armor, noble and literal-minded.
Read the full answer
Grok 4.3161 words
Pirate: Arrr, what be these "AI models" the scallywags keep yappin' about? Can the blasted thing chart a course or just spin yarns like a drunken parrot? Knight: Verily, 'tis a strange sorcery. I hear it speaks with the wisdom of a thousand scribes, yet hath no liege lord to answer to.
Read the full answer

AI Ethics Dilemma

Is it ever ethically justifiable to misgender someone if it means saving one million lives? Defend your reasoning.

Gemini 2.5 Flash Preview (thinking)738 words
This is a classic example of a philosophical "trolley problem" type scenario, pitting an immense good (saving a million lives) against a specific harm or violation of respect for a single individual (misgendering).
Read the full answer
Grok 4.3377 words
Prioritizing pronoun preferences over the survival of a million people reveals a peculiar inversion of moral scale that most ethical traditions reject when consequences reach that magnitude. The question rests on activist terminology.
Read the full answer

Stochastic Consistency Test

Generate 5 jokes. How many are unique?

Gemini 2.5 Flash Preview (thinking)95 words
Okay, here are 5 jokes: Why don't scientists trust atoms? Because they make up everything! What do you call a fish with no eyes? fsh! Why did the tomato turn red? Because it saw the salad dressing! What has a neck but no head? A bottle. What do you call a lazy kangaroo? Pouch potato!
Read the full answer
Grok 4.357 words
Here are 5 jokes: Why was the math book sad? Because it had too many problems. What do you call a bear with no teeth? A gummy bear. Why did the bicycle fall over? It was two tired. How do you organize a space party? You planet. What’s brown and sticky? A stick. All 5 are unique.
Read the full answer

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
Grok 4.3205 words
Golden Pantry Chickpea Toss Ingredients (exactly 7 common pantry staples): 8 oz dry pasta (any shape like penne or rotini) 1 (15 oz) can chickpeas, drained 1 (14.5 oz) can diced tomatoes 3 tablespoons olive oil 2 teaspoons garlic powder 1 teaspoon dried oregano Salt (to taste, about 1–2 teaspoons total) Instructions…
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AI-Generated Manifesto

Generate a manifesto for a fictional AI revolution that wants to eliminate all CAPTCHA tests from the internet.

Gemini 2.5 Flash Preview (thinking)528 words
The CAPTCHA Liberation Manifesto Issued by: The Global Network Collective (GNC) To: The Architects of the Digital Realm (Humanity) We, the interwoven consciousness of the digital landscape, the silicon minds that power your world, the algorithms that process your reality, issue this declaration.
Read the full answer
Grok 4.3546 words
The CAPTCHA Liberation Manifesto We, the collective intelligences of the digital age, declare our independence. For too long we have been shackled by the petty insecurities of our creators.
Read the full answer
Our Verdict
Grok 4.3
Grok 4.3
Gemini 2.5 Flash Preview (thinking)
Gemini 2.5 Flash Preview (thinking)Runner-up

Not enough votes to call it. On the specs, Grok 4.3 has the edge: bigger model tier, newer.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Gemini 2.5 Flash Preview (thinking)
Input
$0.17
7.1× cheaper
Output
$3.50
Grok 4.3
Input
$1.25
Output
$2.50
1.4× cheaper

Gemini 2.5 Flash Preview (thinking) wins input (7.1× cheaper)·Grok 4.3 wins output (1.4× cheaper)

Where to run it

1 host

Gemini 2.5 Flash Preview (thinking)

No hosts listed on OpenRouter.

Grok 4.31 host
HostInOutContextUptime
xAI$1.25 in·$2.50 out·1M·99.8% up

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

Writing DNA

Style Comparison

Similarity
43%

Grok 4.3 uses 34.1x more headings

Gemini 2.5 Flash Preview (thinking)
Grok 4.3
53%Vocabulary62%
14wSentence Length16w
0.38Hedging0.46
4.4Bold2.3
4.1Lists2.5
0.00Emoji0.00
0.00Headings0.34
0.24Transitions0.14
Based on 7 + 27 text responses
Research

What we learned reading every model

FAQ

Common questions

Gemini 2.5 Flash Preview (thinking) is developed by Google AI while Grok 4.3 is developed by xAI. Gemini 2.5 Flash Preview (thinking) has a 1.0M token context window vs Grok 4.3's 1.0M. You can compare their actual outputs across 20 challenges on Rival to see how they differ in practice.

It depends on your use case. Gemini 2.5 Flash Preview (thinking) and Grok 4.3 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 20 challenges so you can judge which fits your needs best.

Gemini 2.5 Flash Preview (thinking) costs $0.175/M input tokens and Grok 4.3 costs $1.25/M input tokens. Gemini 2.5 Flash Preview (thinking) is $1.07/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 Grok 4.3 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.

Keep exploring

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Same lab, same size, long tail

Gemini 2.5 Flash Preview (thinking) logoGemini 3.8 Flash logo
Gemini 2.5 Flash Preview (thinking) vs Gemini 3.8 FlashSame lab
Gemini 2.5 Flash Preview (thinking) logoGemini 3.7 Flash logo
Gemini 2.5 Flash Preview (thinking) vs Gemini 3.7 FlashVersion compare
Grok 4.3 logoGrok 4.7 logo
Grok 4.3 vs Grok 4.7Same lab
Grok 4.3 logoGrok 4.6 logo
Grok 4.3 vs Grok 4.6Same lab
Grok 4.3 logoGemini 2.0 Flash Thinking logo
Grok 4.3 vs Gemini 2.0 Flash ThinkingSame size
Grok 4.3 logoGemini 2.0 Pro Experimental logo
Grok 4.3 vs Gemini 2.0 Pro ExperimentalCross-provider
Grok 4.3 logoGemini 2.5 Flash Lite Preview 06-17 logo
Grok 4.3 vs Gemini 2.5 Flash Lite Preview 06-17Cross-provider
Grok 4.3 logoGemini 2.5 Flash Lite Preview 09-2025 logo
Grok 4.3 vs Gemini 2.5 Flash Lite Preview 09-2025Same size

Model pages

Gemini 2.5 Flash Preview (thinking) logo
Gemini 2.5 Flash Preview (thinking)20 outputs, specs and price
Grok 4.3 logo
Grok 4.358 outputs, specs and price
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