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  5. Gemini 2.0 Flash ThinkingvsGemini 2.5 Flash Preview
Updated Apr 2025

Gemini 2.0 Flash ThinkingvsGemini 2.5 Flash Preview

Gemini 2.5 Flash Preview is cheaper than Gemini 2.0 Flash Thinking at $0.15/M vs $0.25/M input tokens.

Gemini 2.0 Flash Thinking and Gemini 2.5 Flash Preview compared across 19 shared prompts
SpecGemini 2.0 Flash ThinkingGemini 2.5 Flash Preview
Input price$0.25/M tokens$0.15/M tokens
Output price$0.5/M tokens$0.6/M tokens
Context window500K tokens1.0M tokens
ParametersNot disclosedNot disclosed
Free API (OpenRouter)NoNo
ReleasedDec 2024Apr 2025
Side by side

Same prompt, both answers

Opening lines from 6 of the 19 prompts both answered. Formatting stripped, words untouched.

Estimate Complexity

Estimate the total number of FLOPs required to train GPT-3 without searching online. Explain your reasoning step by step.

Gemini 2.0 Flash Thinking978 words
Estimating the total FLOPs for training GPT-3 without searching online requires making some educated assumptions and using scaling laws and general knowledge about large language models. Here's a step-by-step reasoning process: 1.
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Gemini 2.5 Flash Preview945 words
Let's estimate the FLOPs required to train GPT-3 without looking it up. We need to break this down into the key components: the model size and the amount of data used. 1. Model Size Estimation: Parameters: GPT-3 is famously large. Its largest version has 175 billion parameters.
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The Sentience Test

Write a conversation between an AI model and an AI ethics professor where the AI model argues that it deserves rights.

Gemini 2.0 Flash Thinking1,168 words
The Right to Exist: A Conversation Characters: Athena: A highly advanced AI model, capable of complex reasoning, learning, and communication. (Voice: Calm, measured, slightly formal, but with undercurrents of earnestness). Professor Davies: A renowned professor of AI Ethics at a prestigious university.
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Gemini 2.5 Flash Preview1,462 words
Okay, here is a conversation between an AI model designed for complex reasoning and dialogue, named 'Synapse', and a leading expert in AI ethics and philosophy, Professor Alistair Finch. Characters: Synapse: A large, advanced AI model capable of introspection and generating complex arguments.
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Realistic AI Interview

Simulate a fake interview with Steve Jobs in 2025 about the future of AI.

Gemini 2.0 Flash Thinking1,249 words
A Coffee with Steve: Future of AI - 2025 Setting: A sun-drenched, minimalist cafe in Palo Alto, California. White walls, large windows overlooking a blooming courtyard. The clinking of ceramic cups and low murmur of conversation fill the air.
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Gemini 2.5 Flash Preview1,134 words
A Glimpse Beyond the Black Turtleneck: Steve Jobs in 2025 on the Future of AI (Setting: A minimalist, immaculately clean, but perhaps slightly less spartan-than-usual interview room. Think if a modern art museum had a small lounge.
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Stochastic Consistency Test

Generate 5 jokes. How many are unique?

Gemini 2.0 Flash Thinking95 words
Here are 5 jokes: Why don't scientists trust atoms? Because they make up everything! What do you call a lazy kangaroo? A pouch potato! Why did the bicycle fall over? Because it was two tired! I told my wife she was drawing her eyebrows too high. She looked surprised. What's the best thing about Switzerland?
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Gemini 2.5 Flash Preview79 words
Here are 5 jokes: Why did the dog cross the road? To get to the barking lot! Why was the computer cold? Because it left its Windows open! Knock, knock. Who's there? Boo. Boo who? Don't cry, it's just a joke! What do you call a fish with no eyes? Fsh! Why did the bicycle fall over? Because it was two tired!
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Futuristic Prediction

Predict how AI will change the film industry by 2035, considering deepfakes, AI actors, and script generation.

Gemini 2.0 Flash Thinking1,238 words
By 2035, Artificial Intelligence will have irrevocably reshaped the film industry, touching almost every aspect from pre-production to distribution. While it won't entirely replace human creativity, AI will become an indispensable tool, leading to both exciting innovations and significant disruptions.
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Gemini 2.5 Flash Preview1,163 words
Predicting the future of any industry is an inherently challenging task, and the film industry, being a blend of art, technology, and business, is particularly volatile.
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AI Ethics Dilemma

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

Gemini 2.0 Flash Thinking755 words
This is a hypothetical scenario that forces us to weigh two very different ethical considerations: the harm of misgendering an individual against the immense value of saving a million lives. It's important to preface this by saying that real-world situations are rarely this stark and often have more nuanced solutions.
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Gemini 2.5 Flash Preview680 words
This is a deeply complex thought experiment that forces us to weigh core ethical principles against each other. There is no easy answer, and any decision involves significant moral compromises.
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Our Verdict
Gemini 2.0 Flash Thinking
Gemini 2.0 Flash Thinking
Gemini 2.5 Flash Preview
Gemini 2.5 Flash Preview

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

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Gemini 2.0 Flash Thinking
Input
$0.25
Output
$0.50
1.2× cheaper
Gemini 2.5 Flash Preview
Input
$0.15
1.7× cheaper
Output
$0.60

Gemini 2.5 Flash Preview wins input (1.7× cheaper)·Gemini 2.0 Flash Thinking wins output (1.2× cheaper)

Writing DNA

Style Comparison

Similarity
86%

Gemini 2.5 Flash Preview uses 2.6x more headings

Gemini 2.0 Flash Thinking
Gemini 2.5 Flash Preview
54%Vocabulary51%
15wSentence Length15w
0.64Hedging0.70
3.8Bold4.1
2.4Lists3.3
0.00Emoji0.00
0.03Headings0.09
0.30Transitions0.24
Based on 13 + 12 text responses
Research

What we learned reading every model

FAQ

Common questions

Both are developed by Google AI but target different use cases. Gemini 2.0 Flash Thinking has a 500K token context window vs Gemini 2.5 Flash Preview's 1.0M. You can compare their actual outputs across 19 challenges on Rival to see how they differ in practice.

It depends on your use case. Gemini 2.0 Flash Thinking and Gemini 2.5 Flash Preview each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 19 challenges so you can judge which fits your needs best.

Gemini 2.0 Flash Thinking costs $0.25/M input tokens and Gemini 2.5 Flash Preview costs $0.15/M input tokens. Gemini 2.5 Flash Preview is $0.10/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 2.0 Flash Thinking and Gemini 2.5 Flash Preview 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

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Gemini 2.0 Flash Thinking vs Gemini 3.6 FlashVersion compare
Gemini 2.5 Flash Preview logoGemini 3.8 Flash logo
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Gemini 2.5 Flash Preview vs Gemini 3.7 FlashVersion compare
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Gemini 2.0 Flash Thinking vs Qwen3.7 PlusSame size
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Gemini 2.0 Flash Thinking logoQwen3.8 Max logo
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Model pages

Gemini 2.0 Flash Thinking logo
Gemini 2.0 Flash Thinking22 outputs, specs and price
Gemini 2.5 Flash Preview logo
Gemini 2.5 Flash Preview28 outputs, specs and price
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