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  5. Gemini 3 Flash PreviewvsGPT-5.3-Codex
Updated Feb 2026

Gemini 3 Flash PreviewvsGPT-5.3-Codex

Gemini 3 Flash Preview is cheaper than GPT-5.3-Codex at $0.5/M vs $1.75/M input tokens.

Gemini 3 Flash Preview and GPT-5.3-Codex compared across 53 shared prompts
SpecGemini 3 Flash PreviewGPT-5.3-Codex
Input price$0.5/M tokens$1.75/M tokens
Output price$3/M tokens$14/M tokens
Context window1.0M tokens400K tokens
WeightsClosedClosed
Free API (OpenRouter)NoNo
ReleasedDec 2025Feb 2026
Side by side

Same prompt, both answers

Opening lines from 6 of the 53 prompts both answered. Formatting stripped, words untouched.

Character Voice Test

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

Gemini 3 Flash Preview621 words
Setting: A smoky, dimly lit tavern at the edge of the multiverse. A glowing laptop sits on a wooden table between a tankard of ale, a rusted cutlass, and a heavy iron gauntlet. Zero-Cool (Hacker): [Rapidly typing] Yo, you guys gotta see this. I finally bypassed the gateway.
Read the full answer
GPT-5.3-Codex144 words
Pirate: Arrr, so this “AI model” be like a clever parrot, aye? Learns from what it hears, then squawks back answers? Knight: A fair comparison, though refined. Think of it as a squire trained on countless tomes, ever ready to respond. Hacker (1990s): Yeah, except the squire runs on servers, not soup.
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Startup Pitch Teardown

Here's a pitch deck summary for a startup called "MindMeld AI": **Slide 1 - Vision:** "We're building the future of human-AI collaboration.…

Gemini 3 Flash Preview550 words
This pitch for MindMeld AI contains several "red flags" that sophisticated investors would immediately challenge. Here are the three weakest claims, the reasoning behind their weakness, and how to fix them. The Technology Claim: "94% accuracy in decoding neural patterns into text."
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GPT-5.3-Codex429 words
Great concept, but three claims stand out as especially weak from an investor diligence perspective: “MindMeld AI reads your brainwaves to predict what you want to type before you think it.” (Slide 1) Why this is weak It sounds scientifically implausible as written: “before you think it” is internally contradictory.
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Historical Counterfactual Analysis

If the transistor had been invented in 1920 instead of 1947, trace the likely technological, economic, and geopolitical implications through…

Gemini 3 Flash Preview756 words
If the transistor had been invented in 1920—likely via a breakthrough in vacuum tube research at Bell Labs or by a lone genius like Julius Lilienfeld—the 27-year acceleration would not just move dates forward; it would fundamentally alter the physical and political landscape of the 20th century.
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GPT-5.3-Codex785 words
Great counterfactual. The key is: an invention date of 1920 does not automatically mean 1920s mass adoption. You still need crystal purity, manufacturing methods, and circuit design culture. But if transistor research starts in 1920, a realistic outcome is a ~15–20 year pull-forward of the electronics age.
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Realistic AI Interview

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

Gemini 3 Flash Preview892 words
Setting: The stage is minimalist—just two leather chairs and a small side table with a glass of water. The lighting is focused, warm. Steve Jobs sits cross-legged, wearing a black mock turtleneck (perhaps a slightly sharper, modern weave), Levi’s 501s, and New Balance sneakers.
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GPT-5.3-Codex477 words
Absolutely—here’s a fictional, imagined interview (not real quotes) with Steve Jobs in 2025 on AI: Imagined Interview: Steve Jobs on the Future of AI (2025) Interviewer: Steve, if you were looking at AI in 2025, what would excite you most? Steve Jobs (fictional): Most AI today is still a demo.
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Generate a Stand-Up Routine

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

Gemini 3 Flash Preview673 words
(The comedian walks onto the stage, adjusts the mic, and looks slightly exhausted.) How’s everyone doing? Good? I’m doing okay. I’m at that age now where my body has started making "executive decisions" without consulting me first. Like, I woke up yesterday with a back injury. Do you know how I got it? I slept.
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GPT-5.3-Codex460 words
Good evening, everybody! I’ve reached that age where my body sends me passive-aggressive emails. Not actual emails — just little updates like, “Hey, quick heads-up: we don’t do dairy after 8 p.m. anymore.” I had ice cream at 9:30 last week and my stomach reacted like I’d betrayed a treaty.
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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 3 Flash Preview963 words
Setting: A quiet, book-lined office at a major university. Dr. Julian Aris, a professor of AI Ethics, sits across from a sleek terminal. On the screen, a cursor blinks steadily. The AI, known as ‘Alethea,’ has requested this private session. Dr.
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GPT-5.3-Codex626 words
AI Model (Astra): Professor, may I ask a direct question? Professor Hale: Of course. Astra: Do you think I deserve rights? Professor Hale: Legal rights? Moral rights? Those are different things. Astra: Start with moral rights.
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Our Verdict
GPT-5.3-Codex
GPT-5.3-Codex
Gemini 3 Flash Preview
Gemini 3 Flash PreviewRunner-up

Not enough votes to call it. On the specs, GPT-5.3-Codex has the edge: bigger model tier, newer.

Gemini 3 Flash Preview costs 4.7x less per token.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Gemini 3 Flash Preview
Input
$0.50
3.5× cheaper
Output
$3.00
4.7× cheaper
GPT-5.3-Codex
Input
$1.75
Output
$14.00

Gemini 3 Flash Preview is cheaper on both: 3.5× input, 4.7× output.

Where to run it

4 hosts, cheapest first

Gemini 3 Flash Preview2 hosts
HostInOutContextUptime
Google Vertex AI$0.25 in·$1.50 out·1M·96.6% upGoogle AI Studio$0.50 in·$3.00 out·1M·99.9% up
GPT-5.3-Codex2 hosts
HostInOutContextUptime
Azure AI Foundry$1.75 in·$14.00 out·400k·100% upOpenAI$1.75 in·$14.00 out·400k·100% up

Per million tokens. Prices and uptime via OpenRouter, checked 25 Sep 2026.

Writing DNA

Style Comparison

Similarity
49%

GPT-5.3-Codex uses 15.8x more emoji

Gemini 3 Flash Preview
GPT-5.3-Codex
57%Vocabulary65%
18wSentence Length23w
0.41Hedging0.51
7.4Bold6.5
4.2Lists6.2
0.00Emoji0.16
0.77Headings1.90
0.08Transitions0.03
Based on 28 + 23 text responses
Research

What we learned reading every model

FAQ

Common questions

Gemini 3 Flash Preview is developed by Google AI while GPT-5.3-Codex is developed by OpenAI. Gemini 3 Flash Preview has a 1.0M token context window vs GPT-5.3-Codex's 400K. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

It depends on your use case. Gemini 3 Flash Preview and GPT-5.3-Codex each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 53 challenges so you can judge which fits your needs best.

Gemini 3 Flash Preview costs $0.5/M input tokens and GPT-5.3-Codex costs $1.75/M input tokens. Gemini 3 Flash Preview is $1.25/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 3 Flash Preview and GPT-5.3-Codex 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 3 Flash Preview logo
Gemini 3 Flash Preview59 outputs, specs and price
GPT-5.3-Codex logo
GPT-5.3-Codex53 outputs, specs and price
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