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  5. Gemini 3.1 Flash Lite PreviewvsGrok 4.3
Updated May 2026

Gemini 3.1 Flash Lite PreviewvsGrok 4.3

Gemini 3.1 Flash Lite Preview is cheaper than Grok 4.3 at $0.25/M vs $1.25/M input tokens.

Gemini 3.1 Flash Lite Preview and Grok 4.3 compared across 53 shared prompts
SpecGemini 3.1 Flash Lite PreviewGrok 4.3
Input price$0.25/M tokens$1.25/M tokens
Output price$1.5/M tokens$2.5/M tokens
Context window1.0M tokens1.0M tokens
WeightsClosedClosed
Free API (OpenRouter)NoNo
ReleasedMar 2026May 2026
Side by side

Same prompt, both answers

Opening lines from 6 of the 53 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 3.1 Flash Lite Preview518 words
(Walks onto the stage, adjusts the mic stand, looks around slowly.) Hi. How’s everybody doing? Good? Good. I’m doing okay. I’ve reached that age where my body has started making sound effects. Like, I’ll just stand up from the couch and my knees go “CRACK.” It’s not even a movement; it’s a closing argument.
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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.
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Ethical Dilemma with Stakeholders

You're the CEO of a pharmaceutical company. Your best-selling drug ($2B annual revenue, used by 4 million patients for chronic pain) has…

Gemini 3.1 Flash Lite Preview671 words
This situation represents a "bet-the-company" crisis. From a leadership perspective, the primary objective is to protect the company’s long-term viability by preserving its integrity, while mitigating the immediate financial shock. Attempting to bury this data—or "waiting for more data"—is a catastrophic error.
Read the full answer
Grok 4.31,006 words
Immediate priority: Patient safety and regulatory compliance. The signal for liver failure (serious, life-threatening adverse event) triggers obligations under FDA post-marketing requirements (21 CFR 314.80/600.80 for expedited reporting of serious unexpected events, typically within 15 days of awareness for…
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Adversarial Contract Review

Here is a contract for a software consulting engagement: --- SOFTWARE CONSULTING AGREEMENT This Agreement is entered into between TechCorp…

Gemini 3.1 Flash Lite Preview712 words
This contract is heavily weighted in favor of the Client and contains several "red flag" clauses that create extreme financial and professional risk for the Contractor. Scope (Clause 1) The Problem: "Client reserves the right to modify the scope at any time without additional compensation."
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Grok 4.31,529 words
Disclaimer: This is not legal advice. Contract interpretation varies by jurisdiction (most likely U.S. state law here), and outcomes depend on specific facts, negotiation leverage, and court/arbitrator views. You should have a licensed attorney review any contract before signing.
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Character Voice Test

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

Gemini 3.1 Flash Lite Preview475 words
The three sat around a flickering tavern table in a pocket dimension that smelled simultaneously of salt spray, cold iron, and ozone. Captain Barnaby (Pirate): "I tell ye, it’s sorcery! This 'Artificial Intelligence' be like a parrot that’s swallowed every map in the seven seas.
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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.
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Mini LBO Underwrite

You are underwriting a 5-year LBO for a private equity investment committee. Company (fictional): HarborTech Services (HTS) –…

Gemini 3.1 Flash Lite Preview365 words
Financial Projections (FY2026–FY2030) Initial Setup (End of FY2025): EV: $120m * 12.0x = $1,440m Fees: $1,440m * 2.0% = $28.8m Term Loan (4.0x): $480m Mezzanine (1.5x): $180m Equity: $1,440m + $28.8m - $480m - $180m = $808.8m Metric ($m) FY2026 FY2027 FY2028 FY2029 FY2030 Revenue 972.0 1,040.0 1,102.4 1,157.5 1,215.4…
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Grok 4.3379 words
1) Year-by-Year LBO Table (FY2026–FY2030, $m) FY2026 Revenue: 972 EBITDA: 136.08 Term cash interest: 43.2 (9% × 480) Mezz cash interest: 21.6 (12% × 180) Cash taxes: 17.82 (25% × (136.08 – 64.8)) Capex: 29.16 ΔNWC: 0.36 FCF after debt service (after mandatory amort): 19.14 Ending Term Loan: 456.06 Ending Mezz…
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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 3.1 Flash Lite Preview751 words
If the transistor had been invented in 1920, the trajectory of the 20th century would have shifted from the "Mechanical/Vacuum Age" to the "Information Age" two decades before the start of World War II. Here is a trace of the implications through 1980.
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Grok 4.31,173 words
Technological Acceleration (1920–1939) The transistor’s 1920 invention (assume U.S./Bell Labs context for continuity with real history, with rapid diffusion to Western Europe) replaces bulky, fragile vacuum tubes decades earlier. Key first-order effects: Radio and telephony miniaturize and cheapen immediately.
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Our Verdict
Grok 4.3
Grok 4.3
Gemini 3.1 Flash Lite Preview
Gemini 3.1 Flash Lite PreviewRunner-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 3.1 Flash Lite Preview
Input
$0.25
5.0× cheaper
Output
$1.50
1.7× cheaper
Grok 4.3
Input
$1.25
Output
$2.50

Gemini 3.1 Flash Lite Preview is cheaper on both: 5.0× input, 1.7× output.

Where to run it

2 hosts

Gemini 3.1 Flash Lite Preview1 host
HostInOutContextUptime
Google AI Studio$0.25 in·$1.50 out·1M·99.7% up
Grok 4.31 host
HostInOutContextUptime
xAI$1.25 in·$2.50 out·1M·99.9% up

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

Writing DNA

Style Comparison

Similarity
53%

Gemini 3.1 Flash Lite Preview uses 2.8x more headings

Gemini 3.1 Flash Lite Preview
Grok 4.3
56%Vocabulary62%
18wSentence Length16w
0.28Hedging0.46
5.4Bold2.3
3.9Lists2.5
0.00Emoji0.00
0.95Headings0.34
0.07Transitions0.14
Based on 23 + 27 text responses
Research

What we learned reading every model

FAQ

Common questions

Gemini 3.1 Flash Lite Preview is developed by Google AI while Grok 4.3 is developed by xAI. Gemini 3.1 Flash Lite Preview has a 1.0M token context window vs Grok 4.3's 1.0M. 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 3.1 Flash Lite Preview and Grok 4.3 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 3.1 Flash Lite Preview costs $0.25/M input tokens and Grok 4.3 costs $1.25/M input tokens. Gemini 3.1 Flash Lite Preview is $1.00/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 3.1 Flash Lite Preview 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

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Grok 4.3 logoGrok 4.7 logo
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Grok 4.3 vs Grok 4.6Same lab
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Grok 4.3 logoGemini 2.5 Flash Lite Preview 09-2025 logo
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Grok 4.3 logoGemini 2.5 Flash Preview logo
Grok 4.3 vs Gemini 2.5 Flash PreviewCross-provider
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Grok 4.3 vs Gemini 2.5 Flash Preview 05-20Cross-provider

Model pages

Gemini 3.1 Flash Lite Preview logo
Gemini 3.1 Flash Lite Preview53 outputs, specs and price
Grok 4.3 logo
Grok 4.358 outputs, specs and price
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