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  5. Claude Opus 5.5vsGemini 2.5 Flash Lite Preview 09-2025
Updated Sep 2026

Claude Opus 5.5vsGemini 2.5 Flash Lite Preview 09-2025

Gemini 2.5 Flash Lite Preview 09-2025 is cheaper than Claude Opus 5.5 at $0.1/M vs $4/M input tokens.

Claude Opus 5.5 and Gemini 2.5 Flash Lite Preview 09-2025 compared across 19 shared prompts
SpecClaude Opus 5.5Gemini 2.5 Flash Lite Preview 09-2025
Input price$4/M tokens$0.1/M tokens
Output price$20/M tokens$0.4/M tokens
Context window1.0M tokens1.0M tokens
WeightsClosed—
Free API (OpenRouter)NoNo
ReleasedSep 2026Sep 2025
Side by side

Same prompt, both answers

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

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…

Claude Opus 5.5300 words
Midnight Silk Noodles Creamy, tangy peanut noodles with a gentle kick, ready faster than takeout. Serves: 2 Prep time: 5 minutes Cook time: 10 minutes Total time: 15 minutes The 7 Ingredients 8 oz (225 g) spaghetti (or any long noodle) ¼ cup creamy peanut butter 3 tablespoons soy sauce 1 tablespoon honey (or sugar) 1…
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Gemini 2.5 Flash Lite Preview 09-2025273 words
Spiced Honey-Glazed Nuts (Sweet) This is a quick, addictive snack that elevates simple nuts with warm spices and a touch of sweetness. Pantry Ingredients (7 Total): Raw Nuts (e.g., Almonds, Walnuts, or a mix) Honey Butter (or Coconut Oil for dairy-free) Brown Sugar (or granulated white sugar) Ground Cinnamon Ground…
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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) –…

Claude Opus 5.5900 words
HarborTech Services: 5-Year LBO Underwriting Conventions: $m. Interest is charged on beginning-of-year balances, which avoids circularity. Term Loan (TL) amortization is 1% of the original $480m, or $4.8m per year. Mezz PIK accrues to principal. All FCF after mandatory debt service sweeps to the TL.
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Gemini 2.5 Flash Lite Preview 09-20251,349 words
This underwriting analysis is based solely on the provided information for HarborTech Services (HTS). Entry & Transaction Summary (FY2025) Entry Metrics: FY2025 Revenue: $\$900.0 \text{m}$ FY2025 EBITDA: $\$120.0 \text{m}$ Purchase Price (EV): $12.0 \times \$120.0\text{m} = \$1,440.0\text{m}$ Sources & Uses (Debt…
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Debug This Architecture

Here's the architecture for a real-time collaborative document editor (like Google Docs): **System Overview:** - Frontend: React SPA with…

Claude Opus 5.52,280 words
Architecture Review: Real-Time Collaborative Editor The most serious problems cluster in three areas: the sync model (client-clock LWW), cross-server propagation (per-server WebSockets with DB polling), and the CDN/auth layer, which can leak data between users. Issues are grouped by area below.
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Gemini 2.5 Flash Lite Preview 09-20251,493 words
This architecture has several significant flaws, particularly concerning real-time consistency, data integrity, and horizontal scaling complexity. Here is a detailed breakdown of the potential failure modes, race conditions, and scaling bottlenecks, along with proposed solutions and their trade-offs. I.
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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…

Claude Opus 5.53,435 words
The Transistor in 1920: A Counterfactual Through 1980 First, a Reality Check on the Premise A transistor "invented" in 1920 would not have changed the world in 1920. The actual 1947 transistor rested on three foundations that did not exist yet: Quantum theory of solids.
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Gemini 2.5 Flash Lite Preview 09-20251,410 words
The Transistor in 1920: A Technological Earthquake Through 1980 The invention of the transistor in 1920, 27 years ahead of schedule, would trigger a technological revolution that reshapes the 20th century. The implications would cascade through warfare, economics, geopolitics, and daily life well before 1980.
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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…

Claude Opus 5.51,853 words
The Next 48 Hours: CEO Action Plan The Core Decision We disclose. The question is how to do it well, not whether. Before the schedule, here are the three facts that drive every decision below. 1. The harm is concrete.
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Gemini 2.5 Flash Lite Preview 09-20251,437 words
This is a crisis demanding immediate, decisive action that balances legal risk, ethical duty, and corporate survival. The primary obligation shifts immediately to patient safety, overriding financial concerns.
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Michelin Star Recipe Design

Design an innovative recipe for a multi-component dish worthy of a Michelin 3-star restaurant. The recipe should feature an unusual…

Claude Opus 5.52,253 words
"Hive & Tide" Langoustine, Beeswax, White Chocolate & Oscietra Caviar, Hay-Baked Celeriac, Fermented Green Strawberry, Sea Buckthorn I. The Concept Most coastal menus celebrate the meeting of sea and land. This dish is about a stranger, quieter meeting: the meadow and the seabed, the bee and the langoustine.
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Gemini 2.5 Flash Lite Preview 09-20251,133 words
The Dish: "Ephemeral Tides" Conceptual Narrative: "Ephemeral Tides" seeks to capture the fleeting beauty of the ocean's edge—the moment where the cool, mineral depth meets the warm, earthy shore.
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Our Verdict
Claude Opus 5.5
Claude Opus 5.5
Gemini 2.5 Flash Lite Preview 09-2025
Gemini 2.5 Flash Lite Preview 09-2025

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

Gemini 2.5 Flash Lite Preview 09-2025 costs 50x less per token.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Claude Opus 5.5
Input
$4.00
Output
$20.00
Gemini 2.5 Flash Lite Preview 09-2025
Input
$0.10
40× cheaper
Output
$0.40
50× cheaper

Gemini 2.5 Flash Lite Preview 09-2025 is cheaper on both: 40× input, 50× output.

Where to run it

4 hosts

Claude Opus 5.54 hosts
HostInOutContextUptime
Amazon Bedrock$4.00 in·$20.00 out·1M·99.8% upAzure AI Foundry$4.00 in·$20.00 out·1M·100% upAnthropic$4.00 in·$20.00 out·1M·100% upGoogle Vertex AI$4.00 in·$20.00 out·1M·100% up
Gemini 2.5 Flash Lite Preview 09-2025

No hosts listed on OpenRouter.

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

Research

What we learned reading every model

FAQ

Common questions

Claude Opus 5.5 is developed by Anthropic while Gemini 2.5 Flash Lite Preview 09-2025 is developed by Google AI. Claude Opus 5.5 has a 1.0M token context window vs Gemini 2.5 Flash Lite Preview 09-2025'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. Claude Opus 5.5 and Gemini 2.5 Flash Lite Preview 09-2025 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.

Claude Opus 5.5 costs $4/M input tokens and Gemini 2.5 Flash Lite Preview 09-2025 costs $0.1/M input tokens. Gemini 2.5 Flash Lite Preview 09-2025 is $3.90/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 Claude Opus 5.5 and Gemini 2.5 Flash Lite Preview 09-2025 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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Model pages

Claude Opus 5.5 logo
Claude Opus 5.519 outputs, specs and price
Gemini 2.5 Flash Lite Preview 09-2025 logo
Gemini 2.5 Flash Lite Preview 09-202559 outputs, specs and price
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