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  5. Gemini 2.5 Flash Preview (thinking)vsGPT-6 Luna
Updated Sep 2026

Gemini 2.5 Flash Preview (thinking)vsGPT-6 Luna

GPT-6 Luna is cheaper than Gemini 2.5 Flash Preview (thinking) at $0.1/M vs $0.175/M input tokens.

Gemini 2.5 Flash Preview (thinking) and GPT-6 Luna compared across 2 shared prompts
SpecGemini 2.5 Flash Preview (thinking)GPT-6 Luna
Input price$0.175/M tokens$0.1/M tokens
Output price$3.5/M tokens$0.5/M tokens
Context window1.0M tokens1.1M tokens
Weights—Closed
Free API (OpenRouter)NoNo
ReleasedApr 2025Sep 2026
Side by side

Same prompt, both answers

Opening lines from every prompt 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…

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
GPT-6 Luna113 words
Crispy Parmesan Chickpeas A crunchy, savory snack with a cheesy finish Ingredients (7): 1 can chickpeas, drained and dried 1 tablespoon olive oil ½ teaspoon salt ½ teaspoon paprika ¼ teaspoon garlic powder ¼ cup grated Parmesan 1 tablespoon lemon juice Prep time: 5 minutes Cook time: 30–35 minutes Instructions: Heat…
Read the full answer

Beginner's Longevity Plan

Outline a simple, actionable 1-month plan for someone starting their journey towards better health and longevity. Focus on 3 key areas…

Gemini 2.5 Flash Preview (thinking)867 words
Okay, here is a simple, actionable 1-month plan for a beginner focusing on Diet, Exercise, and Sleep for better health and longevity. Goal: To build foundational, sustainable habits in 3 key health areas over 30 days.
Read the full answer
GPT-6 Luna330 words
A simple 1-month starter plan Choose three foundations: food, movement, and sleep. Aim for steady habits, not perfection. If you have a health condition, significant pain, or concerns about changing your activity or diet, check with a healthcare professional first.
Read the full answer
Our Verdict
GPT-6 Luna
GPT-6 Luna
Gemini 2.5 Flash Preview (thinking)
Gemini 2.5 Flash Preview (thinking)Runner-up

Not enough votes to call it. On the specs, GPT-6 Luna has the edge: bigger model tier, newer.

GPT-6 Luna costs 7.0x less per token.

Too close to call
API pricing

Cost per 1M tokens

Gemini 2.5 Flash Preview (thinking)
Input
$0.17
Output
$3.50
GPT-6 Luna
Input
$0.10
1.7× cheaper
Output
$0.50
7.0× cheaper

GPT-6 Luna is cheaper on both: 1.7× input, 7.0× output.

Where to run it

3 hosts, cheapest first

Gemini 2.5 Flash Preview (thinking)

No hosts listed on OpenRouter.

GPT-6 Luna3 hosts
HostInOutContextUptime
Azure AI Foundry$0.10 in·$0.50 out·1.1M·88.4% upOpenAI$0.10 in·$0.50 out·1.1M·99.9% upAmazon Bedrock$0.11 in·$0.55 out·1.1M·99.8% up

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

Research

What we learned reading every model

FAQ

Common questions

Gemini 2.5 Flash Preview (thinking) is developed by Google AI while GPT-6 Luna is developed by OpenAI. Gemini 2.5 Flash Preview (thinking) has a 1.0M token context window vs GPT-6 Luna's 1.1M. You can compare their actual outputs across 2 challenges on Rival to see how they differ in practice.

It depends on your use case. Gemini 2.5 Flash Preview (thinking) and GPT-6 Luna each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 2 challenges so you can judge which fits your needs best.

Gemini 2.5 Flash Preview (thinking) costs $0.175/M input tokens and GPT-6 Luna costs $0.1/M input tokens. GPT-6 Luna is $0.07/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 GPT-6 Luna 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

More comparisons

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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
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Gemini 2.5 Flash Preview (thinking) vs Gemini 3.7 FlashVersion compare
GPT-6 Luna logoGPT-6 Luna Pro logo
GPT-6 Luna vs GPT-6 Luna ProSame lab
GPT-6 Luna logoGPT-6 Sol logo
GPT-6 Luna vs GPT-6 SolSame lab
Gemini 2.5 Flash Preview (thinking) logoGPT-5.4 Mini logo
Gemini 2.5 Flash Preview (thinking) vs GPT-5.4 MiniSame size
Gemini 2.5 Flash Preview (thinking) logoGPT-5.4 Nano logo
Gemini 2.5 Flash Preview (thinking) vs GPT-5.4 NanoCross-provider
Gemini 2.5 Flash Preview (thinking) logoGPT-5.4 Pro logo
Gemini 2.5 Flash Preview (thinking) vs GPT-5.4 ProCross-provider
Gemini 2.5 Flash Preview (thinking) logoGPT-5.5 logo
Gemini 2.5 Flash Preview (thinking) vs GPT-5.5Cross-provider

Model pages

Gemini 2.5 Flash Preview (thinking) logo
Gemini 2.5 Flash Preview (thinking)20 outputs, specs and price
GPT-6 Luna logo
GPT-6 Luna20 outputs, specs and price
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