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  5. Gemini 2.5 Flash PreviewvsGLM 5.3 FlashX
Updated Sep 2026

Gemini 2.5 Flash PreviewvsGLM 5.3 FlashX

Gemini 2.5 Flash Preview is cheaper than GLM 5.3 FlashX at $0.15/M vs $0.37/M input tokens.

Gemini 2.5 Flash Preview and GLM 5.3 FlashX compared across 2 shared prompts
SpecGemini 2.5 Flash PreviewGLM 5.3 FlashX
Input price$0.15/M tokens$0.37/M tokens
Output price$0.6/M tokens$1.25/M tokens
Context window1.0M tokens1.0M tokens
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 Preview221 words
Dish Name: Sunshine Lemon-Ricotta Mugs (Sweet & Simple!) This light and flavorful dessert comes together quickly for a little sweet treat . Ingredients (7 Common Pantry Staples): Ricotta cheese (whole milk or part-skim) Granulated sugar Lemon zest (from one lemon) Vanilla extract All-purpose flour Baking powder Large…
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GLM 5.3 FlashX172 words
Golden Honey Garlic Chickpea Crunch A crispy, sweet-savory skillet dish that works as a snack, side, or topping for rice. Ingredients (7): 1 can chickpeas (drained, patted dry) 3 tbsp honey 3 tbsp soy sauce 3 cloves garlic (minced) 2 tbsp olive oil ½ tsp red pepper flakes 2 tbsp sesame seeds (or crushed peanuts) Prep…
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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 Preview960 words
<s) with practical, beginner-friendly tips for each.\"\nHere\'s a simple, actionable 1-month plan for someone starting their journey towards better health and longev\nity, focusing on three key areas: Diet, Movement, and Sleep.\n\nThis plan is designed to be beginner-friendly and build sustainable habits.
Read the full answer
GLM 5.3 FlashX347 words
1-Month Health & Longevity Starter Plan Week 1: Build the Foundation 🥗 Diet Add one vegetable or fruit to every meal (don't restrict anything yet) Drink a glass of water when you wake up each morning 🏃 Exercise Take a 10–15 minute walk daily (same time each day builds the habit) Do 2 sets of 5 squats and 10 wall…
Read the full answer
Our Verdict
GLM 5.3 FlashX
GLM 5.3 FlashX
Gemini 2.5 Flash Preview
Gemini 2.5 Flash PreviewRunner-up

Not enough votes to call it. On the specs, GLM 5.3 FlashX has the edge: bigger model tier, newer.

Too close to call
API pricing

Cost per 1M tokens

Gemini 2.5 Flash Preview
Input
$0.15
2.5× cheaper
Output
$0.60
2.1× cheaper
GLM 5.3 FlashX
Input
$0.37
Output
$1.25

Gemini 2.5 Flash Preview is cheaper on both: 2.5× input, 2.1× output.

Where to run it

1 host

Gemini 2.5 Flash Preview

No hosts listed on OpenRouter.

GLM 5.3 FlashX1 host
HostInOutContextUptime
Z.aifp8$0.37 in·$1.25 out·1M·100% up

Per million tokens. Prices and uptime via OpenRouter, checked 23 Sep 2026.

Research

What we learned reading every model

FAQ

Common questions

Gemini 2.5 Flash Preview is developed by Google AI while GLM 5.3 FlashX is developed by Zhipu AI. Gemini 2.5 Flash Preview has a 1.0M token context window vs GLM 5.3 FlashX's 1.0M. 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 and GLM 5.3 FlashX 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 costs $0.15/M input tokens and GLM 5.3 FlashX costs $0.37/M input tokens. Gemini 2.5 Flash Preview is $0.22/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 and GLM 5.3 FlashX 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

Gemini 2.5 Flash Preview logoGemini 3.8 Flash logo
Gemini 2.5 Flash Preview vs Gemini 3.8 FlashSame lab
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Gemini 2.5 Flash Preview vs Gemini 3.7 FlashVersion compare
GLM 5.3 FlashX logoGLM 5.3 logo
GLM 5.3 FlashX vs GLM 5.3Same lab
GLM 5.3 FlashX logoGLM 5.3 Flash logo
GLM 5.3 FlashX vs GLM 5.3 FlashSame lab
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GLM 5.3 FlashX vs o1New provider
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GLM 5.3 FlashX vs OpenAI o3New provider
GLM 5.3 FlashX logoo3 Mini logo
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GLM 5.3 FlashX vs OpenAI o4-miniNew provider

Model pages

Gemini 2.5 Flash Preview logo
Gemini 2.5 Flash Preview28 outputs, specs and price
GLM 5.3 FlashX logo
GLM 5.3 FlashX12 outputs, specs and price
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