What is the difference between Gemini 1.5 Pro and GLM 5.3 Flash?

Gemini 1.5 Pro is developed by Google AI while GLM 5.3 Flash is developed by Zhipu AI. Gemini 1.5 Pro has a 1.0M token context window vs GLM 5.3 Flash's 1.3M. You can compare their actual outputs across 1 challenges on Rival to see how they differ in practice.

Which is better, Gemini 1.5 Pro or GLM 5.3 Flash?

It depends on your use case. Gemini 1.5 Pro and GLM 5.3 Flash each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 1 challenges so you can judge which fits your needs best.

How much does Gemini 1.5 Pro cost compared to GLM 5.3 Flash?

Gemini 1.5 Pro costs $3.5/M input tokens and GLM 5.3 Flash costs $0.15/M input tokens. GLM 5.3 Flash is $3.35/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

How can I compare Gemini 1.5 Pro and GLM 5.3 Flash on Rival?

This page shows a side-by-side comparison of Gemini 1.5 Pro and GLM 5.3 Flash 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.

Updated Aug 2026

Gemini 1.5 ProvsGLM 5.3 Flash

GLM 5.3 Flash is cheaper than Gemini 1.5 Pro at $0.15/M vs $3.5/M input tokens.

Gemini 1.5 Pro and GLM 5.3 Flash compared across 1 shared prompts
Spec	Gemini 1.5 Pro	GLM 5.3 Flash
Input price	$3.5/M tokens	$0.15/M tokens
Output price	$10.5/M tokens	$0.5/M tokens
Context window	1.0M tokens	1.3M tokens
Weights	—	Open
Free API (OpenRouter)	No	No
Released	Feb 2024	Aug 2026

Our Verdict

Gemini 1.5 Pro

GLM 5.3 Flash

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

GLM 5.3 Flash costs 21x less per token.

Too close to call

API pricing

Cost per 1M tokens

Gemini 1.5 Pro

Input

$3.50

Output

$10.50

GLM 5.3 Flash

Input

$0.15

23× cheaper

Output

$0.50

21× cheaper

GLM 5.3 Flash is cheaper on both: 23× input, 21× output.

Where to run it

30 hosts, cheapest first

Gemini 1.5 Pro

No hosts listed on OpenRouter.

GLM 5.3 Flash30 hosts

HostInOutContextUptime

DeepInfrafp4$0.07 in$0.25 out1M99.1% up GMI Cloudfp8$0.07 in$0.25 out1M99.2% up Morph$0.08 in$0.28 out1M100% up InferenceNetfp4$0.09 in$0.28 out1M97.2% up Wafer$0.10 in$0.35 out1M99.8% up OpenInferencefp4$0.10 in$0.50 out1M98.2% up

24 more hosts

Relace$0.11 in$0.36 out1M99.7% up Phalafp8$0.13 in$0.42 out1M99.5% up Novitafp8$0.13 in$0.44 out1M99.4% up StreamLakefp8$0.14 in$0.47 out1M99% up Sail Researchfp8$0.14 in$0.47 out1M99% up AtlasCloudfp8$0.15 in$0.50 out1M99.6% up Basetenfp8$0.15 in$0.50 out1M99.1% up Cloudflare Workers AI$0.15 in$0.50 out1.3M99.8% up CoreWeavenvfp4$0.15 in$0.50 out1M99.5% up DigitalOcean$0.15 in$0.50 out1M94.4% up Fireworks$0.15 in$0.50 out1M99.1% up Friendli$0.15 in$0.50 out1M98.7% up Inceptronfp8$0.15 in$0.50 out1M98.2% up io.netfp8$0.15 in$0.50 out262k99.2% up Near AIfp8$0.15 in$0.50 out1M98.9% up Rekafp8$0.15 in$0.50 out262k98.9% up SiliconFlowfp8$0.15 in$0.50 out1M99.7% up Together$0.15 in$0.50 out1M99.5% up Venice$0.15 in$0.50 out1M98.7% up Z.aifp8$0.15 in$0.50 out1M96.6% up NextBitfp8$0.18 in$0.60 out1M98% up Modalfp8$0.45 in$1.50 out1M99.6% up Crusoefp4degraded$0.15 in$0.50 out1M93% up Parasailfp8degraded$0.15 in$0.50 out1M98.7% up

Per million tokens. Prices and uptime via OpenRouter, checked 22 Sep 2026.

Research

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Cost per 1M tokens

30 hosts, cheapest first

What we learned reading every model

Common questions

What is the difference between Gemini 1.5 Pro and GLM 5.3 Flash?

Which is better, Gemini 1.5 Pro or GLM 5.3 Flash?

How much does Gemini 1.5 Pro cost compared to GLM 5.3 Flash?

How can I compare Gemini 1.5 Pro and GLM 5.3 Flash on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages

Cost per 1M tokens

30 hosts, cheapest first

What we learned reading every model

Common questions

What is the difference between Gemini 1.5 Pro and GLM 5.3 Flash?

Which is better, Gemini 1.5 Pro or GLM 5.3 Flash?

How much does Gemini 1.5 Pro cost compared to GLM 5.3 Flash?

How can I compare Gemini 1.5 Pro and GLM 5.3 Flash on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages