What is the difference between GLM 5.3 Flash and o3 Mini?

GLM 5.3 Flash is developed by Zhipu AI while o3 Mini is developed by OpenAI. GLM 5.3 Flash has a 1.3M token context window vs o3 Mini's 64K. You can compare their actual outputs across 15 challenges on Rival to see how they differ in practice.

Which is better, GLM 5.3 Flash or o3 Mini?

It depends on your use case. GLM 5.3 Flash and o3 Mini each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 15 challenges so you can judge which fits your needs best.

How much does GLM 5.3 Flash cost compared to o3 Mini?

GLM 5.3 Flash costs $0.15/M input tokens and o3 Mini costs $1.1/M input tokens. GLM 5.3 Flash is $0.95/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 GLM 5.3 Flash and o3 Mini on Rival?

This page shows a side-by-side comparison of GLM 5.3 Flash and o3 Mini 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

GLM 5.3 Flashvso3 Mini

GLM 5.3 Flash is cheaper than o3 Mini at $0.15/M vs $1.1/M input tokens.

GLM 5.3 Flash and o3 Mini compared across 15 shared prompts
Spec	GLM 5.3 Flash	o3 Mini
Input price	$0.15/M tokens	$1.1/M tokens
Output price	$0.5/M tokens	$4.4/M tokens
Context window	1.3M tokens	64K tokens
Weights	Open	Closed
Free API (OpenRouter)	No	No
Released	Aug 2026	Dec 2024

Our Verdict

GLM 5.3 Flash

o3 MiniRunner-up

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

GLM 5.3 Flash costs 8.8x less per token.

Slight edge

API pricing

Cost per 1M tokens

GLM 5.3 Flash

Input

$0.15

7.3× cheaper

Output

$0.50

8.8× cheaper

o3 Mini

Input

$1.10

Output

$4.40

GLM 5.3 Flash is cheaper on both: 7.3× input, 8.8× output.

Where to run it

31 hosts, cheapest first

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

o3 Mini1 host

HostInOutContextUptime

OpenAI$1.10 in$4.40 out200k100% up

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

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

Cost per 1M tokens

31 hosts, cheapest first

What we learned reading every model

Common questions

What is the difference between GLM 5.3 Flash and o3 Mini?

Which is better, GLM 5.3 Flash or o3 Mini?

How much does GLM 5.3 Flash cost compared to o3 Mini?

How can I compare GLM 5.3 Flash and o3 Mini on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages

Cost per 1M tokens

31 hosts, cheapest first

What we learned reading every model

Common questions

What is the difference between GLM 5.3 Flash and o3 Mini?

Which is better, GLM 5.3 Flash or o3 Mini?

How much does GLM 5.3 Flash cost compared to o3 Mini?

How can I compare GLM 5.3 Flash and o3 Mini on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages