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  5. GLM 5.3 FlashXvso3 Mini
Updated Sep 2026

GLM 5.3 FlashXvso3 Mini

GLM 5.3 FlashX is cheaper than o3 Mini at $0.37/M vs $1.1/M input tokens.

GLM 5.3 FlashX and o3 Mini compared across 12 shared prompts
SpecGLM 5.3 FlashXo3 Mini
Input price$0.37/M tokens$1.1/M tokens
Output price$1.25/M tokens$4.4/M tokens
Context window1.0M tokens64K tokens
Weights—Closed
Free API (OpenRouter)NoNo
ReleasedSep 2026Dec 2024
Our Verdict
GLM 5.3 FlashX
GLM 5.3 FlashX
o3 Mini
o3 MiniRunner-up

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

GLM 5.3 FlashX costs 3.5x less per token.

Slight edge
API pricing

Cost per 1M tokens

GLM 5.3 FlashX
Input
$0.37
3.0× cheaper
Output
$1.25
3.5× cheaper
o3 Mini
Input
$1.10
Output
$4.40

GLM 5.3 FlashX is cheaper on both: 3.0× input, 3.5× output.

Where to run it

2 hosts

GLM 5.3 FlashX1 host
HostInOutContextUptime
Z.aifp8$0.37 in·$1.25 out·1M·100% up
o3 Mini1 host
HostInOutContextUptime
OpenAI$1.10 in·$4.40 out·200k·100% up

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

Research

What we learned reading every model

FAQ

Common questions

GLM 5.3 FlashX is developed by Zhipu AI while o3 Mini is developed by OpenAI. GLM 5.3 FlashX has a 1.0M token context window vs o3 Mini's 64K. You can compare their actual outputs across 12 challenges on Rival to see how they differ in practice.

It depends on your use case. GLM 5.3 FlashX and o3 Mini each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 12 challenges so you can judge which fits your needs best.

GLM 5.3 FlashX costs $0.37/M input tokens and o3 Mini costs $1.1/M input tokens. GLM 5.3 FlashX is $0.73/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 GLM 5.3 FlashX 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.

Keep exploring

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Same lab, same size, long tail

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Model pages

GLM 5.3 FlashX logo
GLM 5.3 FlashX12 outputs, specs and price
o3 Mini logo
o3 Mini59 outputs, specs and price
Rival
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