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  5. GLM 5.3 FlashXvsGPT-5.1-Codex-Mini
Updated Sep 2026

GLM 5.3 FlashXvsGPT-5.1-Codex-Mini

GLM 5.3 FlashX is cheaper than GPT-5.1-Codex-Mini at $0.37/M vs $1.5/M input tokens.

GLM 5.3 FlashX and GPT-5.1-Codex-Mini compared across 12 shared prompts
SpecGLM 5.3 FlashXGPT-5.1-Codex-Mini
Input price$0.37/M tokens$1.5/M tokens
Output price$1.25/M tokens$6/M tokens
Context window1.0M tokens400K tokens
Weights—Closed
Free API (OpenRouter)NoNo
ReleasedSep 2026Nov 2025
Side by side

Same prompt, both answers

Opening lines from 2 of the 12 prompts both answered. Formatting stripped, words untouched.

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…

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
GPT-5.1-Codex-Mini577 words
1-Month Beginner Plan for Better Health & Longevity Focus areas: Nutrition, Movement, and Sleep & Stress Balance. Each week builds a little habit-building momentum. Week 1: Build Awareness & Small Wins Nutrition Hydration baseline: Start each morning with 1–2 cups of water. Carry a bottle.
Read the full answer

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…

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…
Read the full answer
GPT-5.1-Codex-Mini182 words
Honey-Garlic Chickpea Sizzle Bowls Prep + Cook Time: ~25 minutes Ingredients (7 pantry staples): 1 can chickpeas, drained and rinsed 1 cup rice (white or brown) 2 tbsp olive oil 3 garlic cloves, minced (or 1 tsp garlic powder if canned) 2 tbsp honey 2 tbsp soy sauce 1/2 tsp chili flakes (adjust to your heat preference)…
Read the full answer
Our Verdict
GLM 5.3 FlashX
GLM 5.3 FlashX
GPT-5.1-Codex-Mini
GPT-5.1-Codex-Mini

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

GLM 5.3 FlashX costs 4.8x less per token.

Too close to call
API pricing

Cost per 1M tokens

GLM 5.3 FlashX
Input
$0.37
4.1× cheaper
Output
$1.25
4.8× cheaper
GPT-5.1-Codex-Mini
Input
$1.50
Output
$6.00

GLM 5.3 FlashX is cheaper on both: 4.1× input, 4.8× output.

Where to run it

2 hosts

GLM 5.3 FlashX1 host
HostInOutContextUptime
Z.aifp8$0.37 in·$1.25 out·1M·100% up
GPT-5.1-Codex-Mini1 host
HostInOutContextUptime
Azure AI Foundry$0.25 in·$2.00 out·400k·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 GPT-5.1-Codex-Mini is developed by OpenAI. GLM 5.3 FlashX has a 1.0M token context window vs GPT-5.1-Codex-Mini's 400K. 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 GPT-5.1-Codex-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 GPT-5.1-Codex-Mini costs $1.5/M input tokens. GLM 5.3 FlashX is $1.13/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 GPT-5.1-Codex-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

More comparisons

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GPT-5.1-Codex-Mini vs Ternary Bonsai 2 27BLanded Sep 2026

Same lab, same size, long tail

GLM 5.3 FlashX logoGLM 5.3 Flash logo
GLM 5.3 FlashX vs GLM 5.3 FlashSame lab
GLM 5.3 FlashX logoGLM 5.2 logo
GLM 5.3 FlashX vs GLM 5.2Same lab
GPT-5.1-Codex-Mini logoGPT-6 Astra Pro logo
GPT-5.1-Codex-Mini vs GPT-6 Astra ProSame lab
GPT-5.1-Codex-Mini logoGPT-6 Astra logo
GPT-5.1-Codex-Mini vs GPT-6 AstraSame lab
GPT-5.1-Codex-Mini logoQwen3.8 Max (0902) logo
GPT-5.1-Codex-Mini vs Qwen3.8 Max (0902)New provider
GLM 5.3 FlashX logoQwQ 32B logo
GLM 5.3 FlashX vs QwQ 32BSame size
GLM 5.3 FlashX logoRing 2.6 1T logo
GLM 5.3 FlashX vs Ring 2.6 1TNew provider
GLM 5.3 FlashX logoSeed 2.0 Code logo
GLM 5.3 FlashX vs Seed 2.0 CodeSame size

Model pages

GLM 5.3 FlashX logo
GLM 5.3 FlashX12 outputs, specs and price
GPT-5.1-Codex-Mini logo
GPT-5.1-Codex-Mini59 outputs, specs and price
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