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Comparison · AI Models & LLMs

GLM-5.3 vs GPT-6 Luna

The same method as our rankings: scores from the engine, sourced data, verified prices.

Details: GLM-5.3 →Details: GPT-6 Luna →

Z.ai GLM-5.3 — drawn card, not a photograph of the product

GLM-5.3

Z.ai

Full sheet →
Context window
1M tokens
Maximum output
128k tokens
Input cost per 1M tokens
$1.40
Output cost per 1M tokens
$4.40
OpenAI gpt-6-luna — drawn card, not a photograph of the product

GPT-6 Luna

OpenAI

Full sheet →
Context window
1.05M tokens
Maximum output
128k tokens
Input cost per 1M tokens
$0.10
Output cost per 1M tokens
$0.50

The numbers side by side

Each bar is the product's verified figure; on every row the longer bar is the higher of the two values.

  • Context windowhigher is better
    GLM-5.31M tokens
    GPT-6 Luna1.05M tokens
  • Maximum outputhigher is better
    GLM-5.3128k tokens
    GPT-6 Luna128k tokens
  • Input cost per 1M tokenslower is better
    GLM-5.3$1.40
    GPT-6 Luna$0.10
  • Cached input cost per 1M tokenslower is better
    GLM-5.3$0.26
    GPT-6 Luna$0.01
  • Output cost per 1M tokenslower is better
    GLM-5.3$4.40
    GPT-6 Luna$0.50

Who wins where

  • For long documentsGPT-6 LunaContext window
  • Cheaper to readGPT-6 LunaInput cost per 1M tokens
  • Cheaper to writeGPT-6 LunaOutput cost per 1M tokens

GPT-6 Luna: reads images · GPT-6 Luna: calls tools and functions · GLM-5.3: open weights (downloadable)

Data sheet side by side

Memory and answer length

Context window1M tokens✓1.05M tokens5% more
Maximum output128k tokens128k tokens

API prices

Input cost per 1M tokens$1.40✓$0.1093% less
Cached input cost per 1M tokens$0.26✓$0.0196% less
Output cost per 1M tokens$4.40✓$0.5089% less

Knowledge and abilities

Knowledge cutoffNot statedMay 2026
Reads imagesNot statedYes
Calls tools and functionsNot statedYes

Size and openness

Parameters753 billionNot stated
Open weights (downloadable)YesNot stated

What a month costs

Change the volumes: the cost is worked out from the verified list prices above.

GLM-5.3$5.00per month · $60.00 per year
GPT-6 Luna$0.45per month · $5.40 per yearThe cheaper one — you save $4.55 per month

The scenarios are only starting points to edit, not data about your use. List prices without discounts, time-of-day rates or taxes.

Questions and answers

For long documents: GLM-5.3 or GPT-6 Luna?

GPT-6 Luna: 1.05M tokens against 1M tokens (Context window).

Cheaper to read: GLM-5.3 or GPT-6 Luna?

GPT-6 Luna: $0.10 against $1.40 (Input cost per 1M tokens).

Cheaper to write: GLM-5.3 or GPT-6 Luna?

GPT-6 Luna: $0.50 against $4.40 (Output cost per 1M tokens).

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