Skip to content
  • Models
  • Rankings
  • Ori
Sign Up
Sign Up
OpenRouterOpenRouter
© 2026 OpenRouter, Inc

Product

  • Chat
  • Rankings
  • Benchmarks
  • Apps
  • Discover
  • Models
  • Collections
  • Providers
  • Pricing
  • Business
  • Enterprise
  • Labs

Company

  • About
  • Blog
  • Careers
    Hiring
  • Privacy
  • Terms of Service
  • Trust Center
  • Support
  • Works With OR
  • Data
  • Brand

Developer

  • Documentation
  • API Reference
  • Developer Platform
  • Status

Connect

  • Discord
  • GitHub
  • LinkedIn
  • X
  • YouTube
  1. Home
  2. /
  3. Compare

GPT-6 Luna vs GLM 5.3 Flash

Compare GPT-6 Luna from OpenAI and GLM 5.3 Flash from Z.ai on key metrics including benchmarks, price, context length, and other model features. Access both models and hundreds of others through the OpenRouter API.

Favicon for openai
GPT-6 Luna
Favicon for z-ai
GLM 5.3 Flash
Favicon for openai
GPT-6 Luna
Favicon for z-ai
GLM 5.3 Flash

Overview

GPT-6 Luna
Author
OpenAI
GLM 5.3 Flash
Author
Z.ai
GPT-6 Luna
Context length
1.05Mtokens
GLM 5.3 Flash
Context length
1.31Mtokens
GPT-6 Luna
Reasoning
GLM 5.3 Flash
Reasoning
GPT-6 Luna
Input modalities
GLM 5.3 Flash
Input modalities
GPT-6 Luna
Output modalities
GLM 5.3 Flash
Output modalities

GPT-6 Luna vs GLM 5.3 Flash: side-by-side summary

GPT-6 Luna and GLM 5.3 Flash are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

GPT-6 Luna, from OpenAI, has a 1,050,000-token context window and is priced at $0.10/M tokens input, $0.50/M tokens output on OpenRouter.

GLM 5.3 Flash, from Z.ai, has a 1,310,720-token context window and is priced at $0.075/M tokens input, $0.25/M tokens output on OpenRouter.

Context window
  • GPT-6 Luna: 1,050,000 tokens
  • GLM 5.3 Flash: 1,310,720 tokens
Price
  • GPT-6 Luna: $0.10/M tokens input, $0.50/M tokens output
  • GLM 5.3 Flash: $0.075/M tokens input, $0.25/M tokens output
Provided by
  • GPT-6 Luna: OpenAI
  • GLM 5.3 Flash: Z.ai
  • model details, providers and pricing
  • model details, providers and pricing
GPT-6 Luna
GLM 5.3 Flash