GLM-5.3-Flash vs GPT-6 Luna: Pricing and Specs
GLM-5.3-Flash $0.15 / $0.50 vs GPT-6 Luna $0.10 / $0.50 per 1M tokens in / out.
| GLM-5.3-Flash | GPT-6 Luna | |
|---|---|---|
| Maker | Z.ai | OpenAI |
| Input, per 1M tokens | $0.15 | $0.10 |
| Output, per 1M tokens | $0.50 | $0.50 |
| Context window | 1M tokens z.ai | 1,050,000 tokens openai.com |
| Max output | 128K tokens z.ai | 128,000 tokens openai.com |
| Input types | Video, Image, Text, File z.ai | Text, Image openai.com |
| Output types | Text z.ai | Text openai.com |
| Released | Not published in the docs we read | Sep 22, 2026 openai.com |
| Price checked | Nov 9, 2026 z.ai | Nov 9, 2026 openai.com |
| Tracked changes | 0 | 0 |
Facts side by side from each maker's own pages. No score and no verdict.
Get an email when GLM-5.3-Flash or GPT-6 Luna changes its price
Questions
Which is cheaper, GLM-5.3-Flash or GPT-6 Luna
By listed price, GPT-6 Luna is lower: $0.10 vs $0.15 per 1M input tokens. Price is the only thing this answer compares.
What do 1M input and 1M output tokens cost on each
GLM-5.3-Flash: $0.65. GPT-6 Luna: $0.60. Listed standard prices, before caching or batch discounts.
What context window does each have
GLM-5.3-Flash: 1M tokens. GPT-6 Luna: 1,050,000 tokens. From each maker's docs.
Who makes GLM-5.3-Flash and GPT-6 Luna
GLM-5.3-Flash is made by Z.ai. GPT-6 Luna is made by OpenAI.