head-to-head
OpenAI: GPT-6 Luna Pro vs Z.ai: GLM Flash Latest
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-10-04.
| OpenAI: GPT-6 Luna Pro | Z.ai: GLM Flash Latest | |
|---|---|---|
| Vendor | openai | ~z-ai |
| Quality Score | 100 | 100 |
| Input Price | $0.10/M | $0.03/M |
| Output Price | $0.50/M | $0.50/M |
| Context Window | 1,050,000 | 1,048,576 |
| Max Output | 128,000 | 131,072 |
| Tool Calling | ✓ | ✓ |
| Structured Output | ✓ | ✓ |
| Reasoning Mode | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio | - | - |
The verdict
For a sample job of 1 million input tokens and 250,000 output tokens, GLM Flash Latest costs $0.16 and GPT-6 Luna Pro costs $0.23, so GLM Flash Latest is about 1.4 times cheaper for the same work.
Both take in a similar amount of text: 1,050,000 and 1,048,576 tokens, about 1,575 and 1,573 pages.
Only GLM Flash Latest offers video input.
GPT-6 Luna Pro was released in September 2026 and GLM Flash Latest in August 2026.
Pick GLM Flash Latest if you need lower cost or video input.
Costs use current list prices per million tokens; page counts assume about 0.75 words per token and 500 words per page.
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