GLM-5.3 Flash vs GPT-5.6 Luna: Specs & Benchmark Comparison
| Characteristic | GLM-5.3 Flash | GPT-5.6 Luna |
|---|---|---|
| Company | Zhipu AI | OpenAI |
| Release Date | August 26, 2026 | July 9, 2026 |
| Parameters | 320B | — |
| Multimodal | Yes | Yes |
| Context (input) | 1.0M | 1.1M |
| Context (output) | 131K | 128K |
| Input Price / 1M | $0.15 | $0.20 |
| Output Price / 1M | $0.50 | $1.20 |
| Average Score | 0.6 | 0.5 |
| Benchmarks | ||
| AutomationBench v1.0.6 | 0.5 | 0.1 |
| Toolathlon Verified | 0.8 | 0.5 |
| Agents' Last Exam | 0.3 | 0.5 |
| DeepSWE 1.1 | 0.6 | 0.7 |
| Terminal-Bench 2.1 | 0.8 | 0.8 |
Visual Benchmark Comparison
GLM-5.3 Flash
GPT-5.6 Luna
AutomationBench v1.0.60.5 vs 0.1
0.5
0.1
Toolathlon Verified0.8 vs 0.5
0.8
0.5
Agents' Last Exam0.3 vs 0.5
0.3
0.5
DeepSWE 1.10.6 vs 0.7
0.6
0.7
Terminal-Bench 2.10.8 vs 0.8
0.8
0.8
Verdict
GLM-5.3 Flash leads in 2 out of 4 comparison categories.
Overall Performance
Both models show comparable average scores: GLM-5.3 Flash — 0.6, GPT-5.6 Luna — 0.5.
API Cost
GLM-5.3 Flash is 2.2x cheaper: input $0.15/1M vs $0.20/1M tokens.
Context Window
GPT-5.6 Luna supports a larger context: 1M vs 1M tokens.
Recency
GLM-5.3 Flash is newer: released 8/26/2026 vs 7/9/2026.
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Frequently Asked Questions
Which is better for coding — GLM-5.3 Flash or GPT-5.6 Luna?
Direct comparison on the SWE-Bench benchmark is not available. We recommend reviewing other metrics on the comparison page.
Which model is cheaper — GLM-5.3 Flash or GPT-5.6 Luna?
GLM-5.3 Flash is cheaper for input: $0.15 per 1M tokens vs $0.20.
Which has a larger context window — GLM-5.3 Flash or GPT-5.6 Luna?
GPT-5.6 Luna supports a larger context: 1,050,000 tokens vs 1,048,576.
The GLM-5.3 Flash and GPT-5.6 Luna comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the GLM-5.3 Flash or GPT-5.6 Luna page. See also the complete list of AI model comparisons.