GLM-5.2 vs GPT-5.6 Luna: Specs & Benchmark Comparison
GLM-5.2 is developed by Zhipu AI, while GPT-5.6 Luna comes from OpenAI. GLM-5.2 was released in June 2026, and GPT-5.6 Luna followed a month later in July 2026. GLM-5.2 has a published size of about 753 billion parameters; OpenAI has not disclosed the parameter count of GPT-5.6 Luna.
The two models share 7 published benchmarks. GPT-5.6 Luna leads on 7 of them. The widest gaps are on DeepSWE 1.1, where GPT-5.6 Luna scores 67.0% against 44.0%; DeepSWE, where GPT-5.6 Luna scores 67.2% against 46.2%. Averaged across everything we track, GLM-5.2 sits at 60.9% and GPT-5.6 Luna at 51.5%.
GPT-5.6 Luna is the cheaper API at $0.20 per million input tokens and $1.20 per million output tokens, roughly 7 times cheaper than GLM-5.2 at $1.40 and $4.40. Both accept a context window of about 1M tokens. GLM-5.2 accepts text as input, while GPT-5.6 Luna accepts text and images.
| Characteristic | GLM-5.2 | GPT-5.6 Luna |
|---|---|---|
| Company | Zhipu AI | OpenAI |
| Release Date | June 16, 2026 | July 9, 2026 |
| Parameters | 753B | — |
| Multimodal | No | Yes |
| Context (input) | 1.0M | 1.1M |
| Context (output) | 131K | 128K |
| Input Price / 1M | $1.40 | $0.20 |
| Output Price / 1M | $4.40 | $1.20 |
| Average Score | 60.9% | 51.5% |
| Benchmarks | ||
| DeepSWE 1.1 | 44.0% | 67.0% |
| DeepSWE | 46.2% | 67.2% |
| FrontierCode 1.1 | 24.5% | 39.8% |
| Toolathlon | 48.2% | 53.4% |
| Terminal-Bench 2.1 | 82.7% | 84.7% |
| GPQA | 91.0% | 92.3% |
| SWE-Bench Pro | 62.1% | 62.7% |
Visual Benchmark Comparison
Verdict
GPT-5.6 Luna leads in 3 out of 4 comparison categories.
Both models show comparable average scores: GLM-5.2 — 0.6, GPT-5.6 Luna — 0.5.
GPT-5.6 Luna is 4.1x cheaper: input $0.20/1M vs $1.40/1M tokens.
GPT-5.6 Luna supports a larger context: 1M vs 1M tokens.
GPT-5.6 Luna is newer: released 7/9/2026 vs 6/16/2026.
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Frequently Asked Questions
Which is better for coding — GLM-5.2 or GPT-5.6 Luna?
Which model is cheaper — GLM-5.2 or GPT-5.6 Luna?
Which has a larger context window — GLM-5.2 or GPT-5.6 Luna?
The GLM-5.2 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-5.2 or GPT-5.6 Luna page. See also the complete list of AI model comparisons.