GLM-5.3 vs GPT-5.2: Specs & Benchmark Comparison
GLM-5.3 is developed by Zhipu AI, while GPT-5.2 comes from OpenAI. GPT-5.2 was released in December 2025, and GLM-5.3 followed 8 months later in August 2026. GLM-5.3 has a published size of about 753 billion parameters; OpenAI has not disclosed the parameter count of GPT-5.2.
The two models share 2 published benchmarks. GLM-5.3 leads on 2 of them. The widest gaps are on Humanity's Last Exam, where GLM-5.3 scores 62.5% against 34.5%; Toolathlon, where GLM-5.3 scores 73.0% against 46.3%. Averaged across everything we track, GLM-5.3 sits at 52.2% and GPT-5.2 at 78.2%.
On price the two are close: GLM-5.3 costs $1.40 per million input tokens and $4.40 per million output tokens, GPT-5.2 $1.50 and $6. GLM-5.3 takes the larger context window at 1M tokens, compared with 256K for GPT-5.2. GLM-5.3 accepts text as input, while GPT-5.2 accepts text, images, audio, and video.
| Characteristic | GLM-5.3 | GPT-5.2 |
|---|---|---|
| Company | Zhipu AI | OpenAI |
| Release Date | August 14, 2026 | December 10, 2025 |
| Parameters | 753B | — |
| Multimodal | No | Yes |
| Context (input) | 1.0M | 256K |
| Context (output) | 131K | 128K |
| Input Price / 1M | $1.40 | $1.50 |
| Output Price / 1M | $4.40 | $6.00 |
| Average Score | 52.2% | 78.2% |
| Benchmarks | ||
| Humanity's Last Exam | 62.5% | 34.5% |
| Toolathlon | 73.0% | 46.3% |
Visual Benchmark Comparison
Verdict
GLM-5.3 leads in 3 out of 4 comparison categories.
Both models show comparable average scores: GLM-5.3 — 0.5, GPT-5.2 — 0.8.
GLM-5.3 is 1.3x cheaper: input $1.40/1M vs $1.50/1M tokens.
GLM-5.3 supports a larger context: 1M vs 256K tokens.
GLM-5.3 is newer: released 8/14/2026 vs 12/10/2025.
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Frequently Asked Questions
Which is better for coding — GLM-5.3 or GPT-5.2?
Which model is cheaper — GLM-5.3 or GPT-5.2?
Which has a larger context window — GLM-5.3 or GPT-5.2?
The GLM-5.3 and GPT-5.2 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 or GPT-5.2 page. See also the complete list of AI model comparisons.