GPT 5.5 Pro vs GLM 5.2
OpenAI's high-capability model optimized for deep reasoning and accuracy on complex, high-stakes workloads.
Z.ai's frontier reasoning model for long-context agents and software engineering.
No captured outputs for these models yet.
Frequently Asked Questions: GPT 5.5 Pro vs GLM 5.2▼
Which is better, GPT 5.5 Pro or GLM 5.2?
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Based on the Capability Index, GPT 5.5 Pro scores higher (91.8 vs 83.4). However, "better" depends on your use case — pricing, speed, context window, and specific capability needs all matter.
Which is cheaper, GPT 5.5 Pro or GLM 5.2?
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GLM 5.2 has a lower blended cost. GPT 5.5 Pro: $30.00 input / $180.00 output. GLM 5.2: $1.40 input / $4.40 output.
Which has a larger context window, GPT 5.5 Pro or GLM 5.2?
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GPT 5.5 Pro has a larger context window: GPT 5.5 Pro supports 1.1M tokens vs GLM 5.2 at 262K tokens.
Do both GPT 5.5 Pro and GLM 5.2 support vision?
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GPT 5.5 Pro supports vision/image input, but GLM 5.2 does not.
What are the key differences between GPT 5.5 Pro and GLM 5.2?
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Key differences: GPT 5.5 Pro has a notably higher capability index (8.4 point gap); GLM 5.2 is significantly cheaper; only GPT 5.5 Pro supports vision input. Compare full specs on this page.
Which model should I choose for my use case?
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If cost is your priority, choose the cheaper option. If you need the highest intelligence for complex tasks, pick the higher-scoring model. For long documents or codebases, choose the larger context window. You can try both GPT 5.5 Pro and GLM 5.2 for free on idapt.app to see which performs better for your specific needs.