GLM 5.3
PremiumZ.ai's large-scale reasoning flagship for complex software engineering and long-horizon agent tasks.
1M-token context with text input and output, improving on GLM 5.2's coding and its balance of performance and token efficiency. Reasoning is always on with low, high, and max effort; max is the default.
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GLM 5.3 is competitively priced at $1.40/M tokens input and $4.40/M tokens output. Cached input reads are priced at $0.26/M tokens, making repeated context cheaper. The model supports extended reasoning, a 1M context window.
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Nemotron 3 Ultravs GLM 5.3Frequently Asked Questions about GLM 5.3▼
When was GLM 5.3 released?
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GLM 5.3 was released on August 18, 2026.
Who created GLM 5.3?
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GLM 5.3 was created by Zhipu AI.
How much does GLM 5.3 cost?
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GLM 5.3 costs $1.40/M input tokens and $4.40/M output tokens.
What is GLM 5.3 API pricing?
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The GLM 5.3 API is priced at $1.40 per million input tokens and $4.40 per million output tokens. You can access GLM 5.3 through idapt.app alongside 200+ other AI models in one workspace.
Is GLM 5.3 a reasoning model?
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Yes, GLM 5.3 is a reasoning model. It can think step-by-step through complex problems before providing an answer, often yielding better results on difficult tasks like math, coding, and multi-step logic.
Does GLM 5.3 support image or vision input?
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No, GLM 5.3 does not currently support image or vision input. It is a text-only model.
Does GLM 5.3 support audio?
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No, GLM 5.3 does not support audio input.
What is the context window of GLM 5.3?
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GLM 5.3 has a context window of 1M tokens, meaning it can process approximately 786,432 words of context at once.
Is GLM 5.3 open source?
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GLM 5.3 is a proprietary model developed by Zhipu AI. The model weights and training data are not publicly available.
Where can I use GLM 5.3?
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You can chat with GLM 5.3 on idapt.app — no separate API key required. idapt is an AI workspace with 200+ models, agents, computers, and tasks. You can also access GLM 5.3 through Zhipu AI's own API or platform.