Z.ai: GLM 5.3
Analysis Summary
Z.ai GLM 5.3 is a high-capability general model with measured reasoning, coding, and agentic performance. Its 1.31M token context window, tool use, and function calling support large codebases, lengthy client documents, and multi-step workflows without aggressive context reduction.
For Design for Online, it is a strong candidate for software engineering, research agents, technical SEO, and high-stakes content where instruction adherence matters. The broad context and structured tool support also make it useful for consolidating document analysis and action planning in one workflow. Listed pricing of $1.40 per million input tokens and $4.40 per million output tokens is premium, so routine traffic should be routed to a cheaper model. Adopt it when reasoning depth and agent reliability justify the cost.
Assessed September 7, 2026
Editorial notes
GLM 5.3 combines excellent reasoning and coding with strong agentic capability, a 1.31M context window, and tool calling. Premium pricing makes it better suited to complex client work than bulk automation.
Rankings consider pricing, capabilities, benchmarks, and real-world applicability and are refreshed as new models launch. Feedback?
DFO Verdict
GLM 5.3 combines excellent reasoning and coding with strong agentic capability, a 1.31M context window, and tool calling. Premium pricing makes it better suited to complex client work than bulk automation.
How Z.ai: GLM 5.3 compares
Z.ai: GLM 5.3 ranks #20 of 438 AI models we track for overall intelligence, #15 of 210 for coding, #12 of 192 for agentic tasks. Its 1.3M-token context window is larger than 99% of the models we list. At $0.91 per million input tokens it is cheaper than 28% of comparable models.
Dark bar = input · light bar = output, scaled to the priciest peer.
1M tokens ≈ 8 full-length novels or ~2,500 pages of business documents in a single request.
Strongest on business fit. The pulled-in intelligence corner is the trade-off, and if the shape matters more than the price, this is your model.
Compare shapes side-by-side →Pricing
| Token Type | Cost per 1M tokens | Cost per 1K tokens |
|---|---|---|
| Input | $0.91 | $0.000910 |
| Output | $2.86 | $0.002860 |
What would Z.ai: GLM 5.3 cost your business?
Pick the job that looks most like yours, then fine-tune with the sliders. Estimates update live.
A website chatbot handling around 100 customer conversations a day, a few short messages each.
Full calculator with 779 models → Price Calculator
These numbers get smaller with the right architecture.
We route routine calls to cheap models and save Z.ai: GLM 5.3 for the hard ones. Most clients cut their estimate by 60-80%.
Talk to our teamAbout Z.ai: GLM 5.3
GLM-5.3 is a large-scale reasoning model from Z.ai, built for complex software engineering and long-horizon agent tasks. It supports text input and output with a 1M-token context window, and improves..
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Frequently asked questions about Z.ai: GLM 5.3
How much does Z.ai: GLM 5.3 cost?
Z.ai: GLM 5.3 costs $0.91 per million input tokens and $2.86 per million output tokens.
What is the context window of Z.ai: GLM 5.3?
Z.ai: GLM 5.3 has a context window of 1,310,720 tokens (1.3M).
Is Z.ai: GLM 5.3 good for coding?
On our coding benchmark index, Z.ai: GLM 5.3 ranks #15 of 210 models, placing it in the top quartile of the field for code generation and debugging.
What can Z.ai: GLM 5.3 do?
Z.ai: GLM 5.3 supports tool use and function calling.
Who created Z.ai: GLM 5.3?
Z.ai: GLM 5.3 is developed by Z.ai and was released on August 18, 2026.