GLM-5.1 vs GPT-5 Nano
Compare GLM-5.1 and GPT-5 Nano side-by-side. See comparisons of price, response speed, accuracy, and file support to choose the best model for your task.
Overview
GLM-5.1 vs GPT-5 Nano Overview
Everything you need to know about these AI models, including capabilities, performance, pricing, and technical details.
Z AI / GLM-5.1
proDescription
Z.ai's flagship for agentic engineering, built to keep working rather than answer quickly. Z.ai says GLM-5.1 can run autonomously on a single task for up to eight hours, planning, executing, and revising as it goes. Strong on coding, office documents, and creative writing. Text only, with no image input, and a context window smaller than the largest frontier models. Open weights under an MIT licence.
OpenAI / GPT-5 Nano
lightDescription
OpenAI's smallest and cheapest GPT-5 model, built for speed above all. GPT-5 Nano is made for summarisation, classification, and other well-defined tasks that run at high volume. It reads text and images, with adjustable reasoning effort. Reasoning depth is shallow by design and its knowledge is dated. The trade is cost: it is among the cheapest models in the catalog.
About
About
Capabilities
Capabilities
Comparison
Why Use GLM-5.1 and GPT-5 Nano?
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Z AI / GLM-5.1
proCoding For Hours
Z.ai optimised it for agentic coding, with long-horizon planning, stepwise execution, and course correction mid-task. Suited to real engineering work with several stages and strong dependencies, rather than isolated snippets.
Thinking On Off
Reasoning is enabled by default and can be switched off entirely. Z.ai describes stronger instruction following, richer multi-turn responses, and better long-context understanding than the previous generation.
Mid-Size Context Window
A mid-size context window. Comfortable for long reports, contracts, and codebases, though a fraction of the capacity of the largest frontier models, so very big corpora need splitting.
Documents And Fiction
Z.ai highlights improvements across PowerPoint, Word, PDF, and Excel tasks, with better layout, plus stronger literary expression, plot development, and style control for fiction and copywriting.
Open-Ended Instructions
Z.ai reports stronger performance on open-ended questions, complex instruction-following, and multi-turn interactions, with more complete answers. Well-suited to everyday assistance and multi-stage information work.
Text Only Input
Z.ai's documentation lists GLM-5.1 as text-in, text-out. It does not accept images, audio, or video. Screenshots, diagrams, and scanned pages are outside what it can read.
OpenAI / GPT-5 Nano
lightCoding Sub-Tasks
Suited to small, well-scoped coding jobs and to acting as a fast sub-agent inside a larger system, rather than tackling whole problems. Reasoning depth is limited, so keep the scope tight.
Adjustable Reasoning Effort
Reasoning effort runs from minimal through low, medium, and high. Even at higher effort it is a shallow reasoner by design, so it suits speed-sensitive work rather than hard multi-step problems.
Room For Long Documents
A large context window, enough to summarise long reports or classify big batches of text in a single pass without splitting the input into separate requests.
Summarisation And Classification
OpenAI names summarisation and classification as its core uses. Built to process high volumes of text quickly and cheaply rather than to produce polished long-form writing.
Analysis On Older Knowledge
Its training data is dated by current standards, so it is fine for processing text you supply but weaker on recent events, which need live sources rather than the model's own knowledge.
Text And Image Input
Reads text and images, so you can send screenshots or scanned pages alongside your prompt. Output is text only. OpenAI states audio and video are not supported.
Why Aymo
Why chat with GLM-5.1 and GPT-5 Nano on Aymo AI?
Aymo gives you more than access to GLM-5.1 and GPT-5 Nano—it provides a complete multi-model AI workspace designed for productivity.
Compare Responses
See how GLM-5.1 and GPT-5 Nano performs alongside Claude, Gemini, Grok, and other leading AI models.
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