GLM-5.1 vs Claude Fable 5.1
Compare GLM-5.1 and Claude Fable 5.1 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 Claude Fable 5.1 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.
Anthropic / Claude Fable 5.1
maxDescription
Anthropic's most capable generally available model, sitting above the Opus line. Fable 5.1 is built for long, unsupervised work: multi-day coding, agentic research, and tasks that run across dozens of tool calls. It reads text and images, maintains a very large context, and reasons before every answer at an adjustable depth. Its knowledge is the most recent of any Claude model. Anthropic positions Opus 5 as the starting point for most work, and Fable 5.1 for teams whose evaluations demand a higher ceiling.
About
About
Capabilities
Capabilities
Comparison
Why Use GLM-5.1 and Claude Fable 5.1?
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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.
Anthropic / Claude Fable 5.1
maxLong-Running Coding
Anthropic's strongest model for multi-day coding sessions and codebase research. Built to sustain complex software engineering across many steps and tool calls without a human checking in at each one.
Adaptive Thinking Always On
Reasoning is always on, with adjustable effort rather than an on-off switch. Steer depth up for the hardest problems or down for lighter work, without restructuring the prompt each time.
Room For Whole Projects
A very large context window, among the largest available. Load an entire codebase, a long research corpus, or a large document set and work across all of it in a single session.
Document-Heavy Analysis
Built for document-heavy analysis and multi-step automation alongside coding. Suited to work that reads across large, mixed source material and produces structured, reviewable output.
Long-Horizon Agent Work
Its defining strength. Retains context, uses tools, evaluates results, and works on a task through many steps. Built for agents who run for a long time with little supervision.
Text And Image Input
Reads text and images in the same prompt, so you can send screenshots, diagrams, or scanned pages alongside your question. Output is text only. Audio and video are not accepted.
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