GLM-5.2 vs Claude Fable 5.2
Compare GLM-5.2 and Claude Fable 5.2 side-by-side. See comparisons of price, response speed, accuracy, and file support to choose the best model for your task.
Overview
GLM-5.2 vs Claude Fable 5.2 Overview
Everything you need to know about these AI models, including capabilities, performance, pricing, and technical details.
Z AI / GLM-5.2
proDescription
A Z.ai coding model designed for agents that stay on a single task for a long time. GLM-5.2 holds a very large context that Z.ai describes as lossless, so an entire codebase fits into a single reasoning session. Trained specifically for long-horizon coding agents. Text only, with no image input. Open weights under an MIT license, so it can be self-hosted.
Anthropic / Claude Fable 5.2
maxDescription
Anthropic's most capable model and the upgrade to Fable 5.1. Anthropic reports it is a step above Opus 5.5 in almost every area it tested, with large gains in coding and chart reading, and output up to 30% faster than Fable 5.1. It reads text, images, and files across a very large context, supports web search, and offers effort from Low to Max.
About
About
Capabilities
Capabilities
Comparison
Why Use GLM-5.2 and Claude Fable 5.2?
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Z AI / GLM-5.2
proRepository-Scale Engineering
Z.ai trained it for months on long-horizon coding scenarios, including large-scale implementation and performance optimisation. Developers report stronger production standards and better client-side and mobile work, including on-device debugging.
Effort Set Per Task
Two thinking effort levels, high and max. Z.ai explicitly recommends max effort for coding work, trading throughput for depth on the tasks where getting it right matters most.
Lossless Full-Scale Context
Z.ai's framing is that the point is not having a large window but making one usable. It reports stable performance across the full window rather than degradation at the far end.
Large Outputs At Once
Produces very large single responses, enough to generate or refactor big files without breaking the job into chunks and reassembling the results by hand.
Automated Research And Audits
Z.ai lists automated research among the tasks it was trained for. It can read a whole project and return an architecture map, module responsibilities, API contracts, data flows, and technical debt.
Text Only Input
Text only. No image, audio, or video input. Screenshots, diagrams, mockups, and scanned pages are outside this model's reading range, which rules them out for visual work.
Anthropic / Claude Fable 5.2
maxTop FrontierCode Score
Anthropic reports 49.1% on FrontierCode 2.0 at Xhigh effort, up from 32.4% for Fable 5.1. That is the highest score of any released model Anthropic tested.
Effort Low To Max
Effort runs Low, Medium, High, Xhigh, and Max, with Medium as the default. At Medium, Anthropic reports it finishes hard tasks with fewer tokens than Fable 5.1.
Room For Whole Projects
A very large context window on Aymo, with room for a full codebase or a long document set. Load everything once and work across it in one session.
Expert Technical Work
Anthropic built Fable for its most ambitious, open-ended technical work. It can also act as an advisor to smaller models or hand simpler tasks to them.
Fewer Needless Refusals
Supports web search on Aymo. Anthropic reports about 55% fewer blocked legitimate requests than Fable 5.1, with similar protection against cyber and biology risks.
Text, Image, And Files
Reads text and images, plus files you upload on Aymo. On Chartography, a chart-reading test without tools, Anthropic reports 73.4%, up from 44.8% for Fable 5.1.
Why Aymo
Why chat with GLM-5.2 and Claude Fable 5.2 on Aymo AI?
Aymo gives you more than access to GLM-5.2 and Claude Fable 5.2—it provides a complete multi-model AI workspace designed for productivity.
Compare Responses
See how GLM-5.2 and Claude Fable 5.2 performs alongside Claude, Gemini, Grok, and other leading AI models.
One Workspace
Keep all your AI conversations, files, and prompts in a single organized workspace.
Switch Models Instantly
Move between different AI models without restarting your conversation.
Upload Once
Use the same files across multiple AI models without uploading them again.
Save & Organize
Bookmark important chats, organize projects, and return anytime.
Work Together
Share conversations and collaborate with teammates in one place.