GPT-5.5 vs Claude Fable 5.2
Compare GPT-5.5 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
GPT-5.5 vs Claude Fable 5.2 Overview
Everything you need to know about these AI models, including capabilities, performance, pricing, and technical details.
OpenAI / GPT-5.5
maxDescription
OpenAI's frontier model is built for complex professional work. GPT-5.5 takes on demanding coding, deep reasoning, and analysis across very large inputs. It reads text and images, searches the web for current information, and lets you dial its reasoning effort up or down depending on how hard the problem is. Priced at the premium end of OpenAI's range, and built to earn it.
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 GPT-5.5 and Claude Fable 5.2?
Aymo gives you more than access to individual models—it provides a complete multi-model AI workspace designed for productivity.
OpenAI / GPT-5.5
maxFrontier-Level Coding
OpenAI positions this as its model for the most complex professional work, with coding as the headline use. Handles large codebases, multi-step engineering tasks, and production-quality output.
Highest-Rated Reasoning
OpenAI's own model documentation rates its reasoning Highest, the top of the scale. Reasoning tokens are supported, so the model thinks before it answers, and you control how much thinking it does.
Large Context Window
1,050,000 tokens, among the largest available anywhere. Load an entire codebase, a full research corpus, or a large document set and ask questions across all of it. Prompts above 272,000 input tokens are billed at a higher rate.
Long-Form Professional Writing
Built for output that ships, not quick drafts. Writes up to 128,000 tokens in a single response, which covers long reports, full documentation sets, and extended technical writing without splitting the job up.
Live Web Research
Web search is a supported tool, so it can pull current information into an answer rather than working only from what it was trained on. Its knowledge cutoff is 1 December 2025, so anything more recent needs that search.
Text & Image Input
Reads text and images. OpenAI's documentation lists image as input-only and states that audio and video are not supported. File search is supported, so it can work across uploaded documents.
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 GPT-5.5 and Claude Fable 5.2 on Aymo AI?
Aymo gives you more than access to GPT-5.5 and Claude Fable 5.2—it provides a complete multi-model AI workspace designed for productivity.
Compare Responses
See how GPT-5.5 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.