Grok 4.6 vs Claude Fable 5.1
Compare Grok 4.6 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
Grok 4.6 vs Claude Fable 5.1 Overview
Everything you need to know about these AI models, including capabilities, performance, pricing, and technical details.
xAI / Grok 4.6
proDescription
xAI's newest flagship, built for agents for longer tasks. Grok 4.6 is a post-training upgrade over 4.5, tuned to sustain multi-step work without drifting and to verify its own results more often before proceeding. It reads text and images, searches both the web and X, and its knowledge is among the most recent in the catalog. Same context window as the previous generation, with a new top reasoning level for the hardest work.
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 Grok 4.6 and Claude Fable 5.1?
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xAI / Grok 4.6
proLong-Running Coding Agents
xAI tuned it for agents that stay on a coding task across many steps without losing the thread, with reported gains in agentic and terminal coding. Built to turn a broad idea into a working prototype in fewer iterations.
Effort Up To Xhigh
Reasoning effort runs low, medium, high, and a new xhigh level above the previous generation's ceiling, for the hardest problems. xAI reports it self-tests and verifies its own work more often before proceeding.
Room For Large Repositories
A large context window, unchanged from the previous generation. Handles large repositories, long research packets, and extended agent histories, though requests above a high threshold are billed at a higher rate.
Knowledge Work Artifacts
xAI positions it for research, information analysis, and complex work artifacts alongside coding. Suited to long documents and structured output that has to survive review, not just read well.
Web Search And X Search
xAI states Grok knows nothing beyond its training data, and provides server-side Web Search and X Search tools. Its knowledge is recent, and X Search reaches posts no other model can read.
Text And Image Input
xAI accepts text and image inputs in JPG or PNG format, in any order, alongside your prompt, with text output. Send screenshots, diagrams, or scanned pages. Audio and video are not listed as supported inputs.
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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