GPT-6 Luna vs Claude Fable 5.1
Compare GPT-6 Luna 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
GPT-6 Luna vs Claude Fable 5.1 Overview
Everything you need to know about these AI models, including capabilities, performance, pricing, and technical details.
OpenAI / GPT-6 Luna
maxDescription
OpenAI's most efficient GPT-6 model, built for focused, high-volume work. Luna handles extraction, summarisation, classification, and other well-defined tasks that run thousands of times a day, at a price low enough to rival open models. It reads text and images, shares the family's very large context, and OpenAI reports it matches the previous flagship on factuality at a fraction of the cost. Its knowledge is the most recent in the family.
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 GPT-6 Luna and Claude Fable 5.1?
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OpenAI / GPT-6 Luna
maxHigh-Volume Coding Tasks
Built for small, well-scoped coding jobs and as a fast sub-agent in larger systems. OpenAI reports it landing close behind Sol on coding benchmarks while costing a fraction as much per task.
Effort From Off To Max
Reasoning effort runs from none through max, defaulting to medium. Keep it off for the fastest, cheapest responses on simple work, or raise it when a task needs more care, without changing models.
Room For Long Inputs
The same very large context window as the larger GPT-6 models. Big enough to summarise long documents or classify large batches in one pass, unusual capacity at this price.
Extraction And Summarisation
OpenAI names field extraction, ticket summarisation, and classification among its core uses. Built to process high volumes of structured text quickly and cheaply rather than write long-form content.
Web Search And Recent Knowledge
Supports web search and tools, and carries the most recent knowledge cutoff in the family. Together, those keep it current on live questions despite its budget positioning.
Text And Image Input
Reads text and images in the same prompt, so you can send screenshots or scanned pages alongside your question. Output is text only. Audio and video are not supported.
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.
Why Aymo
Why chat with GPT-6 Luna and Claude Fable 5.1 on Aymo AI?
Aymo gives you more than access to GPT-6 Luna and Claude Fable 5.1—it provides a complete multi-model AI workspace designed for productivity.
Compare Responses
See how GPT-6 Luna and Claude Fable 5.1 performs alongside Claude, Gemini, Grok, and other leading AI models.
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Upload Once
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