GPT-6 Luna vs Claude Opus 5.5
Compare GPT-6 Luna and Claude Opus 5.5 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 Opus 5.5 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 Opus 5.5
maxDescription
Anthropic's newest flagship, and the first in its Claude 5.5 family. Anthropic positions Opus 5.5 to perform at the level of its most capable model on most work, while costing meaningfully less to run than the previous Opus. It reads text and images, holds a very large context, and reasons before every answer with adjustable effort. Anthropic calls it their daily driver for serious coding, computer use, and knowledge work, with its knowledge current to mid-2026.
About
About
Capabilities
Capabilities
Comparison
Why Use GPT-6 Luna and Claude Opus 5.5?
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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 Opus 5.5
maxDaily-Driver Coding
Anthropic positions it as its everyday model for serious coding and agentic work, reaching its most capable model's level on most tasks. Built for real software engineering across many steps rather than isolated snippets.
Adaptive Thinking Always On
Reasoning is always on, with an effort dial rather than an off switch, defaulting to medium. Anthropic reports medium effort here, matching the previous Opus at high, so it thinks efficiently rather than at length.
Room For Whole Projects
A very large context window with no smaller default. Anthropic reports stronger long-context management, so instruction following and reasoning hold across a full codebase or a long agent run.
Precise Document Work
Anthropic's strongest Opus for vision and document work: dense filings, charts, screenshots, and diagrams read at high fidelity. It also writes more concisely than the previous Opus, a deliberate change.
Deep Computer Use
Anthropic reports that its best Opus is for computer use, handling multi-step tasks that span several applications and require planning and judgment. Suited to agentic work that operates real software, not just answering questions.
Text And Image Input
Reads text, images, and PDFs in the same prompt, so you can send screenshots, filings, diagrams, or charts alongside your question. Output is text only. Audio and video are not accepted.
Why Aymo
Why chat with GPT-6 Luna and Claude Opus 5.5 on Aymo AI?
Aymo gives you more than access to GPT-6 Luna and Claude Opus 5.5—it provides a complete multi-model AI workspace designed for productivity.
Compare Responses
See how GPT-6 Luna and Claude Opus 5.5 performs alongside Claude, Gemini, Grok, and other leading AI models.
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