GPT-5 vs Claude Opus 5.5
Compare GPT-5 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-5 vs Claude Opus 5.5 Overview
Everything you need to know about these AI models, including capabilities, performance, pricing, and technical details.
OpenAI / GPT-5
maxDescription
OpenAI's earlier frontier model, still capable across coding, reasoning, and agentic work. GPT-5 costs substantially less than OpenAI's newest models and handles a large context window. The catch is age: its knowledge is dated, and OpenAI now labels it a previous-generation model. Worth picking when the task is general, the budget matters, and recency does not.
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-5 and Claude Opus 5.5?
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OpenAI / GPT-5
maxBudget Agentic Coding
OpenAI describes GPT-5 as its previous model for coding, reasoning, and agentic tasks across domains. It still writes, debugs, and reviews code across languages, and runs multi-step engineering work at a fraction of frontier pricing.
Adjustable Reasoning Effort
Reasoning effort runs from minimal through low, medium, and high, so you can trade thinking time against cost per request. Reasoning tokens are supported, so the model works through a problem before it answers.
Room For Long Documents
A large context window, roughly 300,000 words. Enough for long reports, large contracts, and substantial codebases in a single session, though short of the newer frontier models.
Long Outputs At Lower Cost
Produces long responses at a fraction of the price of OpenAI's newest models. Good value on long-form generation where the reasoning demand is modest rather than at the frontier.
Analysis On Older Knowledge
Its training data is dated by current standards, so it is fine for processing text you supply but weaker on recent events, which need live sources rather than the model's own knowledge.
Text And Image Input
Reads text and images in the same prompt, so you can send screenshots, diagrams, charts, or scanned pages alongside your question. Output is text only. OpenAI's documentation does not list audio or video input.
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.
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