Grok 4.3 vs Claude Opus 5
Compare Grok 4.3 and Claude Opus 5 side-by-side. See comparisons of price, response speed, accuracy, and file support to choose the best model for your task.
Overview
Grok 4.3 vs Claude Opus 5 Overview
Everything you need to know about these AI models, including capabilities, performance, pricing, and technical details.
xAI / Grok 4.3
proDescription
xAI's previous flagship, and still the Grok model with the largest context window. Grok 4.3 holds a million tokens, double what the newer generation offers. xAI positions it around a low hallucination rate, agentic tool calling, and instruction following. It reads text and images, searches the web and X, and lets you turn reasoning off entirely when speed matters more than depth.
Anthropic / Claude Opus 5
maxDescription
Anthropic's newest Opus model, and the successor to Opus 4.8. Opus 5 reaches near-frontier intelligence at the same price as the model it replaces, and lets you set how hard it works per task. It reasons before answering by default, checks its own output, and reads text and images across a very large context. Built for long-horizon coding and agentic work that runs with little supervision.
About
About
Capabilities
Capabilities
Comparison
Why Use Grok 4.3 and Claude Opus 5?
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xAI / Grok 4.3
proAgentic Coding and Tool Calling
xAI positions this model on agentic tool-calling and instruction-following, which is what coding agents actually run on. Function calling and structured outputs are both supported natively.
Reasoning You Can Switch Off
Effort runs at none, low, medium, or high. None means no reasoning at all, so you can drop it entirely for simple work and pay only for the answer rather than the thinking.
Large Context Window
Handles a one million tokens, twice the window of the newer Grok generation. Load an entire repository or a large document set in one pass. Requests above 200,000 tokens are billed at a higher rate.
Low Hallucination
xAI leads its own description with non-hallucination rate and instruction-following, which matter most for writing that has to be accurate and stay within the brief you gave it.
Web Search and X Search
xAI states that Grok knows nothing beyond its training data and provides server-side Web Search and X Search tools to bridge the gap. X Search reaches posts and threads no other model can read.
Text and Image Input
xAI lists modalities as text and image in, text out. Send screenshots, diagrams, or scanned pages alongside your prompt. Audio and video are not listed as accepted inputs.
Anthropic / Claude Opus 5
maxSelf-Verifying Coding
Anthropic's strongest coding model. It produces code with minimal oversight, then checks its own work, catching and fixing its own mistakes before handing the result back rather than waiting to be corrected.
Effort You Set
A per-task effort dial from low to high. Low returns faster and cheaper on simple work; high lets the model reason as long as a hard problem needs. Thinking is on by default.
Consistent Full-Window Context
A very large context window with no smaller default. Anthropic states instruction following, tool calling, and reasoning stay consistent across the whole window, which matters for large codebases and long agent runs.
Enterprise Knowledge Work
Built for high-stakes enterprise and knowledge work. Suited to tasks where the output has to be right the first time rather than merely drafted, alongside its coding and agentic strengths.
Long-Horizon Agentic Work
Carries multi-step tasks through to completion with limited supervision, filling gaps in incomplete instructions, testing as it goes, and recovering from its own errors without a nudge.
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 Grok 4.3 and Claude Opus 5 on Aymo AI?
Aymo gives you more than access to Grok 4.3 and Claude Opus 5—it provides a complete multi-model AI workspace designed for productivity.
Compare Responses
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