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Claude Sonnet 4.5

Model family: Claude
Claude Sonnet 4.5 is built to be the everyday workhorse in Anthropic’s lineup. It follows instructions cleanly, plans its steps on harder problems, and explains choices with steady logic, so you can trust it for complex analysis, math, and repository-scale coding without the latency of the heaviest tier. The model accepts images alongside text for document, chart, and screenshot understanding, then returns grounded, well-structured answers that hold up in production. It streams responses for conversational UX, calls tools and functions with precise arguments, and emits deterministic JSON when automations require strict schemas. Long-context handling keeps multi-document prompts coherent, retrieval grounding reduces hallucination, and alignment tuning maintains safe, controllable behavior. Teams adopt Sonnet 4.5 as their default engine—routing only the most demanding tasks to a larger model—because it balances accuracy, speed, and cost while fitting neatly into modern agent and RAG pipelines.
Text Gen 7
Released: September 29, 2025

Overview

Claude Sonnet 4.5 is Anthropic’s balanced, production-ready model—faster than Opus while delivering strong reasoning, coding, and multimodal (text + image) skills. It supports long context, tool/function calling, and schema-true JSON, making it a dependable default for RAG copilots and agents.

About Anthropic

Anthropic is a technology company specializing in artificial intelligence and machine learning solutions.

Industry: Artificial Intelligence
Company Size: 3673
Location: San Francisco, California, US
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Benchmark scores

How Claude Sonnet 4.5 ranks on tracked AI benchmarks. Click any benchmark to see its full leaderboard.

78.8%
87.0%
GPQA Diamond
Knowledge
83.4%
MMMU
Multimodal
77.8%
OSWorld
Agentic
61.4%
Compare across all benchmarks →

Tools using Claude Sonnet 4.5

Last updated: April 6, 2026
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