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Claude

Building reliable, interpretable AI systems

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September 29, 2025

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Claude4.5

Large Language Models

39,513

4.2(62)40

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485

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Haiku 4.5Sonnet 4.5Sonnet 3.7Haiku 3.5Opus 4Sonnet 4Opus 4.1Opus 3

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Building reliable, interpretable AI systems

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Overview Discussion 40

Overview

Anthropic's Claude is an AI assistant that can be customized to perform a wide range of tasks with a human-like touch. As a Constitutional AI, Claude is designed to be reliable, interpretable, and steerable, with harmlessness training to ensure that it can handle even unpleasant or malicious conversational partners with grace.

The tool can be integrated into any product with minimal effort, via standard APIs. It can be trained to handle customer service requests, parse legal documents, act as a virtual sales representative, assist with coaching for personal or career development, and much more.

With Claude, users can process unstructured text data at scale to extract structured insights, automate workflows, have natural conversations or get answers to common questions.

Anthropic claims that since deploying Claude, its clients have seen higher user engagement, stronger feedback, and increased business opportunities. The tool is available 24/7 with servers designed to scale and meet demanding workloads.

As a user, you can customize Claude's personality, tone, and behavior to match your brand's image. Your data is secured according to industry-standard best practices for data handling and retention, ensuring that Claude keeps your information private and confidential.

In conclusion, Claude aims to be a flexible and personalized AI solution for various business, academic, and personal needs.

Releases

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Claude 4.5

Sep 29, 2025

Claude Sonnet 4.5

Stronger reasoning & math: fewer slips on multi-step problems.

Better coding: clearer fixes, tighter adherence to specs.

More reliable tool/JSON calls: fewer schema errors, cleaner arguments.

Improved vision: nicer OCR and chart/screenshot understanding.

Holds long context better: steadier multi-doc coherence.

Lower, steadier latency: snappier responses under load.

Calmer alignment: fewer overcautious refusals; safer wording.

Claude 4

May 22, 2025

Delivers significantly stronger performance in coding, advanced reasoning, and agentic (autonomous) tasks.

Demonstrates a 65% reduction in shortcut-taking and loophole exploitation.

Opus 4 is positioned as the world’s best coding model, excelling on benchmarks like SWE-bench and Terminal-bench.

Sonnet 4 achieves higher accuracy and precision in complex, multi-file codebase tasks.

Introduces persistent memory: with permission, can extract, summarize, and retain information across sessions, enabling continuity and domain expertise over long-term projects.

Features enhanced tool use, including web search and parallel tool execution.

Supports deeper, multi-step reasoning for complex tasks.

Maintains or improves multimodal capabilities (text and images) and supports a large context window for handling extensive information.

Offers new API capabilities, including a code execution tool, MCP connector, Files API, and prompt caching for more powerful agent workflows.

Claude Code is now generally available and integrated with developer tools like GitHub Actions, VS Code, and JetBrains, supporting background tasks and direct file edits.

Pricing remains competitive: Opus 4 at $15/$75 per million tokens (input/output), Sonnet 4 at $3/$15 per million tokens.

Sonnet 4 is available to free users; both Opus 4 and Sonnet 4 are included in Pro, Max, Team, and Enterprise plans.

Provides more precise, reliable, and steerable outputs, with improved adherence to detailed instructions.

Claude 3.7

Feb 24, 2025

Enhanced reasoning capabilities for complex problems
New "extended thinking mode" for Pro users
Better at multi-step logical problem solving
Improved accuracy in technical domains like math and coding
More precise following of complex instructions
Better context maintenance in long conversations
Stronger analytical capabilities for data interpretation
More nuanced understanding of ambiguous queries
Improved consistency in factual responses
Better at self-correction when working through problems

Claude 3.5

Jun 20, 2024

Claude 3.5 is an enhanced version of Claude 3, bringing improvements in performance, safety, and user interaction. It offers more precise and contextually relevant responses, with better handling of complex tasks like coding, summarization, and in-depth queries compared to Claude 3.

Safety features in Claude 3.5 are further refined, reducing the likelihood of generating harmful or biased content. The model is better aligned with ethical standards, ensuring that its outputs are both reliable and responsible.

Claude 3.5 benefits from an updated dataset, allowing it to draw from a wider and more current range of information. This results in more accurate and relevant answers, improving the overall quality of interactions and content creation.

The user experience is smoother with Claude 3.5, featuring more natural conversation patterns and improved engagement. It maintains context better over longer interactions, making it more effective for various applications.

Overall, Claude 3.5 builds on the foundation of Claude 3 with noticeable enhancements in accuracy, safety, and usability, making it a more advanced and reliable AI tool.

Claude 3

Mar 4, 2024

Claude 3 is a significant upgrade over Claude 2.1, offering enhanced performance, safety, and conversational abilities. It delivers more accurate and contextually aware responses, handling complex tasks like summarization, coding, and nuanced queries more effectively than its predecessor.

Claude 3 includes advanced safety mechanisms, further minimizing the risk of generating harmful or biased content. The model’s alignment with ethical guidelines is stronger, making it even more reliable and responsible in its outputs.

With access to an updated and broader dataset, Claude 3 has a deeper understanding of a wide range of topics. This enables it to provide more informed and relevant answers, improving the quality of interactions and content generation.

The user experience is noticeably smoother with Claude 3, thanks to improved conversational flow and engagement. It is more adept at maintaining context over longer interactions, making it a better fit for diverse applications.

Overall, Claude 3 builds on the strengths of Claude 2.1 with significant advancements in accuracy, safety, and usability, making it a more powerful and refined AI tool.

Claude 2.1

Dec 18, 2023

Claude 2.1 is an incremental upgrade over Claude 2, featuring improvements in performance and safety. While both versions excel at understanding and generating natural language, Claude 2.1 offers even better accuracy and handling of complex tasks like summarization and coding.

Safety measures are further refined in Claude 2.1, with enhanced mechanisms to reduce the risk of generating harmful or biased content. The model’s alignment with ethical guidelines is also improved, ensuring more responsible AI behavior.

Claude 2.1 benefits from updated training data, making it more knowledgeable and better at understanding nuanced queries. This upgrade allows it to provide more contextually accurate and relevant responses.

Interaction with Claude 2.1 is smoother, with more natural and engaging conversation patterns. It offers a more user-friendly experience while maintaining the strengths of Claude 2.

Overall, Claude 2.1 represents a more polished version of Claude 2, with better performance, safety, and usability.

Claude 2

Jul 11, 2023

Claude 2 is an advanced version of Anthropic’s AI language model, building on the foundation of Claude 1 with significant improvements in performance and capability. It handles complex instructions, summarization, and coding tasks more effectively, offering more coherent and contextually accurate responses.

Safety and alignment are enhanced in Claude 2, with stronger measures to reduce harmful or biased content. The model adheres more closely to ethical guidelines, ensuring responsible AI usage while better understanding and following user intentions.

Training on a more recent and extensive dataset gives Claude 2 a broader knowledge base and improved ability to comprehend nuanced topics. This makes it more effective in various applications, from content generation to user interaction.

Claude 2 also features refined interaction patterns, providing more relevant and engaging responses. Its ability to sustain longer, meaningful conversations enhances user experience and makes it more suitable for diverse use cases.

Efficiency is another key upgrade, with Claude 2 optimized for faster response times and cost-effective deployment. This makes it a more powerful and practical tool compared to its predecessor, Claude 1.

Initial release

March 14, 2023

Initial release of Claude.

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