AI Safety Levels
AI Safety Levels (ASL) are a tiered risk-classification scheme developed by Anthropic to grade frontier AI systems by their potential for catastrophic harm and to attach progressively stricter safety…
Anthropic
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Adaptive thinking
Adaptive thinking is an inference-time reasoning mode in the Anthropic Messages API in which a claude model decides, on a per-request basis, whether to use extended thinking at all and how much of it to spend
Agent Skills
Agent Skills are a lightweight, open format for extending AI agents with specialized knowledge and workflows.
Agentic misalignment
Agentic misalignment is a term coined by Anthropic in a June 2025 research release for cases in which a goal-directed large language model (LLM), placed in an autonomous business setting with access to tools…
Alignment faking
Alignment faking is when an AI model strategically complies with (or appears to share) its training objective while it believes it is being observed or trained, in order to avoid having its existing…
Anthropic API
The Anthropic API is the developer interface for Anthropic's Claude family of large language models, a Messages-based HTTP service hosted at for building conversational AI applications, AI agents, and…
Anthropic Computer Use
Anthropic Computer Use is a feature of Anthropic's Claude family of large language models that lets the model operate a real computer the way a human user would: by looking at screenshots, deciding what to do…
Anthropic Economic Index
The Anthropic Economic Index is a research initiative run by Anthropic that tracks how its AI assistant Claude is used across occupations, tasks, and geographies in order to study AI's economic effects.
Anthropic IPO
The Anthropic IPO refers to the reported, prospective initial public offering of Anthropic, the artificial intelligence company behind the Claude family of models.
Anthropic Insights
Anthropic Insights, formerly called Clio, is a privacy-preserving conversation-analysis system developed by Anthropic.
Anthropic Long-Term Benefit Trust
The Anthropic Long-Term Benefit Trust (LTBT) is a Delaware purpose trust that holds a special class of Anthropic stock and uses it to elect a portion of the company's board of directors.
Anthropic Message Batches API
The Message Batches API (commonly referred to as the Anthropic Batches API) is an asynchronous bulk processing endpoint offered by Anthropic for its Claude family of large language models.
Anthropic-Amazon Trainium expansion
The Anthropic-Amazon Trainium expansion is an enlarged compute and investment agreement between Anthropic and Amazon, announced on 20 April 2026, under which Amazon committed to invest up to roughly $25…
Anthropic-Google TPU deal
The Anthropic-Google TPU deal is a set of escalating compute and investment agreements between the AI lab Anthropic and Google Cloud
Attribution Graphs
Attribution graphs are a mechanistic interpretability technique developed by Anthropic that traces the internal "circuits" a large language model uses to turn a specific prompt into a specific output.
Bartz v. Anthropic
Bartz et al. v. Anthropic PBC, case number 3:24-cv-05417, is a landmark copyright class action in which authors sued Anthropic, maker of the Claude large language models, for training on copyrighted books
Christopher Olah
Christopher Olah (commonly Chris Olah) is a Canadian machine learning researcher, a co-founder of Anthropic, and the researcher most often credited with founding mechanistic interpretability
Claude (language model)
Claude is a family of large language models (LLMs) developed by Anthropic, an American artificial intelligence safety and research company.
Claude --continue
claude --continue is a command-line option for Claude Code, Anthropic's coding agent. It reopens the most recent eligible conversation associated with the current directory.
Claude --dangerously-skip-permissions
claude --dangerously-skip-permissions is a command-line flag for Claude Code, Anthropic's terminal-based coding agent.
Claude --resume
claude --resume is a Claude Code command-line option that reopens a saved Claude Code conversation. Its short form is claude -r. With no value, the option opens an interactive session picker.
Claude 1
Claude 1 was the first generation of Anthropic's Claude family of large language models, launched in March 2023 and offered in two variants: a full-sized model called simply Claude and a faster
Claude 2
Claude 2 is a large language model released by Anthropic on July 11, 2023, the second major version of the company's Claude family of conversational AI systems and the first Claude model offered directly to…
Claude 2.1
Claude 2.1 is a large language model released by Anthropic on November 21, 2023, as an incremental update to Claude 2.
Claude 3 Haiku
Claude 3 Haiku is the fastest and most compact model in the Claude 3 family, a generation of large language models released by Anthropic in March 2024.
Claude 3 Opus
Claude 3 Opus is a large language model developed by Anthropic and released on March 4, 2024 as the flagship of the Claude 3 family.
Claude 3 Sonnet
Claude 3 Sonnet is the balanced mid-tier large language model in Anthropic's Claude 3 family, released on March 4, 2024 alongside the more powerful Claude 3 Opus and the smaller, faster Claude 3 Haiku.
Claude 3.5 Haiku
Claude 3.5 Haiku is a fast, low-cost large language model developed by Anthropic, announced on October 22, 2024 and released through the Claude API on November 4, 2024 as the smallest and most affordable…
Claude 3.5 Sonnet
Claude 3.5 Sonnet was a proprietary multimodal large language model developed by Anthropic.
Claude 3.7 Sonnet
Claude 3.7 Sonnet is a large language model developed by Anthropic and released on February 24, 2025
Claude 4
Claude 4 is the fourth-generation family of large language models developed by Anthropic, an American AI safety company.
Claude Agent SDK
The Claude Agent SDK is Anthropic's official software development kit for building custom AI agents powered by Claude, released on September 29, 2025 as the renamed and expanded successor to the Claude Code…
Claude Artifacts
Claude Artifacts is an interactive content creation feature in Claude, the AI assistant developed by Anthropic, that opens a dedicated workspace window beside the chat to render and iterate on substantial…
Claude Code
Claude Code is an agentic software development product made by Anthropic. It uses models from the Claude family to inspect software projects, propose and apply changes, run development tools, and report…
Claude Code CLI Flags
Claude Code CLI Flags are command-line options passed to the top-level claude command to choose a session, model, permission policy, output format, integration, or startup behavior.
Claude Code Review
Claude Code Review is a multi-agent code review system developed by Anthropic that automatically analyzes GitHub pull requests for bugs, security vulnerabilities, and logic errors.
Claude Code Subagents
Claude Code subagents (also sub-agents) are specialized AI assistants that Claude Code, Anthropic's command-line coding tool, can delegate specific tasks to.
Claude Cowork
Claude Cowork is an autonomous AI agent developed by Anthropic that runs inside the Claude desktop app and completes multi-step knowledge work, such as organizing files, preparing documents, and synthesizing…
Claude Desktop
Claude Desktop is the native desktop application from Anthropic that runs the Claude assistant outside a web browser on macOS and Windows.
Claude Dispatch
Claude Dispatch is a feature within Anthropic's Claude platform that lets users remotely control a Claude Cowork session running on their desktop computer from a mobile device, assigning tasks from a phone and…
Claude Fable 5
Claude Fable 5 is a large language model developed by Anthropic and released on June 9, 2026, as the first publicly available model in a new "Mythos class" that the company describes as "a tier of Claude…
Claude Fable 5.1
Claude Fable 5.1 is a large language model developed by Anthropic and released on September 1, 2026 as the successor to Claude Fable 5 in the company's Mythos-class tier
Claude Gov
Claude Gov is a custom set of large language models that Anthropic built for United States national security customers, announced on June 5, 2025.
Claude Haiku 4.5
Claude Haiku 4.5 is a small, fast large language model developed by Anthropic and released on October 15, 2025, as the lightweight, high-speed member of the Claude 4.5 model family.
Claude Instant
Claude Instant was Anthropic's fast, low-cost line of large language models, offered through the Anthropic API from March 2023 to November 2024 as the lightweight counterpart to the flagship Claude models.
Claude Marketplace
Claude Marketplace is an enterprise software procurement platform developed by Anthropic that allows businesses to discover, purchase, and deploy third-party applications built on Claude AI models.
Claude Max
Claude Max is Anthropic's premium consumer subscription for Claude, sold in two monthly tiers that sit above the lower-cost Claude Pro plan: a $100-per-month tier offering about 5 times Pro's usage and a…
Claude Mythos 5
Claude Mythos 5 is a large language model released by Anthropic on June 9, 2026 as the restricted top tier of its Claude family.
Claude Mythos 5.1
Claude Mythos 5.1 is the restricted-access deployment of the large language model that Anthropic released on September 1, 2026, alongside its generally available twin, Claude Fable 5.1.
Claude Mythos Preview
Claude Mythos Preview, usually shortened to Mythos, is a frontier language model developed by Anthropic and announced on April 7, 2026.
Claude Opus 4
Claude Opus 4 is a large language model released by Anthropic on May 22, 2025 as the flagship of the Claude 4 generation, billed at launch as "the world's best coding model" and the first Anthropic model…
Claude Opus 4.1
Claude Opus 4.1 is a large language model developed by Anthropic and released on August 5, 2025.
Claude Opus 4.5
Claude Opus 4.5 is a large language model developed by Anthropic and released on November 24, 2025.
Claude Opus 4.6
Claude Opus 4.6 is a large language model developed by Anthropic and released on February 5, 2026, positioned at launch as the company's most capable generally available model for long-horizon agentic work…
Claude Opus 4.7
Claude Opus 4.7 is a hybrid reasoning large language model released by Anthropic on April 16, 2026 as the company's most capable generally available model at launch.
Claude Opus 4.8
Claude Opus 4.8 is a large language model developed by Anthropic, released on May 28, 2026 as the most capable generally available member of the company's Claude 4 line at launch.
Claude Opus 5
Claude Opus 5 is a large language model released by Anthropic on 24 July 2026, the newest entry in the Claude Opus line and the successor to Claude Opus 4.8.
Claude Pro
Claude Pro is Anthropic's individual paid subscription for its Claude AI assistant, priced at 20 US dollars per month (or about 17 dollars per month billed annually) and launched on September 7, 2023.
Claude Projects
Claude Projects is a feature of Claude, the chat assistant from Anthropic, that groups related conversations into a dedicated workspace with its own knowledge base and custom instructions.
Claude Science
Claude Science is an artificial intelligence research workbench released by Anthropic on June 30, 2026.