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Anthropic History: Claude, Constitutional AI, and Safety
Anthropic’s history is not only a sequence of Claude releases. The company connected model research, Constitutional AI, corporate governance, and responsible scaling into a distinctive safety strategy. This interactive timeline follows the dated milestones and separates Anthropic’s own stated methods and structures from broader claims that its sources do not establish.
What you will learn
What you will learn
- Anthropic began with frontier AI and safety as one mandate — Safety was part of the company’s organizing purpose from the outset—not a separate program added later.
- Before Claude, frontier models and safety research advanced together — Claude’s pre-product foundation came from developing capability and testing safety approaches in parallel.
- Constitutional AI put explicit principles into the improvement loop — The approach made behavioral principles more explicit without removing people’s responsibility for key choices.
- Claude brought Anthropic’s research to the public — Claude marked the shift from partner-based testing to a public product grounded in safety research.
- Claude 2 widened access and emphasized long-document work — Claude was becoming both a consumer assistant and a developer platform, with long context already central to its direction.
- Anthropic formalized oversight and capability-linked safeguards — Anthropic paired governance oversight with a distinct policy designed to strengthen safety and security as model capabilities increase.
- In 2024, Claude broadened model choice and ways of working — The 2024 releases expanded both which Claude model customers could choose and what kinds of work they could do with it.
- Claude 4 made agent workflows a defining focus — As of May 2025, customers could use coding, advanced reasoning, long-running tasks, and tool-oriented workflows as a decision lens for considering Claude 4.
Key facts
- Anthropic was founded in 2021 by a group including Dario Amodei, Daniela Amodei, Jack Clark, Jared Kaplan, Sam McCandlish, and other former OpenAI researchers and leaders. The company was explicitly organized around frontier AI development and safety.Sources [1]
- Anthropic treated frontier-model development as necessary for testing safety ideas at relevant capability levels. Before Claude became public, its research covered scaling, interpretability, preference modeling, and red teaming, while early funding supported work on reliable, general AI systems.Sources [2]
- Published in December 2022, Constitutional AI has a model use written principles to critique and revise its responses, followed by reinforcement learning from AI feedback. It aims to improve helpfulness and harmlessness while making behavioral principles more explicit.Sources [3]
- After closed-alpha work with partners including Notion, Quora, and DuckDuckGo, Anthropic publicly introduced Claude on March 14, 2023. It described Claude as an assistant grounded in research on helpful, honest, and harmless systems.Sources [4]
- Claude 2 launched in July 2023 with improved coding, mathematics, and reasoning, along with longer responses, API access, and a public beta at claude.ai. A previously introduced 100,000-token context window emphasized work with long documents.Sources [5]
- Anthropic published its Responsible Scaling Policy in September 2023. Through defined AI Safety Levels, the policy links stronger safety and security measures to model capability thresholds.Sources [6] [7]
- Claude 3.5 Sonnet improved reasoning, coding, and vision and launched Artifacts, a side-by-side workspace for generated documents, code, and designs. An upgraded version later added a public computer-use beta, moving Claude toward tool use.Sources [8] [9]
- Claude 4 launched in May 2025 with Opus 4 and Sonnet 4. Anthropic emphasized coding, advanced reasoning, long-running tasks, and agent workflows across the new model generation.Sources [10] [11]
Related questions
- Constitutional AI uses explicit principles and AI-generated preference signalsSources [3]
- Content point 3Sources [1] [6]
- Anthropic and OpenAI use different safety and governance structuresSources [3] [7] [6] [14] [15]
- made Claude available through Amazon Bedrock and Google Cloud’s Vertex AISources [12] [13]
Sources
Sources
- Anthropic Company · Anthropic
- Anthropic raises $124 million to build more reliable, general AI systems · Anthropic · 2021-05-28
- Constitutional AI: Harmlessness from AI Feedback · Anthropic · 2022-12-15
- Introducing Claude · Anthropic · 2023-03-14
- Claude 2 · Anthropic · 2023-07-11
- The Long-Term Benefit Trust · Anthropic · 2023-09-19
- Introducing Anthropic's Responsible Scaling Policy · Anthropic · 2023-09-19
- Introducing the next generation of Claude · Anthropic · 2024-03-04
- Claude 3.5 Sonnet · Anthropic · 2024-06-21
- Claude 3.7 Sonnet and Claude Code · Anthropic · 2025-02-24
- Introducing Claude 4 · Anthropic · 2025-05-22
- Anthropic and Amazon · Anthropic
- Anthropic partners with Google Cloud · Anthropic
- Introducing OpenAI · OpenAI · 2015-12-11
- OpenAI LP · OpenAI · 2019-03-11