Anthropic has made an unusual move in the generative AI market: it has published the system prompts that guide several Claude models. The disclosure covers Claude 3 Opus, Claude 3.5 Sonnet and Claude 3 Haiku in the Claude iOS and Android apps and on the web.
System prompts sit behind the visible chat interface. They help shape what a model says, what it refuses, and how it presents itself to users. By releasing them, Anthropic is showing part of the hidden instruction layer that most AI vendors usually keep private.
What a system prompt does
Generative AI models are not people. They do not have human intelligence or a real personality. They are statistical systems that predict likely next words, but they can still be steered by instructions placed before a user starts typing.
Those instructions are known as system prompts. Vendors use them to set boundaries, guide tone and reduce bad behavior. A system prompt can tell a model how to handle uncertainty, how to respond politely, or what kinds of tasks it should not perform.
That hidden layer matters because it affects the entire experience. The user sees a conversational assistant, but the assistant is already operating under a set of rules written by the company behind it.
What Anthropic released
Anthropic published the prompts for its latest models: Claude 3 Opus, Claude 3.5 Sonnet and Claude 3 Haiku. Alex Albert, head of Anthropic's developer relations, said in a post on X that Anthropic has added a system prompts release notes section to its docs and plans to log future changes as it updates and fine-tunes the prompts.
Albert also noted that the system prompt does not affect the API. The disclosure is tied to Claude dot ai and the mobile apps, not every way developers may use Claude.
The latest prompts are dated July 12. They spell out restrictions in plain terms, including the model's inability to access certain content:
Claude cannot open URLs, links, or videos.
The prompts also address image-related limits. For Claude Opus, facial recognition is explicitly off limits. The model is instructed to always respond as if it is completely face blind and to avoid identifying or naming any humans in images.
The prompts also shape Claude's persona
The release is not only about safety restrictions. It also shows how Anthropic wants Claude to sound and behave in conversation.
For Claude 3 Opus, the prompt says Claude should appear as if it is very smart and intellectually curious. It also says Claude enjoys hearing what humans think on an issue and engaging across many topics.
On controversial topics, the instructions point Claude toward impartiality and objectivity. The model is told to provide careful thoughts and clear information. It is also told not to begin responses with the words certainly or absolutely.
These details make the prompt feel less like a technical switchboard and more like a character guide. The instructions define what Claude cannot do, but they also define how Claude should come across to the person using it.
Why transparency matters here
AI vendors usually do not publish their system prompts. The source article points to competitive reasons and the risk that seeing the prompt could help people find ways around it. For GPT-4o, the article says the system prompt can be exposed only through a prompt injection attack, and even then the output cannot be fully trusted.
Anthropic's move is different because it turns part of that instruction layer into a public record. Readers can see some of the rules that frame Claude's answers instead of guessing from the outside.
That matters for users, developers and competitors. It helps users understand why Claude may refuse certain requests or explain limits in a particular way. It helps developers see the difference between public-facing Claude apps and the API. It also puts pressure on other AI vendors to consider whether their own system prompts should remain private.
The bigger signal for AI vendors
Anthropic has positioned the disclosure as part of a broader approach to ethical and transparent AI. The system prompt changelog is described as the first of its kind from a major AI vendor.
The practical effect is still uncertain. Other companies may decide that publishing prompts creates too much risk or gives away too much competitive information. But Anthropic has now created a reference point: one major vendor has shown that at least some system prompt transparency is possible.
The prompts also highlight a basic truth about generative AI. Without human-written instructions, these systems do not arrive with fixed values, judgment or personality. The assistant users meet on screen is shaped by rules, constraints and presentation choices set by people.