Enlarge / The Anthropic Claude logo. (credit: Anthropic / Benj Edwards)

On Thursday, AI-maker and OpenAI competitor Anthropic launched Claude Pro , a subscription-based version of its Claude.ai web-based AI assistant, which functions similarly to ChatGPT. It's available for $20/month in the US or 18 pounds/month in the UK, and it promises five-times-higher usage limits, priority access to Claude during high-traffic periods, and early access to new features as they emerge.

Like ChatGPT, Claude Pro can compose text, summarize, do analysis, solve logic puzzles, and more.

Claude.ai is what Anthropic offers as its conversational interface for its Claude 2 AI language model, similar to how ChatGPT provides an application wrapper for the underlying models GPT-3.5 and GPT-4. In February, OpenAI chose a subscription route for ChatGPT Plus , which for $20 a month also gives early access to new features, but it also unlocks access to GPT-4, which is OpenAI's most powerful language model.

Enlarge (credit: Anthropic)

On Tuesday, Anthropic introduced Claude 2, a large language model (LLM) similar to ChatGPT that can craft code, analyze text, and write compositions. Unlike the original version of Claude launched in March, users can try Claude 2 for free on a new beta website . It's also available as a commercial API for developers.

Anthropic says that Claude is designed to simulate a conversation with a helpful colleague or personal assistant and that the new version addresses feedback from users of the previous model: "We have heard from our users that Claude is easy to converse with, clearly explains its thinking, is less likely to produce harmful outputs, and has a longer memory."

Anthropic claims that Claude 2 demonstrates advancements in three key areas: coding, math, and reasoning. "Our latest model scored 76.5% on the multiple choice section of the Bar exam, up from 73.0% with Claude 1.3," they write. "When compared to college students applying to graduate school, Claude 2 scores above the 90th percentile on the GRE reading and writing exams, and similarly to the median applicant on quantitative reasoning."

Enlarge / An AI-generated image of "AI taking over the world." (credit: Stable Diffusion)

On Tuesday, the Center for AI Safety (CAIS) released a single-sentence statement signed by executives from OpenAI and DeepMind, Turing Award winners, and other AI researchers warning that their life's work could potentially extinguish all of humanity.

The brief statement, which CAIS says is meant to open up discussion on the topic of "a broad spectrum of important and urgent risks from AI," reads as follows: "Mitigating the risk of extinction from AI should be a global priority alongside other societal-scale risks such as pandemics and nuclear war."

High-profile signatories of the statement include Turing Award winners Geoffery Hinton and Yoshua Bengio, OpenAI CEO Sam Altman, OpenAI Chief Scientist Ilya Sutskever, OpenAI CTO Mira Murati, DeepMind CEO Demis Hassabis, Anthropic CEO Dario Amodei, and professors from UC Berkeley, Stanford, and MIT.

Enlarge / An AI-generated image of a robot reading a book. (credit: Benj Edwards / Stable Diffusion)

On Thursday, AI company Anthropic announced it has given its ChatGPT-like Claude AI language model the ability to analyze an entire book's worth of material in under a minute. This new ability comes from expanding Claude's context window to 100,000 tokens, or about 75,000 words.

Like OpenAI's GPT-4 , Claude is a large language model (LLM) that works by predicting the next token in a sequence when given a certain input. Tokens are fragments of words used to simplify AI data processing, and a "context window" is similar to short-term memory—how much human-provided input data an LLM can process at once.

A larger context window means an LLM can consider larger works like books or participate in very long interactive conversations that span "hours or even days," according to Anthropic:

Enlarge / Anthropic's Constitutional AI logo on a glowing orange background. (credit: Anthropic / Benj Edwards)

On Tuesday, AI startup Anthropic detailed the specific principles of its " Constitutional AI " training approach that provides its Claude chatbot with explicit "values." It aims to address concerns about transparency, safety, and decision-making in AI systems without relying on human feedback to rate responses.

Claude is an AI chatbot similar to OpenAI's ChatGPT that Anthropic released in March .

"We’ve trained language models to be better at responding to adversarial questions, without becoming obtuse and saying very little," Anthropic wrote in a tweet announcing the paper. "We do this by conditioning them with a simple set of behavioral principles via a technique called Constitutional AI."