Claude news · Silicon AI News

September 20265 stories

Anthropic’s Sonnet 5.5 nears Opus at half the token price

Anthropic says it is over 30% faster than Sonnet 5 and cheaper per task. An independent test puts it just behind Opus 5.5, but found heavy token use at top effort.

Anthropic released Claude Sonnet 5.5 on September 28 at the same price as Sonnet 5. That is $2 per million input tokens and $10 per million output tokens, half the price of Opus 5.5. Anthropic says it scores close to Opus 5.5 on several tests. Artificial Analysis, an independent tester, ranks it two points behind Opus 5.5 but measured heavy token use at the highest effort setting.

4 min read

AI ModelsSep 26

GPT-6 Astra and Claude Opus 5 cracked two Enigma messages

People directed both attempts. The expert who runs the message archive checked the results.

Two people used AI models to break German Army Enigma messages from 1941 that nobody had solved. GPT-6 Astra broke one that had resisted every attempt since 2005, and Claude Opus 5 broke another. Frode Weierud, who publishes the messages on his Crypto Cellar website, documented both breaks.

4 min read

AI ModelsSep 24

Anthropic says Claude found a new enzyme system

It has CRISPR-like repeats, but what it does is still unknown.

Anthropic said on September 23 that Claude agents, searching huge DNA databases, spotted an overlooked enzyme system in viruses that infect bacteria. It has evenly spaced repeats like those in CRISPR. Anthropic’s own lab made a first test, but the work is not peer-reviewed.

5 min read

Agents & AppsSep 23

Amazon lets sellers manage their stores from Claude

It came days after Amazon blocked Meta’s shopping agent. Only two assistants can connect so far.

At its Accelerate event on September 23, Amazon released a beta plugin that lets US sellers manage their Amazon stores from Anthropic’s Claude or Amazon’s own Quick assistant. Sellers can check sales and stock, change prices, and update listings. Amazon says the seller approves every action.

4 min read

AI ModelsSep 22

Claude Opus 5.5 cuts token prices by 20%

It tops one independent index. Most other claims come from Anthropic.

Anthropic released Claude Opus 5.5 on September 22 at $4 per million input tokens and $20 per million output tokens. It says the model matches its top Fable 5.1 on most work, and one independent index ranks it first.

5 min read