Skip to content

Anthropic company blog

Claude Sonnet 4.5

by @AnthropicAI anthropic.com published 2025-09-29

Claude Sonnet 4.5 is the best coding model in the world, strongest model for building complex agents, and best model at using computers.

Read on anthropic.com → Discuss on HN (786) Archived copy

Points: 1,585
HN comments: 786
Submissions: 1
Cited by: 0 commenters

AI & Machine Learning Tech Industry & Business 2025

On Hacker News

Submitted	Title on HN	Points	Comments
Sep 29, 2025	Claude Sonnet 4.5 by adocomplete	1,585	786

More from Anthropic

All 148 posts →

Statement on US government directive to suspend access to Fable 5 and Mythos 5

20263,158 points2,314 commentscited by 11AI & Machine Learning details

Statement from Dario Amodei on our discussions with the Department of War

20262,920 points1,579 commentscited by 14Society, Policy & Culture details

Claude Fable 5

20262,626 points2,159 commentscited by 10AI & Machine Learning details

Claude Opus 4.6

20262,346 points1,031 commentscited by 9AI & Machine Learning details

Claude 3.7 Sonnet and Claude Code

20252,127 points963 commentscited by 6AI & Machine Learning details

Claude 4

20252,013 points1,170 comments AI & Machine Learning details

Related posts from the same era

GPT-4o

OpenAI Blog20243,138 points2,366 commentscited by 16 details

Astra can read and write weights to improve Qwen

Rikiya Takehi20262,960 points899 comments details

HackerTube: YouTube built from videos recommended by HN

karpathy20262,889 points642 comments details

Claude Code is steganographically marking requests

Thereallo20262,445 points750 commentscited by 3 details

Open source AI is the path forward

Meta Newsroom20242,360 points887 commentscited by 5 details

My AI skeptic friends are all nuts

Fly.io Blog20252,356 points2,826 commentscited by 13 details