Unverified50% confidenceFactExact time
Almost all of HackerBooks' site code was written by Claude, including the data pipeline and frontend, with the model version labeled Opus 5.5.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
11/1/2026
First Seen
Valid until: 1/30/2027
Sources
Related Entities
Related Claims
Unverifiedclaude.dev has compiled a practical playbook for Opus 5.5 in the Claude Code environment.72% similarVerifiedOpus 5 is the flagship model of Anthropic's Claude series, known for its longer context window (capable of handling codebases of hundreds of thousands of tokens) and more cautious output style.71% similarUnverifiedThe project started in July, initially using Claude Fable 5, later upgraded to Opus 5.5, and was completed almost entirely in Claude Code for Web.68% similarUnverifiedAccording to what Breunig disclosed in a Hacker News comment, the nesformer system was built with Opus 5.5 and its core consists of only two prompts.67% similarUnverifiedThe Databricks model library includes Claude Opus 5.5, Claude Fable 5.1, and more than 60 open-source and frontier models.66% similar
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