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llm CLI plugin llm-anthropic 0.29 adds support for Claude Opus 5.5

Simon Willison reports llm-anthropic 0.29 adds support for Claude Opus 5.5, runnable as llm -m claude-opus-5.5.

Plugin update

llm-anthropic 0.29 adds support for Claude Opus 5.5, per Simon Willison's release post. [1]

What's new

The release shows usage as llm -m claude-opus-5.5 with a prompt. [1]

Context

The post is tagged llm and anthropic; no pricing, availability, or benchmarks are provided. [1]

Sources

  1. Simon Willison · Reporting · Sep 22, 2026
    llm-anthropic 0.29
    llm-anthropic 0.29 Adds support for Claude Opus 5.5: llm -m claude-opus-5.5
    Release: llm-anthropic 0.29