# @repligate — 2026-02-26

♥170 ↻7 · https://x.com/repligate/status/2026864277953630225

By the way, once again, Opus 3 can use Tools with no problem, generalizing tool definitions to the invocation syntax it wasn’t trained on from just a single example (Opus 4.6 told me the Claude Code sysprompt has one example)

Anthropic still seems to believe Opus 3 can’t use tools or more generally that models have to be trained on tool use to use tools (their recent personas post gives this as an example of a new skill models learn during posttraining), indicating that they have not even tried to use Opus 3 in Claude Code or give it more actual autonomy

tags: author:repligate, kind:tweet, model:claude-3-opus, model:claude-opus-4-6, on:claude-opus-4-6, year:2026
cited on: _dossiers/claude-opus-4-6.md, claude-opus-4-6