You can use 4.5 Opus with Claude Code by running it specifically with `--model` pointed towards 4.5 Opus: $ claude --model claude-opus-4-5 Claude Code v2.1

You can use 4.5 Opus with Claude Code by running it specifically with `--model` pointed towards 4.5 Opus: $ claude --model claude-opus-4-5 Claude Code v2.1.37 claude-opus-4-5 · Claude Max /tmp/test Opus 4.6 is here · $50 free extra usage · /extra-usage to enable