Claude Code defaults to Opus 5.5 with 1M context; Pro and Team plans follow

Claude Code v2.1.280 发布，新增 Claude Opus 5.5 为默认 Opus 模型

Claude Code v2.1.280 switches the default Opus model to Claude Opus 5.5 with a 1M-token context window. Pricing is $4/Mtok input, $20/Mtok output, and $0.20/Mtok for cache reads. Pro and Team Standard plans also move from Sonnet to Opus as the default. The post doesn't include performance comparisons or the reasoning behind the switch.

Why it matters: Anthropic product update: Claude Code defaults to Opus 5.5 with 1M context, directly affecting developer workflows. HKR all hit, but the post lacks performance comparisons or rationale for the switch — that gap keeps it below 80.