Claude Opus 5.5
Anthropic released the 推理 model · Launched on 2026-09
Commercial Closed-source
推理
API 可用
Claude Opus 5.5 is Anthropic's new frontier model released on September 22, 2026, built for long-running agentic coding and knowledge work. It reaches roughly Claude Fable 5.1-level quality on most tasks while cutting running cost about 40% below Opus 5: input and output prices are 20% lower and cache reads 60% cheaper. It offers a 1M-token context, 128K max output (up to 300K with the Batch API), and a June 2026 knowledge cutoff.
核心特性
- 1M tokens 上下文
- 128K 最大输出（批量 300K）
- 自适应思考常开
- 长程智能体任务
核心优势
- 接近 Fable 5.1 的质量
- 比 Opus 5 便宜约 40%
- 缓存读取便宜 60%
参数量
未公开
上下文窗口
1M tokens
API 支持
Yes
开源状态
Closed Source
发布日期
2026-09
提供商
Anthropic
输入 $4 / 1M tokens，输出 $20 / 1M tokens；缓存读取 $0.20 / 1M tokens
知识截止 2026 年 6 月；官方称多数任务质量接近 Fable 5.1，成本约为 Opus 5 的六成
