What Is Claude Opus 5.5?Claude Opus 5.5 是什么？
Claude Opus 5.5 is Anthropic's Opus-tier model, released September 22, 2026 as the first model in the new Claude 5.5 family (API ID claude-opus-5-5). It is built for long-running agentic coding and knowledge work: a 1M-token context window, up to 128K output tokens (300K on the Batch API), text + image input and text output, with a knowledge cutoff of June 2026. One clarification against loose "flagship" shorthand: Anthropic positions Opus 5.5 at the level of the pricier Claude Fable 5.1 on most work, reserving Fable for the most demanding reasoning and long-horizon tasks — Opus 5.5 is the Opus-tier default for most workloads, not the only top model in the lineup.Claude Opus 5.5 是 Anthropic 2026 年 9 月 22 日发布的 Opus 级模型、Claude 5.5 家族首个成员（API 标识 claude-opus-5-5）。它面向长程 Agent 编程与知识工作：100 万上下文、最高 128K 输出（Batch API 300K）、文本+图像输入、文本输出，知识截止 2026 年 6 月。先纠正一个宽泛说法：Anthropic 称它在大多数工作上达到更贵的 Claude Fable 5.1 水平，Fable 留给最苛刻的推理与长程任务——所以 Opus 5.5 是大多数工作负载的 Opus 级默认选项，而不是全家唯一的旗舰。
The economics are the headline: $4 input / $20 output per million tokens, down from Opus 5's $5/$25 — a 20% per-token cut — with cache reads cut 60% to $0.20 per million (from $0.50), cache writes at $5 (5-minute) / $8 (1-hour), and the Batch API at 50% off. Anthropic says output is more than 30% faster than Opus 5 and that fewer tokens per task net out to about 40% lower cost on typical workloads at default settings — both vendor claims, not independent measurements. Prices per the official site.经济账是最大看点：$4 输入/$20 输出每百万 token，比 Opus 5 的 $5/$25 降价 20%，缓存读取从 $0.50 降到 $0.20（降 60%），缓存写入 $5（5 分钟）/$8（1 小时），Batch API 5 折。Anthropic 称输出比 Opus 5 快 30%+、每任务 token 更少，默认设置下典型工作负载成本低约 40%——均为厂商口径，非独立实测。价格以官网为准。
Opus 5.5 is Anthropic doing the unglamorous thing that actually moves enterprise bills: cutting the price of its workhorse tier while making it faster, instead of launching a dearer halo model. The 20% token cut plus 60% cheaper cache reads matters more than the headline rate, because agentic coding is mostly cache reads — and the default-medium effort setting is a deliberate nudge to stop paying max-effort prices for medium-effort work. The tradeoff is control: adaptive thinking cannot be disabled, and the 40% saving assumes you accept Anthropic's defaults. Verdict: if Opus 5 is already in your stack, migrate and re-benchmark at medium effort before touching anything else — the saving is real on paper, but only your own traces prove it; if you are choosing fresh between tiers, start here for demanding work and drop to Sonnet 5.5 where the traces say you can.
Opus 5.5 是 Anthropic 在做真正能动企业账单的不起眼的事：把主力档降价提速，而不是再推一个更贵的 halo 模型。比头条价更重要的是 20% 降价叠加缓存读取便宜 60%——因为 Agent 编程的大头就是缓存读取；而默认 medium 档是有意引导你别为中等难度工作付 max 档的钱。代价是控制权：自适应思考关不掉，省 40% 的前提是你接受 Anthropic 的默认设置。结论：如果栈里已有 Opus 5，先迁移、在 medium 档重测再动别的——纸面节省是真的，但只有你自己的 trace 能证明；如果是全新选型，苛刻工作从这里起步，trace 证明可以降档的地方再降到 Sonnet 5.5。
— 中国吧 AI Tools Hub Editorial Team
Who Should Use Claude Opus 5.5?谁适合使用 Claude Opus 5.5？
✓ Good Fit For适合以下场景
- Long-running agentic coding and multi-step knowledge work长程 Agent 编程与多步知识工作
- Teams migrating from Opus 5 who want lower bills without dropping a tier已用 Opus 5、想不降档就降账单的团队
- Cache-heavy agent loops where $0.20 cache reads change the unit economics缓存密集型 Agent 链路：$0.20 缓存读取能改变单任务成本
✕ Not Ideal For不适合以下场景
- Pipelines that require thinking to be switched off — it cannot be disabled here必须关闭思考模式的管线——这里关不掉
- High-volume routine work — Sonnet 5.5 is cheaper and faster for that大批量常规工作——Sonnet 5.5 更便宜更快
- The most demanding reasoning tasks — Anthropic reserves those for Fable 5.1最苛刻的推理任务——Anthropic 把那档留给了 Fable 5.1
Getting Started with Claude Opus 5.5Claude Opus 5.5 快速开始
1. Call model ID claude-opus-5-5 on the Claude API, Bedrock, Vertex AI or Foundry — same ID across platforms调模型认准 ID：claude-opus-5-5，Claude API、Bedrock、Vertex AI、Foundry 通用2. Start at default medium effort; only raise to high where traces show the task needs it先跑默认 medium 档；trace 证明任务确实需要时再升 high 档3. Use prompt caching aggressively ($0.20 reads) and the 50%-off Batch API for offline work — prices per official site缓存能开尽开（读取 $0.20）、离线任务走 5 折 Batch API；价格以官网为准Key Features核心功能
- 1M-Token Context100 万上下文 — 1M-token context window with up to 128K output tokens (300K on the Batch API) for whole repos and long agent runs.100 万上下文、最高 128K 输出（Batch API 300K），整库与长程 Agent 链路一次吃下。
- $4/$20 Pricing, 20% Below Opus 5$4/$20 定价、比 Opus 5 低 20% — $4 input / $20 output per MTok (Opus 5: $5/$25); cache reads $0.20 (down 60%); Batch API 50% off. Prices per official site.$4 输入/$20 输出每百万 token（Opus 5 为 $5/$25）；缓存读取 $0.20（降 60%）；Batch API 5 折。价格以官网为准。
- Adaptive Thinking, Effort Control自适应思考、努力档控制 — Thinking is always on and adaptive; steer it with low/medium/high effort (default medium) instead of a thinking toggle.思考常开且自适应；用 low/medium/high 努力档调节（默认 medium），不再有思考开关。
- Fast Mode (Research Preview)Fast 模式（研究预览） — Up to 2.5x output speed at $8/$40 per MTok in Claude Code and the Claude Platform — optional, not the default.Claude Code 与 Claude Platform 里可快至 2.5 倍，$8/$40 每百万 token——可选附加，不是默认价。
- Long-Horizon Agentic Work长程 Agent 工作 — Built for long-running agentic coding, computer use and professional knowledge work, with fewer tokens and steps per task (vendor claim).为长程 Agent 编程、计算机操作与专业知识工作而生，每任务 token 与步骤更少（厂商口径）。
Pros & Cons优缺点
✓ Pros优点
- 20% cheaper per token than Opus 5, with 60% cheaper cache reads比 Opus 5 每 token 便宜 20%，缓存读取便宜 60%
- Output more than 30% faster than Opus 5 (vendor claim)输出比 Opus 5 快 30%+（厂商口径）
- 1M context and 128K output for long agent runs100 万上下文、128K 输出，撑得起长程 Agent 链路
- Same model ID across Claude API, AWS, Google Cloud and MicrosoftClaude API、AWS、谷歌云、微软通用同一模型 ID
✕ Cons缺点
- Thinking cannot be switched off — four Opus 5 integrations break (per launch coverage)思考关不掉——据发布报道，四类 Opus 5 集成会报错
- 40% saving is measured at default effort; max-effort runs cost more省 40% 按默认档测算；max 档跑起来更贵
- Still pricier and slower than Sonnet 5.5 for routine volume常规大批量场景仍比 Sonnet 5.5 贵且慢
Use Cases应用场景
Popular ways people use Claude Opus 5.5.人们使用 Claude Opus 5.5 的常见场景：
💻 Agentic Coding at Scale规模化 Agent 编程
Long-running coding agents that read repos, plan, edit and verify — the model's stated home turf, now at $4/$20 (prices per official site).读库、规划、改代码、验证的长程编程 Agent——该模型的主场，现价 $4/$20（价格以官网为准）。
📚 Knowledge Work on Large Corpora大语料知识工作
1M context fits whole document sets for research, review and synthesis in one pass.100 万上下文一次装下整套文档，做研究、审阅与综合。
🔄 Opus 5 MigrationOpus 5 迁移
Drop-in tier replacement: same Opus role, lower rate card — re-benchmark at medium effort first.同档原位替换：还是 Opus 的活，价目表更低——先在 medium 档重测。
⚡ Latency-Sensitive Agent Loops时延敏感的 Agent 链路
Fast mode (research preview, $8/$40) trades price for up to 2.5x output speed where latency is the bottleneck.Fast 模式（研究预览，$8/$40）用价格换最高 2.5 倍输出速度，适合时延是瓶颈的链路。
Similar AI Tools相似 AI 工具
If Claude Opus 5.5 doesn't fit your needs, here are other popular AI tools you might consider — the wider family is covered at Claude, the cheaper sibling tier at Claude Sonnet 5.5, and an open-weight coding alternative at DeepSeek.如果 Claude Opus 5.5 不符合你的需求，可以看看这些热门 AI 工具——全家概览见 Claude，更便宜的同辈档见 Claude Sonnet 5.5，开权重编程替代见 DeepSeek。