What Is Claude Sonnet 5.5?Claude Sonnet 5.5 是什么？
Claude Sonnet 5.5 is the balanced workhorse of the Claude 5.5 family, released on September 28, 2026 — sitting between the budget-friendly Claude Haiku 5.5 and the flagship Claude Opus 5.5 (released a week earlier). Anthropic positions it for well-scoped everyday work: code debugging, document creation, slides and spreadsheets. It generates output 30%+ faster than Sonnet 5 and, in Anthropic's testing, costs up to 30% less per task — while the API rates stay flat. The headline feature, though, is safety: Sonnet 5.5's cybersecurity capabilities are comparable to Opus 5's, making it the first Sonnet to launch with the cyber safeguards and fallback protections previously reserved for Anthropic's most capable models — plus the first Sonnet with safety classifiers that block distillation attacks.Claude Sonnet 5.5 是 Anthropic 2026 年 9 月 28 日发布的 Claude 5.5 家族均衡主力，介于平价的 Claude Haiku 5.5 与旗舰 Claude Opus 5.5（早一周发布）之间。定位是边界清晰的日常工作：代码调试、文档创作、幻灯片和电子表格。官方称输出比 Sonnet 5 快 30%+，单任务成本降最高 30%——而 API 费率纹丝不动。但真正的 headline 是安全：Sonnet 5.5 的网络安全能力对标上代 Opus 旗舰，是首个搭载 Opus 级网络防护与回退保护的 Sonnet，也是首个带防蒸馏攻击安全分类器的 Sonnet。
API pricing is unchanged from Sonnet 5: $2 input / $10 output per million tokens, with cache reads at $0.20 and cache writes at $2.50 per MTok ($1/$5 via the Batch API). The saving comes from token efficiency, not rate cuts — it typically needs far fewer tokens to do the same work. Prices are per the official site.API 定价 $2 输入 / $10 输出每百万 token，与 Sonnet 5 完全一致；缓存读取 $0.20、写入 $2.50（Batch API $1/$5）。省钱靠的是 token 效率，不是降费率——干同样的活通常少用很多 token。价格以官网为准。
Sonnet 5.5 is the most interesting mid-tier release of 2026 because the story isn't capability — it's Anthropic moving Opus-grade cyber safeguards downmarket. Cybersecurity comparable to Opus 5, visible fallback behavior, anti-distillation classifiers, preserved thinking tied to the account: this is a model designed to be deployed at scale without the frontier-safety tax. The benchmarks back the positioning: 70.6% on Terminal-Bench 4.0 (vs 10.3% for Sonnet 5, and even ahead of Opus 5.5's 66.4%), 1844 on GDPval-AA — within a couple of points of the flagship at half the token price. The honest caveat: "up to 30% less per task" is an Anthropic claim about token efficiency, and independent testers have measured it using more tokens than other models on some workloads — your mileage depends on your task mix. Verdict: the default choice for everyday coding agents and document work in 2026; Opus 5.5 only earns its premium on genuinely complex judgment calls.
Sonnet 5.5 是 2026 年最有意思的中端发布，因为故事不在能力——在 Anthropic 把 Opus 级网络安全防护下放。网络安全对标 Opus 5、可见的回退行为、防蒸馏分类器、推理与账号绑定的 preserved thinking：这是为规模化部署而生、不用交前沿安全税的模型。基准也支撑这个定位：Terminal-Bench 4.0 70.6%（Sonnet 5 只有 10.3%，甚至超过 Opus 5.5 的 66.4%），GDPval-AA 1844——以旗舰一半的 token 价格，咬住旗舰几分之内。真实代价：「单任务便宜最高 30%」是 Anthropic 的 token 效率说法，第三方实测在某些负载下它用的 token 比别的模型还多——省不省钱看你的任务组合。结论：2026 年日常编程 Agent 和文档工作的默认之选；只有真正复杂的判断型任务才值得上 Opus 5.5。
— 中国吧 AI Tools Hub Editorial Team
Who Should Use Claude Sonnet 5.5?谁适合使用Claude Sonnet 5.5？
✓ Good Fit For适合以下场景
- Everyday coding agents — the 2026 default at $2/$10日常编程 Agent——2026 年的默认之选，$2/$10
- Teams needing Opus-grade cyber safeguards at mid-tier price需要 Opus 级网络防护、但按中端价格付费的团队
- Documents, slides, spreadsheets with strong agentic quality文档、幻灯片、电子表格，需要强 Agent 质量
✕ Not Ideal For不适合以下场景
- Offensive or gray-zone security research — expect visible fallbacks to Sonnet 5进攻性/灰色地带安全研究——会被可见地回退到 Sonnet 5
- Complex judgment calls where Opus 5.5's reasoning depth earns its premium需要复杂判断的任务——Opus 5.5 的推理深度才值回票价
Getting Started with Claude Sonnet 5.5Claude Sonnet 5.5 快速开始
1. Use model ID claude-sonnet-5-5 on the Claude API, Amazon Bedrock, Google Cloud or Microsoft Azure (zero data retention); also GA in GitHub Copilot在 Claude API、Amazon Bedrock、Google Cloud、Microsoft Azure 用模型 ID claude-sonnet-5-5（零数据留存）；GitHub Copilot 已 GA2. Budget $2 input / $10 output per MTok, cache reads $0.20 — prices per official site按 $2 输入 / $10 输出每百万 token 做预算，缓存读取 $0.20——价格以官网为准3. Migrating from Sonnet 5 with thinking disabled? Switch to the new between_tools setting; expect increased refusals on higher-risk security requests从 Sonnet 5（thinking 关闭）迁移？改用新的 between_tools 设置；高风险安全请求要接受更高的拒绝率Key Features核心功能
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Opus-Grade Cyber SafeguardsOpus 级网络安全防护 — Cybersecurity capabilities comparable to Opus 5's — the first Sonnet to ship with the cyber safeguards and fallback protections reserved for Anthropic's most capable models. Higher-risk requests visibly fall back to Sonnet 5.网络安全能力对标 Opus 5——首个搭载 Opus 级网络防护与回退保护的 Sonnet。高风险请求会被可见地回退到 Sonnet 5。
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Anti-Distillation Classifiers防蒸馏攻击分类器 — The first Sonnet with safety classifiers that block reasoning-extraction attempts used in distillation attacks, plus preserved-thinking protections tied to the creating account.首个带防蒸馏攻击安全分类器的 Sonnet：拦截规模化提取模型推理的尝试，推理与创建账号绑定保护。
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30%+ Faster, Up to 30% Cheaper Per Task快 30%+，单任务便宜最高 30% — Output generates 30%+ faster than Sonnet 5; far fewer tokens per task in Anthropic's testing — while rates stay flat at $2/$10 per MTok. Prices per official site.比 Sonnet 5 输出快 30%+；官方测试中单任务少用很多 token——费率保持 $2/$10 不变。价格以官网为准。
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Near-Opus Benchmarks接近 Opus 的基准分数 — Anthropic-reported Terminal-Bench 4.0 70.6% (Sonnet 5: 10.3%, Opus 5.5: 66.4%), GDPval-AA v2.1 1844, AA-Briefcase v1.1 1811, CursorBench 4.0 55.5% — within a couple of points of Opus 5.5 on several tests at half the token price.官方报告 Terminal-Bench 4.0 70.6%（Sonnet 5 10.3%，Opus 5.5 66.4%）、GDPval-AA v2.1 1844、AA-Briefcase v1.1 1811、CursorBench 4.0 55.5%——多项测试咬住 Opus 5.5 几分之内，token 价格只有一半。
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1M Context, 128K Output100 万上下文、12.8 万输出 — 1M-token context window with up to 128K output tokens, available on the Claude platform, AWS, Google Cloud and Microsoft Azure.100 万上下文、输出最高 12.8 万，Claude 平台、AWS、Google Cloud、Microsoft Azure 全渠道可用。
Pros & Cons优缺点
✓ Good Fit For适合以下场景
- Near-Opus benchmarks at half the token price ($2/$10 vs $4/$20)接近 Opus 的基准，token 价格只有一半（$2/$10 对 $4/$20）
- First Sonnet with Opus-grade cyber safeguards + anti-distillation classifiers首个带 Opus 级网络防护 + 防蒸馏分类器的 Sonnet
- 30%+ faster output, up to 30% cheaper per task in vendor testing输出快 30%+，官方测试单任务便宜最高 30%
- GA in GitHub Copilot on day one — enterprise reach发布当天即 GA 进 GitHub Copilot，企业覆盖直接拉满
✕ Not Ideal For不适合以下场景
- Rates unchanged — no headline price cut, savings depend on your workload费率没降——没有 headline 降价，省不省钱看你的负载
- Increased refusals on higher-risk security work by design高风险安全工作拒绝率上升，是设计使然
- Independent testers measured higher token usage on some workloads第三方实测部分负载下 token 消耗更高
Use Cases应用场景
Popular ways people use Claude Sonnet 5.5.人们使用Claude Sonnet 5.5的常见场景：
💻 Coding Agents编程 Agent
Terminal-Bench 4.0 70.6% makes it the 2026 default for everyday coding agents — debugging, refactors, repo-wide edits at $2/$10 per MTok.Terminal-Bench 4.0 70.6%，是 2026 年日常编程 Agent 的默认之选——调试、重构、仓库级编辑，$2/$10 每百万 token。
📄 Documents, Slides, Spreadsheets文档、幻灯片、电子表格
AA-Briefcase v1.1 1811 and GDPval-AA v2.1 1844 — polished office output with strong agentic quality.AA-Briefcase v1.1 1811、GDPval-AA v2.1 1844——高质量的办公产出，Agent 质量强。
🛡️ Defensive Security Work防御性安全工作
Opus-comparable cyber capabilities with fallback protections — verified defenders can apply for tiered access via the Cyber Verification Program.对标 Opus 的网络安全能力 + 回退保护——经验证的防御者可申请 Cyber Verification Program 分级访问。
🏢 Enterprise Copilot Workflows企业 Copilot 工作流
GA in GitHub Copilot on launch day for Pro/Pro+/Max/Business/Enterprise — zero data retention on API platforms.发布当天即 GA 进 GitHub Copilot（Pro/Pro+/Max/企业版），API 平台零数据留存。
Similar AI Tools相似 AI 工具
If Claude Sonnet 5.5 doesn't fit your needs, here are other popular AI tools you might consider — including the rest of the family: Claude and Claude Haiku 5.5 (see our full reviews).如果Claude Sonnet 5.5不符合你的需求，可以看看这些热门 AI 工具——包括同家族的 Claude 和 Claude Haiku 5.5（见本站完整评测）。