快速结论

  • 面向复杂、长链路编码任务,适合高价值开发工作与工程协作场景。
  • 在严格约束下具备较强指令遵循与结果一致性能力,适合规范化交付流程。
  • 支持视觉理解、工具调用与流式输出,可用于多模态工程工作流。

关键参数

  • model | string | 必填 | claude-opus-4-8 | - | 模型名称,使用当前页面模型 ID(例如 claude-opus-4-8)。
  • messages | object[] | 必填 | - | - | 对话消息列表,按时间顺序排列;仅支持 user 和 assistant 角色。
  • max_tokens | integer | 必填 | - | >=1 | 生成内容的最大 token 数量。
  • system | string | object[] | 可选 | - | - | 系统提示词,在顶层设置(不要放在 messages 中)。
  • stream | boolean | 可选 | false | - | 是否启用流式输出(SSE)。
  • temperature | number | 可选 | 1 | 0-1 | 采样温度,控制输出随机性。
  • top_p | number | 可选 | - | 0-1 | 核采样概率阈值,建议不要同时设置 temperature 和 top_p。
  • stop_sequences | string[] | 可选 | - | - | 停止序列,遇到指定字符串时停止生成。
  • Authorization | HTTP Header | 可选 | - | - | Bearer Token 认证:Authorization: Bearer <YOUR_API_KEY>。
  • x-api-key | HTTP Header | 可选 | - | - | API Key 认证(Anthropic SDK 常用),与 Authorization 二选一。
  • anthropic-version | HTTP Header | 可选 | 2023-06-01 | - | Anthropic API 版本号;使用 Anthropic SDK 时通常自动传入。

常见错误

  • 400 invalid_request_error: 触发=请求体字段缺失、messages 结构错误或参数类型不匹配。; 修复=重点校验 model、messages、max_tokens 字段及类型。; 重试=修正参数后再重试。
  • 401 authentication_error: 触发=Authorization 缺失、格式错误或密钥无效。; 修复=确认 Bearer Token 与密钥权限。; 重试=修复鉴权后重试。
  • 429 rate_limit_exceeded: 触发=请求频率、并发或当前额度命中上游限流策略。; 修复=先做指数退避重试,并检查当前请求节奏、并发设置和额度使用情况。; 重试=建议 1s/2s/4s + 抖动;连续触发时再收紧提交节奏。
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Claude Opus 4.8

Use Anthropic's flagship model for complex reasoning, long-running agent coding, and high-autonomy workflows through one OpenAI-compatible ToAPIs endpoint.

1M context workflows
Agentic coding
Adaptive thinking
128K max output
查看 API 文档

新用户可获得 10 credits。无需信用卡。

Claude Opus 4.8 official hero visual
Flagship reasoning for long-context agent work

1M

Default context on API, Bedrock, and Vertex AI

128K

Maximum output tokens

88.6%

SWE-bench Verified reference

2.5x

Approximate fast-mode speedup

Try Claude Opus 4.8 with one ToAPIs key.

Route Claude Opus 4.8 alongside GPT, Gemini, image, and video models without maintaining separate provider integrations.

Sign up to get free credits
输入消息开始测试模型。

Claude Opus 4.8 token pricing

Current ToAPIs text pricing is shown directly from the production pricing rule: input and output are billed by token usage.

Token-based
充值 credits

Input

70%

ToAPIs 价格

$1.5

300 积分 / 1M tokens

Official reference

$5

/ 1M tokens

Output

70%

ToAPIs 价格

$7.5

1,500 积分 / 1M tokens

Official reference

$25

/ 1M tokens

Final billing follows the current account pricing and actual token usage.

Why call Claude Opus 4.8 through ToAPIs?

Keep Claude available for high-value reasoning while preserving one API surface, one account, and one routing layer.

One OpenAI-compatible surface

Use the same request style across Claude, GPT, Gemini, and multimodal models.

Route expensive reasoning

Reserve Opus 4.8 for complex planning, code review, and long-context work, then route routine tasks elsewhere.

Production budget control

Track usage across model families and build fallback rules around latency and cost.

Integrate Claude Opus 4.8 in three steps

Use the same token, dashboard, and playground workflow as the rest of your ToAPIs models.

  1. 1

    Select the model ID

    Use claude-opus-4-8 in your chat completion workflow.

  2. 2

    Set reasoning budget

    Start with high-effort reasoning for complex tasks, then tune temperature and output length from the Playground.

  3. 3

    Add fallbacks

    Pair Opus 4.8 with faster or cheaper models for bulk traffic and latency-sensitive paths.

Best-fit Claude Opus 4.8 workloads

Large-codebase agents

Plan migrations, reason across repositories, and keep long engineering context active.

High-stakes analysis

Use the long context window for dense documents, decision memos, and structured knowledge work.

Autonomous tool workflows

Support multi-step tasks where planning quality matters more than the cheapest token path.

Claude Opus 4.8 API FAQ

What is Claude Opus 4.8 best for?

It is best positioned for complex reasoning, long-context coding, agent planning, and knowledge work where quality matters more than raw cost.

Does this page support live chat testing?

Yes. The in-page chat panel reuses the same Playground chat flow and request structure, then routes logged-in users through ToAPIs.

How should I control Opus 4.8 cost?

Use it for high-value reasoning and add fallback rules for routine summarization, lightweight chat, or bulk background jobs.

Claude Opus 4.8 API

Build with Claude Opus 4.8 through ToAPIs

Create a key, test a high-effort prompt, and add Claude Opus 4.8 to your production routing plan.