claude-sonnet-5Claude Sonnet 5 is Anthropic's newest Sonnet — a 1M-token context window (both the default and the maximum; there is no smaller-context variant), up to 128K output tokens, adaptive thinking, and the same tools and platform features as Claude Sonnet 4.6 (Priority Tier is the one exception — Sonnet 5 does not support it). On APIMODELS it's $2.353 input / $11.765 output per 1M tokens (22% below official), with prompt caching support (cache reads at $0.147/M, cache writes at $2.059/M). Note that billed output tokens include the model's internal thinking tokens, matching Anthropic's own billing. Use it through the Anthropic Messages API (/v1/messages) — the native path for Claude Code, the Anthropic SDK, and Anthropic-compatible clients like Cursor — with native tool use (function calling). Request params match Claude Opus 4.8.
Default and maximum — no smaller variant
Extended reasoning when the task needs it
Long, complete responses in one call
Native tool use via the Anthropic Messages API
View complete API reference with all parameters and examples.
Enable real-time streaming responses with Server-Sent Events.
{
"model": "claude-sonnet-5",
"stream": true,
"max_tokens": 1024,
"messages": [...]
}Enable Claude to use tools and call functions.
{
"model": "claude-sonnet-5",
"max_tokens": 1024,
"tools": [{
"name": "get_weather",
"description": "Get current weather for a location",
"input_schema": {
"type": "object",
"properties": {
"location": {"type": "string", "description": "City name"}
},
"required": ["location"]
}
}],
"tool_choice": {"type": "auto"},
"messages": [{"role": "user", "content": "What's the weather in Tokyo?"}]
}Analyze PDF documents by sending them as base64 encoded content.
{
"model": "claude-sonnet-5",
"max_tokens": 1024,
"messages": [{
"role": "user",
"content": [{
"type": "document",
"source": {
"type": "base64",
"media_type": "application/pdf",
"data": "<base64_encoded_pdf>"
}
}, {
"type": "text",
"text": "Summarize this document."
}]
}]
}Get structured JSON responses that match your schema.
{
"model": "claude-sonnet-5",
"max_tokens": 1024,
"output_format": {
"type": "json_schema",
"schema": {
"type": "object",
"properties": {
"name": {"type": "string"},
"age": {"type": "integer"}
},
"required": ["name", "age"]
}
},
"messages": [{"role": "user", "content": "Extract info: John is 30 years old"}]
}Enable Claude to search the web for up-to-date information.
{
"model": "claude-sonnet-5",
"max_tokens": 1024,
"tools": [{
"type": "web_search_20250305",
"name": "web_search",
"max_uses": 5
}],
"messages": [{"role": "user", "content": "What's the latest news about AI?"}]
}| Parameter | Type | Required | Description |
|---|---|---|---|
| model | string | Yes | Model identifier (e.g., claude-sonnet-5) |
| messages | array | Yes | Array of message objects with role and content |
| max_tokens | integer | Yes | Maximum tokens in the response (1 - 128000) |
| system | string | No | System prompt to set context |
| stream | boolean | No | Enable streaming responses (SSE) |
| temperature | number | No | Sampling temperature (0.0 - 1.0) |
| top_p | number | No | Nucleus sampling threshold (0.0 - 1.0) |
| top_k | integer | No | Top-k sampling (0 - infinity) |
| stop_sequences | array | No | Sequences that stop generation |
| tools | array | No | Function calling tools definition |
| tool_choice | object | No | Tool selection strategy (auto/any/tool) |
| thinking | object | No | Enable extended thinking mode |
| output_format | object | No | Structured output with JSON schema |
View complete API reference with streaming, thinking, and more.
Billing: Cost = (input_tokens * input_price + output_tokens * output_price) / 1,000,000
Claude Sonnet 5 は Anthropic の大規模言語モデル API です。Claude Sonnet 5 is Anthropic's newest Sonnet — a 1M-token context window (both the default and the maximum; there is no smaller-context variant), up to 128K output tokens, adaptive thinking, and the same tools and platform features as Claude Sonnet 4.6 (Priority Tier is the one exception — Sonnet 5 does not support it). On APIMODELS it's $2.353 input / $11.765 output per 1M tokens (22% below official), with prompt caching support (cache reads at $0.147/M, cache writes at $2.059/M). Note that billed output tokens include the model's internal thinking tokens, matching Anthropic's own billing. Use it through the Anthropic Messages API (/v1/messages) — the native path for Claude Code, the Anthropic SDK, and Anthropic-compatible clients like Cursor — with native tool use (function calling). Request params match Claude Opus 4.8. APIMODELS のプラットフォーム経由なら、統一 API と明朗な従量課金でこのモデルを呼び出せます。 現在の料金: Input: $2.353, Output: $11.765 per 1M tokens。
問い合わせに自動で答える対話システムを構築し、対応の効率を上げます。
記事、メール、広告コピーなどの文章を自動で書き、制作の手数を減らします。
コードの記述、デバッグ、レビューを補助し、開発を前に進めます。
非構造化データを読み解き、要点を抽出して要約レポートにまとめます。
Claude Sonnet 5 は APIMODELS 経由で Input: $2.353, Output: $11.765 per 1M tokens で利用できます。課金は従量制で、生成した分だけの支払いです。
APIMODELS に登録して API キーを取得し、統一エンドポイントを呼ぶだけです。cURL / Python / Node.js のサンプルを含む詳しいドキュメントを用意しています。
APIMODELS は同じ Claude Sonnet 5 を集約プラットフォーム経由で提供します。統一された API インターフェースなので、プロバイダごとにアカウントを作る必要はありません。キー 1 本ですべてのモデルに届きます。
Claude Sonnet 5 is Anthropic's newest Sonnet model: a 1M-token context window (both default and maximum — there's no smaller-context variant), up to 128K output tokens, adaptive thinking, and the same tools and platform features as Claude Sonnet 4.6, with one exception — it does not support Priority Tier. On apimodels.app it's $2.353 input / $11.765 output per 1M tokens (22% below official pricing), balancing capability with a low price.
Yes — Sonnet 5 supports native tool use (function calling) through the Anthropic Messages API (/v1/messages), the format Claude Code and the Anthropic SDK use. Point ANTHROPIC_BASE_URL at https://api.apimodels.app/v1, set the model to claude-sonnet-5, and use your apimodels API key (see /docs/claude-code). Anthropic-API-compatible clients like Cursor work too when configured as a custom Anthropic model. Send tools in Anthropic format ({name, input_schema}); request params are identical to Claude Opus 4.8.
Input $1 / output $4.5 per 1M tokens. Prompt caching is supported: cache-read (hit) tokens are billed at just $0.1/M — a tenth of the input rate — and cache writes at $2/M. The 1M-token context plus caching makes it ideal for long documents, long sessions, and agentic coding.
Sonnet 5 is the newest Sonnet — 1M context + adaptive thinking at $2.353/$11.765, the best value for most coding/chat/long-document work. Sonnet 4.6 is the previous Sonnet; Opus 4.8 ($3/$13) is for the hardest long-horizon agentic reasoning. Pick claude-sonnet-5 for the newest, cheapest, still-strong option — all share one API key so you can switch by task.
APIMODELS では Claude Sonnet 5 が 60 以上のモデルと同じ API キー・同じ残高の上に並んでいるので、選択は「相性」の問題であって「囲い込み」の問題ではありません。1M Context、Adaptive Thinking、128K Output、Tool Calling に対応しており、他の大規模言語モデルモデルと価格・機能を並べて評価できます。乗り換えはモデル名の文字列を 1 つ書き換えるだけ。新しいアカウントも追加の実装も要りません。大規模言語モデルの選択肢と最新価格は apimodels.app/models で確認できます。
Claude Sonnet 5 は次に対応しています: 1M Context、Adaptive Thinking、128K Output、Tool Calling。パラメータの全一覧と呼び出し例は APIMODELS のドキュメントをご覧ください。
はい。APIMODELS は Claude Sonnet 5 を単一の統一 API とキー 1 本で提供します。プロバイダごとのアカウントも、各社の地域ごとのネットワーク経路を自分で面倒みる必要もありません。
Stripe（Visa、Mastercard などの国際カード）と Alipay に対応しています。支払い後、残高はすぐ反映されます。
How to get access, regional availability, and how this model compares with its alternatives.