claude-fable-5Claude Fable 5 is Anthropic's latest and most capable publicly available model — and on API Models it costs about 50% less than official Anthropic pricing ($5 input / $25 output per 1M tokens). Ultra-long context, multimodal (vision) understanding, complex reasoning and enterprise-grade knowledge work, with strict safety safeguards. 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.
About half the official Anthropic price
Handles very large inputs end to end
Text + image (vision) comprehension
Strong multi-step reasoning and analysis
View complete API reference with all parameters and examples.
Enable real-time streaming responses with Server-Sent Events.
{
"model": "claude-fable-5",
"stream": true,
"max_tokens": 1024,
"messages": [...]
}Enable Claude to use tools and call functions.
{
"model": "claude-fable-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-fable-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-fable-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-fable-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-fable-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 Fable 5 is a Large Language Model API provided by Anthropic. Anthropic の最新かつ最も高性能な一般公開 LLM。公式より約50%安価。Anthropic API 経由で Claude Code や Cursor で利用可能。超長コンテキスト、マルチモーダル、複雑な推論、厳格な安全性。 Through API Models platform, you can access this model via a unified API with transparent pay-as-you-go pricing. Current pricing: Input: $5, Output: $25 per 1M tokens.
Build intelligent conversational systems to automatically answer user queries and improve service efficiency.
Automatically write articles, emails, ad copy, and other text content to boost productivity.
Assist with code writing, debugging, and code review to accelerate software development.
Understand and analyze unstructured data, extract key insights, and generate summary reports.
Claude Fable 5 is available through API Models at: Input: $5, Output: $25 per 1M tokens. Billing is pay-as-you-go — you only pay for what you generate.
Sign up at API Models, get your API key, and call our unified API endpoint. We provide detailed API documentation with code examples in cURL, Python, and Node.js.
API Models offers the same Claude Fable 5 model through our aggregation platform. We provide a unified API interface so you do not need separate accounts for each provider - one API key to access all models.
Claude Fable 5 は Anthropic の最新かつ最も高性能な一般公開 LLM です。超長コンテキスト、マルチモーダル（画像理解）、複雑な推論、エンタープライズ品質のナレッジワークに対応し、厳格な安全対策も備えています。長文ドキュメントや画像の処理、複雑な多段階推論、エージェント型コーディング、高品質なナレッジワークに最適です。apimodels.app では入力 $5 / 出力 $25（1M トークンあたり）で、公式価格の約半額です。
はい。Fable 5 は Anthropic Messages API（/v1/messages）を通じてネイティブなツール利用（tool_use）に対応しています。これは Claude Code や Anthropic SDK が使う形式です。ANTHROPIC_BASE_URL を https://apimodels.app/api/v1 に向け、モデル名を claude-fable-5 に設定し、apimodels の API Key を指定するだけです（詳しくは /docs/claude-code）。Cursor など Anthropic API 互換のクライアントも、「カスタム Anthropic モデル」として設定すれば利用できます。ツールは Anthropic 形式（{name, input_schema}）で送信してください。リクエストパラメータは Claude Opus 4.8 と完全に同じです。
Anthropic Messages API（/v1/messages）経由で呼び出します。ツール呼び出し（tool_use）と画像入力（vision）をネイティブに対応しており、これは Claude Code や Anthropic SDK と同じ仕組みです。リクエストパラメータは Claude Opus 4.8 と完全に同じで、モデル名を claude-fable-5 に変えるだけで使えます。
入力 $5 / 出力 $25（1M トークンあたり）で、Anthropic 公式価格の約半額（約50%オフ）です。プロンプトキャッシュにも対応しており、キャッシュ読み取り（ヒット）は $0.5/M と入力単価を大きく下回り、キャッシュ書き込みは $9/M です。繰り返し登場するコンテキストが多い長い会話に最適です。
Fable 5 は Anthropic 最新のフラッグシップで、総合性能が最も高く、マルチモーダルも優れており、apimodels.app では $5/$25（公式価格の約半額）です。Opus 4.8 はより成熟しており、トークン単価も安く（$3/$13）、長時間にわたるエージェント型タスクでも依然として優秀です。最新・最高性能を求めるなら claude-fable-5、トークン単価の安さを求めるなら claude-opus-4-8 を選んでください。どちらも同じ API Key を共有するので、タスクに応じて使い分けられます。
On API Models, Claude Fable 5 runs alongside 60+ models on one API key and one balance, so choosing is about fit, not lock-in. It supports Ultra-Long Context、Multimodal、Complex Reasoning、~50% Cheaper, and you can weigh it on price and capability against other Large Language Model models, then switch by changing a single model-name string — no new account or integration. Browse every Large Language Model option with live pricing at apimodels.app/models.
Claude Fable 5 supports: Ultra-Long Context、Multimodal、Complex Reasoning、~50% Cheaper. See the API Models docs for full parameters and call examples.
Yes. API Models exposes Claude Fable 5 through a single unified API and one key — no separate provider accounts, and no need to handle each provider's regional network access yourself.
We support Stripe (Visa, Mastercard, and other international cards) and Alipay. Credits are available instantly after payment.