---
title: Claude Sonnet 4.5
url: https://platform.claude.com/docs/ko/models/sonnet-4-5/overview
description: "Claude Sonnet 4.5 참조: 수명 주기 상태, 모든 플랫폼의 모델 ID, 컨텍스트 윈도우, 출력 한도, 가격 및 마이그레이션 리소스. Claude Sonnet 4.5는 지원 중단된 모델이며, Claude Sonnet 5.5가 현재 Sonnet 모델입니다."
---
**Deprecated.** Released September 29, 2025.
Claude Sonnet 4.5 is deprecated: it is still functional but no longer recommended, and retires on November 30, 2026. Recommended replacement: Claude Sonnet 5.5. [See Claude Sonnet 5.5](https://platform.claude.com/docs/ko/models/sonnet-5-5/overview) · [Migrate to Claude Sonnet 5.5](https://platform.claude.com/docs/ko/models/sonnet-5-5/migration-guide#migrating-from-sonnet-45)
Model ID: `claude-sonnet-4-5-20250929`
Context window: 200K tokens · Max output: 64K tokens · Input pricing: $3 / MTok · Output pricing: $15 / MTok
[Announcement](https://www.anthropic.com/news/claude-sonnet-4-5)
## 현재 라인업과의 비교
| Model | Context | Max output | Price / MTok | Thinking | Default effort | Knowledge cutoff |
| :---------------------------------------------------------------------------------- | :------ | :--------- | :----------------- | :------------------- | :------------- | :--------------- |
| [Claude Fable 5.1](https://platform.claude.com/docs/ko/models/fable-5-1/overview) | 1M | 128K | $10 / $50 | Adaptive (always on) | `high` | Jun 2026 |
| [Claude Opus 5.5](https://platform.claude.com/docs/ko/models/opus-5-5/overview) | 1M | 128K | $4 / $20 | Adaptive (always on) | `medium` | Jun 2026 |
| [Claude Sonnet 5.5](https://platform.claude.com/docs/ko/models/sonnet-5-5/overview) | 1M | 128K | $2 / $10 | Adaptive | `high` | Jun 2026 |
| **Claude Sonnet 4.5** (this model) | 200K | 64K | $3 / $15 | Extended | — | Jan 2025 |
| [Claude Haiku 5.5](https://platform.claude.com/docs/ko/models/haiku-5-5/overview) | 1M | 128K | From $0.10 / $0.50 | Adaptive | `medium` | Jun 2026 |
* **Context:** 1M tokens is roughly 555k words or 2.5M Unicode characters on the current tokenizer (introduced with Claude Opus 4.7); models before it fit about 750k words in 1M tokens. 200k tokens is roughly 150k words.
* **Max output:** Synchronous Messages API limit. On the Message Batches API, Claude Opus 5.5, Claude Opus 5, Claude Sonnet 5.5, Claude Sonnet 5, Claude Haiku 5.5, Claude Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, and Claude Sonnet 4.6 support up to 300k output tokens with the output-300k-2026-03-24 beta header.
* **Price / MTok:** Input / output, base price per million tokens. Batch API requests are 50% off; prompt caching reads cost 10% of the base input price (2.5% on Claude Fable 5.1 and Claude Mythos 5.1, 5% on Claude Opus 5.5 and Claude Sonnet 5.5). See Pricing for the full list.
* **Thinking:** Adaptive thinking lets the model decide how much to think, steered by effort. Extended thinking is the manual budget\_tokens mode on earlier models.
* **Default effort:** The effort parameter’s default on the Claude API. Models without a value don’t support the parameter.
* **Knowledge cutoff:** Reliable knowledge cutoff: the date through which the model’s knowledge is most extensive and reliable.
## 사양
### Model IDs
| Platform | Model ID |
| :-------------------------------------------------------------------------------------------------------------------- | :------------------------------------------ |
| Claude API | `claude-sonnet-4-5-20250929` |
| Claude API alias | `claude-sonnet-4-5` |
| [Amazon Bedrock (InvokeModel)](https://platform.claude.com/docs/ko/build-with-claude/claude-on-amazon-bedrock-legacy) | `anthropic.claude-sonnet-4-5-20250929-v1:0` |
| [Google Cloud](https://platform.claude.com/docs/ko/build-with-claude/claude-on-vertex-ai) | `claude-sonnet-4-5@20250929` |
| [Microsoft Foundry](https://platform.claude.com/docs/ko/build-with-claude/claude-in-microsoft-foundry) | `claude-sonnet-4-5` |
| [Claude Platform on AWS](https://platform.claude.com/docs/ko/build-with-claude/claude-platform-on-aws) | `claude-sonnet-4-5` |
### Pricing
| Feature | Value |
| :------------------------------------------------------------------------------------- | :------------------------------- |
| Input | $3 / MTok |
| Output | $15 / MTok |
| [5m cache write](https://platform.claude.com/docs/ko/build-with-claude/prompt-caching) | $3.75 / MTok |
| [1h cache write](https://platform.claude.com/docs/ko/build-with-claude/prompt-caching) | $6 / MTok |
| [Cache read](https://platform.claude.com/docs/ko/build-with-claude/prompt-caching) | $0.30 / MTok |
| [Batch API](https://platform.claude.com/docs/ko/build-with-claude/batch-processing) | 50% discount on input and output |
[Full price list](https://platform.claude.com/docs/ko/about-claude/pricing)
### Capabilities
| Feature | Value |
| :-------------------------------------------------------------------------------------- | :--------------------- |
| [Context window](https://platform.claude.com/docs/ko/build-with-claude/context-windows) | 200K tokens |
| Max output | 64K tokens |
| [Thinking](https://platform.claude.com/docs/ko/build-with-claude/thinking) | Extended |
| [Default effort](https://platform.claude.com/docs/ko/build-with-claude/effort) | Not supported |
| Input → output | Text and images → text |
| Reliable knowledge cutoff | Jan 2025 |
| Training data cutoff | Jul 2025 |
### Availability
| Feature | Value |
| :---------------------------------------------------------------------------- | :------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| [Status](https://platform.claude.com/docs/ko/about-claude/model-deprecations) | Deprecated |
| Released | September 29, 2025 |
| Deprecated | September 30, 2026 |
| Retires | November 30, 2026 |
| Platforms | Claude API, [Amazon Bedrock (InvokeModel)](https://platform.claude.com/docs/ko/build-with-claude/claude-on-amazon-bedrock-legacy), [Google Cloud](https://platform.claude.com/docs/ko/build-with-claude/claude-on-vertex-ai), [Microsoft Foundry](https://platform.claude.com/docs/ko/build-with-claude/claude-in-microsoft-foundry), [Claude Platform on AWS](https://platform.claude.com/docs/ko/build-with-claude/claude-platform-on-aws) |
## 리소스
Claude Sonnet 4.5 및 이전 Sonnet 모델에서 Claude Sonnet 5.5로 전환할 때 달라지는 사항입니다.
현재 Sonnet 모델: 개요, 사양 및 리소스입니다.
## 참조
Claude Sonnet 4.5가 claude.ai 및 Claude 앱에서 사용하는 시스템 프롬프트.
Claude Sonnet 4.5의 안전성 평가 및 배포 결정.
배치 할인 및 프롬프트 캐싱 요금을 포함한 전체 가격표.
모델 ID, 별칭 및 고정 스냅샷의 작동 방식.
모든 Claude 모델의 수명 주기 상태 및 종료 약정.
Claude Sonnet 4.5는 InvokeModel Bedrock 통합 및 Bedrock 스타일 모델 ID를 사용합니다.