---
title: Claude Sonnet 4.5
url: https://platform.claude.com/docs/fr/models/sonnet-4-5/overview
description: "Référence de Claude Sonnet 4.5 : statut du cycle de vie, identifiants de modèle sur chaque plateforme, fenêtre de contexte, limites de sortie, tarification et ressources de migration. Claude Sonnet 4.5 est un modèle déprécié ; Claude Sonnet 5.5 est le modèle Sonnet actuel."
---
**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/fr/models/sonnet-5-5/overview) · [Migrate to Claude Sonnet 5.5](https://platform.claude.com/docs/fr/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)
## Comparaison avec la gamme actuelle
| Model | Context | Max output | Price / MTok | Thinking | Default effort | Knowledge cutoff |
| :---------------------------------------------------------------------------------- | :------ | :--------- | :----------------- | :------------------- | :------------- | :--------------- |
| [Claude Fable 5.1](https://platform.claude.com/docs/fr/models/fable-5-1/overview) | 1M | 128K | $10 / $50 | Adaptive (always on) | `high` | Jun 2026 |
| [Claude Opus 5.5](https://platform.claude.com/docs/fr/models/opus-5-5/overview) | 1M | 128K | $4 / $20 | Adaptive (always on) | `medium` | Jun 2026 |
| [Claude Sonnet 5.5](https://platform.claude.com/docs/fr/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/fr/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.
## Spécifications
### 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/fr/build-with-claude/claude-on-amazon-bedrock-legacy) | `anthropic.claude-sonnet-4-5-20250929-v1:0` |
| [Google Cloud](https://platform.claude.com/docs/fr/build-with-claude/claude-on-vertex-ai) | `claude-sonnet-4-5@20250929` |
| [Microsoft Foundry](https://platform.claude.com/docs/fr/build-with-claude/claude-in-microsoft-foundry) | `claude-sonnet-4-5` |
| [Claude Platform on AWS](https://platform.claude.com/docs/fr/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/fr/build-with-claude/prompt-caching) | $3.75 / MTok |
| [1h cache write](https://platform.claude.com/docs/fr/build-with-claude/prompt-caching) | $6 / MTok |
| [Cache read](https://platform.claude.com/docs/fr/build-with-claude/prompt-caching) | $0.30 / MTok |
| [Batch API](https://platform.claude.com/docs/fr/build-with-claude/batch-processing) | 50% discount on input and output |
[Full price list](https://platform.claude.com/docs/fr/about-claude/pricing)
### Capabilities
| Feature | Value |
| :-------------------------------------------------------------------------------------- | :--------------------- |
| [Context window](https://platform.claude.com/docs/fr/build-with-claude/context-windows) | 200K tokens |
| Max output | 64K tokens |
| [Thinking](https://platform.claude.com/docs/fr/build-with-claude/thinking) | Extended |
| [Default effort](https://platform.claude.com/docs/fr/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/fr/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/fr/build-with-claude/claude-on-amazon-bedrock-legacy), [Google Cloud](https://platform.claude.com/docs/fr/build-with-claude/claude-on-vertex-ai), [Microsoft Foundry](https://platform.claude.com/docs/fr/build-with-claude/claude-in-microsoft-foundry), [Claude Platform on AWS](https://platform.claude.com/docs/fr/build-with-claude/claude-platform-on-aws) |
## Ressources
Ce qui change lors du passage de Claude Sonnet 4.5 et des modèles Sonnet antérieurs à Claude Sonnet 5.5.
Le modèle Sonnet actuel : présentation, spécifications et ressources.
## Référence
L'invite système que Claude Sonnet 4.5 utilise sur claude.ai et les applications Claude.
Évaluations de sécurité et décisions de déploiement pour Claude Sonnet 4.5.
Liste complète des prix, y compris les remises par lots et les tarifs de mise en cache des prompts.
Comment fonctionnent les identifiants de modèle, les alias et les instantanés épinglés.
Statut du cycle de vie et engagements de retrait pour chaque modèle Claude.
Claude Sonnet 4.5 utilise l'intégration Bedrock InvokeModel et les identifiants de modèle de style Bedrock.