---
title: Claude Sonnet 5.5
url: https://platform.claude.com/docs/it/models/sonnet-5-5/overview
description: "Claude Sonnet 5.5 in sintesi: a cosa serve, ID del modello su ogni piattaforma, finestra di contesto, limiti di output, prezzi, disponibilità e le guide e risorse per sviluppare con esso."
---
**Latest.** Released September 28, 2026.
The best combination of speed and intelligence
Model ID: `claude-sonnet-5-5`
Context window: 1M tokens · Max output: 128K tokens · Input pricing: $2 / MTok · Output pricing: $10 / MTok
[Announcement](https://www.anthropic.com/claude-sonnet-5-5) · [What’s new](https://platform.claude.com/docs/it/models/sonnet-5-5/whats-new-sonnet-5-5) · [Migration guide](https://platform.claude.com/docs/it/models/sonnet-5-5/migration-guide)
## Panoramica
Claude Sonnet 5.5 offre la migliore combinazione di velocità e intelligenza. Cinque "breaking changes" (modifiche che causano incompatibilità) interessano il codice già in esecuzione su Claude Sonnet 5:
* [Disattiva l'"up-front thinking" (ragionamento anticipato) con `between_tools`](https://platform.claude.com/docs/it/models/sonnet-5-5/whats-new-sonnet-5-5#turn-off-up-front-thinking).
* [Il "forced tool use" (uso forzato degli strumenti) restituisce un errore](https://platform.claude.com/docs/it/models/sonnet-5-5/whats-new-sonnet-5-5#forced-tool-use-is-not-supported).
* [I "thinking blocks" (blocchi di ragionamento) sono legati al modello e alla conversazione](https://platform.claude.com/docs/it/models/sonnet-5-5/whats-new-sonnet-5-5#thinking-blocks-are-tied-to-the-model-that-produced-them).
* [Sull'API Claude e su Google Cloud, il precedente strumento di "computer use" (uso del computer) `computer_20251124` non è accettato](https://platform.claude.com/docs/it/models/sonnet-5-5/whats-new-sonnet-5-5#computer-20251124-is-not-supported).
* [Lo strumento advisor rifiuta Claude Opus 4.8, Claude Opus 4.7, Claude Sonnet 5 e Claude Haiku 5.5 come advisor](https://platform.claude.com/docs/it/models/sonnet-5-5/whats-new-sonnet-5-5#advisor-tool-pairings).
Un'altra modifica altera la forma della risposta senza far fallire alcuna richiesta: [il testo tra le chiamate agli strumenti viene restituito in blocchi `thinking`](https://platform.claude.com/docs/it/models/sonnet-5-5/whats-new-sonnet-5-5#text-between-tool-calls). Un'applicazione che trasmette in streaming quel testo ai propri utenti resta silenziosa tra le chiamate agli strumenti finché non imposta un valore `display` che restituisce il testo, oppure non disattiva il ragionamento anticipato con `between_tools`.
[Novità di Claude Sonnet 5.5](https://platform.claude.com/docs/it/models/sonnet-5-5/whats-new-sonnet-5-5)
## Come si confronta
| Model | Context | Max output | Price / MTok | Latency | Thinking | Default effort | Knowledge cutoff |
| :-------------------------------------------------------------------------------- | :------ | :--------- | :----------------- | :------- | :------------------- | :------------- | :--------------- |
| [Claude Fable 5.1](https://platform.claude.com/docs/it/models/fable-5-1/overview) | 1M | 128K | $10 / $50 | Slower | Adaptive (always on) | `high` | Jun 2026 |
| [Claude Opus 5.5](https://platform.claude.com/docs/it/models/opus-5-5/overview) | 1M | 128K | $4 / $20 | Moderate | Adaptive (always on) | `medium` | Jun 2026 |
| **Claude Sonnet 5.5** (this model) | 1M | 128K | $2 / $10 | Fast | Adaptive | `high` | Jun 2026 |
| [Claude Haiku 5.5](https://platform.claude.com/docs/it/models/haiku-5-5/overview) | 1M | 128K | From $0.10 / $0.50 | Fastest | 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.
* **Latency:** Comparative latency, relative to the current lineup, as published in the models overview. Actual latency depends on prompt length, output length, and thinking effort.
* **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.
## Specifiche
### Model IDs
| Platform | Model ID |
| :----------------------------------------------------------------------------------------------------- | :---------------------------- |
| Claude API | `claude-sonnet-5-5` |
| [Amazon Bedrock](https://platform.claude.com/docs/it/build-with-claude/claude-in-amazon-bedrock) | `anthropic.claude-sonnet-5-5` |
| [Google Cloud](https://platform.claude.com/docs/it/build-with-claude/claude-on-vertex-ai) | `claude-sonnet-5-5` |
| [Microsoft Foundry](https://platform.claude.com/docs/it/build-with-claude/claude-in-microsoft-foundry) | `claude-sonnet-5-5` |
| [Claude Platform on AWS](https://platform.claude.com/docs/it/build-with-claude/claude-platform-on-aws) | `claude-sonnet-5-5` |
### Pricing
| Feature | Value |
| :------------------------------------------------------------------------------------- | :------------------------------- |
| Input | $2 / MTok |
| Output | $10 / MTok |
| [5m cache write](https://platform.claude.com/docs/it/build-with-claude/prompt-caching) | $2.50 / MTok |
| [1h cache write](https://platform.claude.com/docs/it/build-with-claude/prompt-caching) | $4 / MTok |
| [Cache read](https://platform.claude.com/docs/it/build-with-claude/prompt-caching) | $0.10 / MTok |
| [Batch API](https://platform.claude.com/docs/it/build-with-claude/batch-processing) | 50% discount on input and output |
[Full price list](https://platform.claude.com/docs/it/about-claude/pricing)
### Capabilities
| Feature | Value |
| :-------------------------------------------------------------------------------------------------------------------------- | :--------------------- |
| [Context window](https://platform.claude.com/docs/it/build-with-claude/context-windows) | 1M tokens |
| Max output | 128K tokens |
| [Max output (Batch API, beta)](https://platform.claude.com/docs/it/build-with-claude/batch-processing#extended-output-beta) | 300K tokens |
| [Thinking](https://platform.claude.com/docs/it/build-with-claude/thinking) | Adaptive |
| [Default effort](https://platform.claude.com/docs/it/build-with-claude/effort) | `high` |
| Comparative latency | Fast |
| Input → output | Text and images → text |
| Reliable knowledge cutoff | Jun 2026 |
| Training data cutoff | Jun 2026 |
### Availability
| Feature | Value |
| :---------------------------------------------------------------------------- | :---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| [Status](https://platform.claude.com/docs/it/about-claude/model-deprecations) | Active (latest) |
| Released | September 28, 2026 |
| Retirement | Not sooner than September 28, 2027 |
| Platforms | Claude API, [Amazon Bedrock](https://platform.claude.com/docs/it/build-with-claude/claude-in-amazon-bedrock), [Google Cloud](https://platform.claude.com/docs/it/build-with-claude/claude-on-vertex-ai), [Microsoft Foundry](https://platform.claude.com/docs/it/build-with-claude/claude-in-microsoft-foundry), [Claude Platform on AWS](https://platform.claude.com/docs/it/build-with-claude/claude-platform-on-aws) |
## Buono a sapersi
* L'"adaptive thinking" (ragionamento adattivo) è attivo per impostazione predefinita. L'impostazione di ragionamento più bassa è `between_tools`, che disattiva l'"up-front thinking" (ragionamento iniziale). Funziona con un livello di "effort" (sforzo) `high` o inferiore. Consulta [Novità di Claude Sonnet 5.5](https://platform.claude.com/docs/it/models/sonnet-5-5/whats-new-sonnet-5-5#turn-off-up-front-thinking).
* Impostare `temperature`, `top_p` o `top_k` su un valore diverso da quello predefinito restituisce un errore 400.
* La lunghezza minima di un prompt memorizzabile nella cache è di 512 token. Consulta ["Prompt caching" (cache dei prompt)](https://platform.claude.com/docs/it/build-with-claude/prompt-caching#cache-limitations).
* Sulla [Message Batches API](https://platform.claude.com/docs/it/build-with-claude/batch-processing#extended-output-beta), Claude Sonnet 5.5 supporta fino a 300k token di output con l'header beta `output-300k-2026-03-24`.
* Interroga limiti e capacità in modo programmatico con la [Models API](https://platform.claude.com/docs/it/api/models/list).
## Risorse
Differenze comportamentali e schemi di prompting specifici di Claude Sonnet 5.5.
Il controllo per la profondità del ragionamento, la "latency" (latenza) e il costo. Scegli un livello per ogni carico di lavoro.
Come funziona il ragionamento adattivo, quali impostazioni di ragionamento accetta ciascun modello e come vengono preservati i blocchi di ragionamento.
## Riferimento
Il prompt di sistema che Claude Sonnet 5.5 utilizza su claude.ai e nelle app Claude.
Valutazioni di sicurezza e decisioni di distribuzione per Claude Sonnet 5.5.
Listino prezzi completo, inclusi gli sconti batch e le tariffe della cache dei prompt.
Come funzionano gli ID dei modelli, gli alias e gli snapshot fissati.
Stato del ciclo di vita e impegni di ritiro per ogni modello Claude.