---
title: Claude Opus 5.5
url: https://platform.claude.com/docs/it/models/opus-5-5/overview
description: "Claude Opus 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 22, 2026.

For long-running agentic coding and knowledge work

Model ID: `claude-opus-5-5`

Context window: 1M tokens · Max output: 128K tokens · Input pricing: $4 / MTok · Output pricing: $20 / MTok

[Announcement](https://www.anthropic.com/claude-opus-5-5) · [What’s new](https://platform.claude.com/docs/it/models/opus-5-5/whats-new-opus-5-5) · [Migration guide](https://platform.claude.com/docs/it/models/opus-5-5/migration-guide)

## Panoramica

Claude Opus 5.5 è progettato per il coding agentico di lunga durata e per il lavoro di conoscenza, con un prezzo di $4 / $20 USD per milione di token di input / output. Quattro "breaking changes" (modifiche incompatibili) interessano il codice già in esecuzione su Claude Opus 5: [il ragionamento non può essere disabilitato](https://platform.claude.com/docs/it/models/opus-5-5/whats-new-opus-5-5#thinking-cant-be-disabled), [l'uso forzato degli strumenti restituisce un errore](https://platform.claude.com/docs/it/models/opus-5-5/whats-new-opus-5-5#forced-tool-use-is-not-supported), [i blocchi di ragionamento sono legati al modello e alla conversazione](https://platform.claude.com/docs/it/models/opus-5-5/whats-new-opus-5-5#thinking-blocks-are-tied-to-the-model-that-produced-them) e, sulla Claude API e su Google Cloud, [lo strumento di computer use precedente `computer_20251124` non è accettato](https://platform.claude.com/docs/it/models/opus-5-5/whats-new-opus-5-5#computer-20251124-is-not-supported). Le prime tre si applicano anche a Claude Fable 5.1. Un'ulteriore modifica altera la struttura 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/opus-5-5/whats-new-opus-5-5#text-between-tool-calls) il cui testo è vuoto con l'impostazione `display` predefinita. Un'applicazione che trasmette in streaming quel testo ai propri utenti come aggiornamenti di avanzamento resta silenziosa tra le chiamate agli strumenti finché non imposta un valore di `display` che restituisce il testo.

[Novità di Claude Opus 5.5](https://platform.claude.com/docs/it/models/opus-5-5/whats-new-opus-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** (this model)                                                    | 1M      | 128K       | $4 / $20           | Moderate | Adaptive (always on) | `medium`       | Jun 2026         |
| [Claude Sonnet 5.5](https://platform.claude.com/docs/it/models/sonnet-5-5/overview) | 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-opus-5-5`           |
| [Amazon Bedrock](https://platform.claude.com/docs/it/build-with-claude/claude-in-amazon-bedrock)       | `anthropic.claude-opus-5-5` |
| [Google Cloud](https://platform.claude.com/docs/it/build-with-claude/claude-on-vertex-ai)              | `claude-opus-5-5`           |
| [Microsoft Foundry](https://platform.claude.com/docs/it/build-with-claude/claude-in-microsoft-foundry) | `claude-opus-5-5`           |
| [Claude Platform on AWS](https://platform.claude.com/docs/it/build-with-claude/claude-platform-on-aws) | `claude-opus-5-5`           |

### Pricing

| Feature                                                                                | Value                            |
| :------------------------------------------------------------------------------------- | :------------------------------- |
| Input                                                                                  | $4 / MTok                        |
| Output                                                                                 | $20 / MTok                       |
| [5m cache write](https://platform.claude.com/docs/it/build-with-claude/prompt-caching) | $5 / MTok                        |
| [1h cache write](https://platform.claude.com/docs/it/build-with-claude/prompt-caching) | $8 / MTok                        |
| [Cache read](https://platform.claude.com/docs/it/build-with-claude/prompt-caching)     | $0.20 / 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 (always on)   |
| [Default effort](https://platform.claude.com/docs/it/build-with-claude/effort)                                              | `medium`               |
| Comparative latency                                                                                                         | Moderate               |
| 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 22, 2026                                                                                                                                                                                                                                                                                                                                                                                                      |
| Retirement                                                                    | Not sooner than September 22, 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) |

## Da sapere

* L'"adaptive thinking" (ragionamento adattivo) è sempre attivo e non può essere disattivato. Controlla la profondità del ragionamento con il [parametro effort](https://platform.claude.com/docs/it/build-with-claude/effort).
* Sulla [Message Batches API](https://platform.claude.com/docs/it/build-with-claude/batch-processing#extended-output-beta), Claude Opus 5.5 supporta fino a 300k token di output con l'header beta `output-300k-2026-03-24`.
* La lunghezza minima di un prompt memorizzabile nella cache è di 512 token. Consulta [Cache dei prompt](https://platform.claude.com/docs/it/build-with-claude/prompt-caching#cache-limitations).
* Interroga limiti e capacità in modo programmatico con la [Models API](https://platform.claude.com/docs/it/api/models/list).

## Risorse

<CardGroup cols={3}>
  <Card title="Scrivere prompt per Claude Opus 5.5" icon="lightbulb" href="https://platform.claude.com/docs/it/build-with-claude/prompt-engineering/prompting-claude-opus-5-5">
    Differenze comportamentali e pattern di prompting specifici di Claude Opus 5.5.
  </Card>

  <Card title="Effort" icon="sliders" href="https://platform.claude.com/docs/it/build-with-claude/effort">
    Il controllo per la profondità del ragionamento, la "latency" (latenza) e il costo. Scegli un livello per ogni carico di lavoro.
  </Card>

  <Card title="Ragionamento adattivo" icon="brain" href="https://platform.claude.com/docs/it/build-with-claude/thinking">
    Come funziona il ragionamento adattivo e come vengono preservati i blocchi di ragionamento.
  </Card>

  <Card title="Modalità veloce" icon="lightning" href="https://platform.claude.com/docs/it/build-with-claude/fast-mode">
    Claude Opus 5.5 a latenza ridotta sulla Claude API, con prezzi separati.
  </Card>
</CardGroup>

## Riferimento

<CardGroup cols={3}>
  <Card title="Prompt di sistema" icon="text" href="https://platform.claude.com/docs/it/release-notes/system-prompts/claude-opus-5-5">
    Il prompt di sistema che Claude Opus 5.5 utilizza su claude.ai e nelle app Claude.
  </Card>

  <Card title="System card" icon="file" href="https://www.anthropic.com/claude-opus-5-5-system-card">
    Valutazioni di sicurezza e decisioni di distribuzione per Claude Opus 5.5.
  </Card>

  <Card title="Prezzi" icon="coins" href="https://platform.claude.com/docs/it/about-claude/pricing">
    Listino prezzi completo, inclusi gli sconti batch e le tariffe della cache dei prompt.
  </Card>

  <Card title="ID dei modelli e versionamento" icon="fingerprint" href="https://platform.claude.com/docs/it/about-claude/models/model-ids-and-versions">
    Come funzionano gli ID dei modelli, gli alias e gli snapshot fissati.
  </Card>

  <Card title="Deprecazioni dei modelli" icon="clock" href="https://platform.claude.com/docs/it/about-claude/model-deprecations">
    Stato del ciclo di vita e impegni di ritiro per ogni modello Claude.
  </Card>
</CardGroup>
