# Claude Sonnet 4.5

> Claude Sonnet 4.5 on Clonvo: 200K context, $3.00 input and $15.00 output per 1M tokens.

Latest Claude Sonnet with improved reasoning and extended thinking.

This model is being retired

Anthropic deprecated it on Oct 30, 2026. Requests will be rejected from Nov 24, 2026. Move to a newer model before then.

-   Model id: `anthropic/claude-sonnet-4-5`
-   Provider: Anthropic
-   Released: Sep 29, 2025
-   Context: 200K tokens
-   Max output: 64K tokens

## Pricing

The provider’s list price in USD. Requests on credits are charged exactly this; each response reports its cost in usage.cost.

| Charge | Price | Unit |
| --- | --- | --- |
| Input (prompt) | $3.00 | per 1M tokens |
| Output (completion) | $15.00 | per 1M tokens |
| Cache read | $0.30 | per 1M tokens |
| Cache write | $3.75 | per 1M tokens |
| Cache write (1 hour) | $6.00 | per 1M tokens |
| Web search | $0.01 | per search |

## Capabilities

-   Tools
-   Vision
-   Reasoning
-   Structured outputs
-   Web search

### Reasoning efforts

Values accepted for `reasoning_effort` or `reasoning.effort`:

-   `low`
-   `medium`
-   `high`
-   `xhigh`
-   `max`

## Quick start

Use the OpenAI SDK with Clonvo’s base URL and this model id.

```python
import os
from openai import OpenAI

client = OpenAI(
    base_url="https://api.clonvo.com/v1",
    api_key=os.environ["CLONVO_API_KEY"],
)

completion = client.chat.completions.create(
    model="anthropic/claude-sonnet-4-5",
    messages=[{"role": "user", "content": "Summarise the plot of Hamlet in one sentence."}],
)
print(completion.choices[0].message.content)
```

## Data policy

Requests to this model are sent to Anthropic, whose API terms govern how they handle your data: [Anthropic data policy](https://www.anthropic.com/legal/commercial-terms). Clonvo doesn’t store prompts or responses unless your organization turns on retention.

## Bring your own key

From Pay as you go up, a Anthropic key added under Provider keys is used for this model before your credits: $25,000 a month free, then 4% of list price. [How bring-your-own-key works](https://clonvo.com/docs/byok.md).