---
title: "Claude Sonnet 5.5"
description: "Claude Sonnet 5.5 by Anthropic: 1M context. Compare provider prices and applicable pricing conditions on the model page. Pay as you go."
canonical: https://pirouter.ai/models/anthropic/claude-sonnet-5.5
last-updated: 2026-10-15
---

# Claude Sonnet 5.5

> Claude Sonnet 5.5 by Anthropic: 1M context. Compare provider prices and applicable pricing conditions on the model page. Pay as you go.

Claude Sonnet 5.5 is Anthropic's current Sonnet model, positioned for a balance of speed and intelligence below Opus 5.5. It supports adaptive thinking, tool use, and text, image and PDF input with a 1M-token context and 128K output.

## At a glance

- Model ID: `anthropic/claude-sonnet-5.5`
- Also accepted as: `claude-sonnet-5-5`, `claude-sonnet-5.5`
- Vendor: Anthropic
- Category: text
- Openness: Proprietary
- Model page: https://platform.claude.com/docs/en/models/sonnet-5-5/overview
- Context: 1,000,000 tokens
- Max output: 128,000 tokens
- Added to pirouter: 2026-09-28
- Knowledge cutoff: 2026-06-01
- Status: Available

## Pricing (USD per 1M tokens)

|  | Input | Output | Cache read | Cache write | Cache write (1h) | Reasoning |
|---|---|---|---|---|---|---|
| Standard | $2 | $10 | $0.1 | $2.5 | $4 | $10 |

## Capabilities

- Function calling
- Tool choice
- Parallel tool calls
- Reasoning
- Prompt caching
- System messages
- Streaming
- Vision
- PDF input

## Reasoning effort

- max, xhigh, high, medium, low (default: high)

## How to call it

One pirouter API key works with every API format below; create it in the console. Use one of these formats; formats not listed are not available for this model.

- API key: https://app.pirouter.ai/sign-in

### OpenAI Responses

- Endpoint: `POST /v1/responses` on https://api.pirouter.ai
- Auth: `Authorization: Bearer <key>`
- SDK base URL: https://api.pirouter.ai/v1
- Reference: https://pirouter.ai/docs/api/responses

```bash
curl https://api.pirouter.ai/v1/responses \
  -H "Authorization: Bearer $PIROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "anthropic/claude-sonnet-5.5",
    "input": "Hello!"
  }'
```

### OpenAI Chat

- Endpoint: `POST /v1/chat/completions` on https://api.pirouter.ai
- Auth: `Authorization: Bearer <key>`
- SDK base URL: https://api.pirouter.ai/v1
- Reference: https://pirouter.ai/docs/api/chat-completions

```bash
curl https://api.pirouter.ai/v1/chat/completions \
  -H "Authorization: Bearer $PIROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "anthropic/claude-sonnet-5.5",
    "messages": [{ "role": "user", "content": "Hello!" }]
  }'
```

### Anthropic Messages

- Endpoint: `POST /v1/messages` on https://api.pirouter.ai
- Auth: `x-api-key: <key>`
- SDK base URL: https://api.pirouter.ai
- Reference: https://pirouter.ai/docs/api/messages

```bash
curl https://api.pirouter.ai/v1/messages \
  -H "x-api-key: $PIROUTER_API_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "anthropic/claude-sonnet-5.5",
    "max_tokens": 1024,
    "messages": [{ "role": "user", "content": "Hello!" }]
  }'
```

## Providers

One row per provider; pirouter sends each request to a healthy one.

| Provider | API format | Context | Max output | Input /M | Output /M | Trains on your data | Data retention |
|---|---|---|---|---|---|---|---|
| anthropic | openai, anthropic | 1,000,000 | 128,000 | $2 | $10 | No | Limited |
| azure | openai, anthropic | 1,000,000 | 128,000 | $2 | $10 | No | Limited |

## Rankings

Where this model ranks on each blind-vote leaderboard, listing the boards where it makes the top 100. Open a board for the full ranking.

| Board | Rank | Score |
|---|---|---|
| [Web dev](https://pirouter.ai/rankings/webdev) | #3 / 121 | 1786 |

Data: [LMArena leaderboard dataset](https://huggingface.co/datasets/lmarena-ai/leaderboard-dataset), used under [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/) · Updated 2026-10-01

## Supported parameters

`tools`, `tool_choice`, `parallel_tool_calls`, `max_tokens`, `stop`, `reasoning`, `include_reasoning`, `stream`

## Links

- HTML: https://pirouter.ai/models/anthropic/claude-sonnet-5.5
- JSON: https://pirouter.ai/api/models/anthropic/claude-sonnet-5.5
- Providers JSON: https://api.pirouter.ai/v1/models/anthropic/claude-sonnet-5.5/endpoints
- Leaderboard ranks (JSON): https://pirouter.ai/api/models/anthropic/claude-sonnet-5.5/rankings
- Catalog: https://pirouter.ai/models
- Quickstart: https://pirouter.ai/docs/quickstart
- How routing works: https://pirouter.ai/docs/routing
- llms.txt: https://pirouter.ai/llms.txt

---

HTML version: https://pirouter.ai/models/anthropic/claude-sonnet-5.5 · Machine-readable index: https://pirouter.ai/llms.txt