# claude-sonnet-4-6 — API, Pricing & Context Window

claude-sonnet-4-6 on Vivgrid: Anthropic's balanced Sonnet model with a 1M-token context window, Messages API, and geo-distributed acceleration.

`claude-sonnet-4-6` is Anthropic's balanced Sonnet model, offering much of Opus's coding and reasoning quality at a lower price and faster speed. Its **1M-token context window** makes it a versatile workhorse for production agents.

On Vivgrid, `claude-sonnet-4-6` is geo-distributed across **AMER and EMEA** and reachable on the **Messages API** through the same unified key as the rest of the catalog.

## Specifications

|     |     |
| --- | --- |
| **Provider** | Anthropic |
| **Model ID** | `claude-sonnet-4-6` |
| **Best for** | Coding |
| **Context window** | 1,000,000 tokens |
| **Max output** | 128,000 tokens |
| **Modalities** | Text, Image |
| **Tool / function calling** | Yes |
| **Knowledge cutoff** | 2025-08 |
| **Acceleration** | ⚡ Geo-Distributed — AMER, EMEA |

## Pricing

Pricing in USD per 1M tokens, matching the provider's rates.

| Input | Cached input | Output |
| --- | --- | --- |
| $4.00 | $1.00 | $15.00 |

## Quick start

Call `claude-sonnet-4-6` through Vivgrid's unified, OpenAI-compatible endpoint. Get an API key from the [Vivgrid Console](https://console.vivgrid.com/).

```
curl https://api.vivgrid.com/v1/messages \
  -H "Authorization: Bearer $VIVGRID_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "claude-sonnet-4-6",
    "max_tokens": 1024,
    "messages": [\
      { "role": "user", "content": "Say hello in English, Chinese and Spanish." }\
    ],
    "stream": true
  }'
```

## Ideal use cases

- Everyday coding agents balancing quality, speed, and cost
- High-volume reasoning and content workflows
- Long-context analysis within a 1M-token budget
- Production assistants needing reliable tool use

## Related models

- [claude-sonnet-5](/content/docs/models/claude-sonnet-5/index.html) — the latest Sonnet release
- [claude-opus-4-8](/content/docs/models/claude-opus-4-8/index.html) — the frontier Opus model
- [claude-haiku-4-5](/content/docs/models/claude-haiku-4-5/index.html) — the fastest, cheapest Claude
- [gpt-5.4](/content/docs/models/gpt-5.4) — comparable OpenAI coding model