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

> Source: https://vivgrid.com/docs/models/claude-sonnet-4-6

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

| Field | Value |
| --- | --- |
| Provider | Anthropic |
| Model ID | `claude-sonnet-4-6` |
| Best for | Coding |
| Available on | Chat Completions, Vibe 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.

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

### What one request costs

The rates above applied to a 20K-token prompt with a 2K-token reply — a typical single agent turn, small enough that every request is billed at the base rate.

| Request | Cost |
| --- | --- |
| Cold prompt, nothing cached | $0.1100 |
| Warm prompt, 90% of the input served from cache | $0.0560 |


## API surfaces

The Vivgrid Console catalogs `claude-sonnet-4-6` on 2 surfaces, all behind the same API key. The endpoint shown is the one the Console previews for that surface.

| Surface | Primary endpoint | Use it for |
| --- | --- | --- |
| Chat Completions | `/chat/completions` | Agent projects, where Vivgrid injects the model, system prompt and tools server-side, and Model API calls that name the model per request. |
| Vibe coding | `/messages` | Coding CLIs and IDE agents that drive the model themselves — point the tool at Vivgrid and keep your own loop. |

## Quick start

Get an API key from the Vivgrid Console (https://console.vivgrid.com), then call `claude-sonnet-4-6` directly.

### `/chat/completions`

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

### `/messages`

```bash
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

- [gpt-6-astra](/docs/models/gpt-6-astra) — OpenAI's frontier gpt-6 coding model
- [claude-sonnet-5-5](/docs/models/claude-sonnet-5-5) — the latest Sonnet release
- [claude-opus-5-5](/docs/models/claude-opus-5-5) — the latest frontier Opus model