# Claude Sonnet 5

Claude Sonnet 5 is a language model from Anthropic with a 1M-token context window. Provider list price is $3 per million input tokens and $15 per million output; on Allocate you pay $3.21 and $16.05. It is a closed model served over API; the weights are not published.

## Pricing

| | Provider list | On Allocate |
| --- | --- | --- |
| Input, per M tokens | $3 | $3.21 |
| Output, per M tokens | $15 | $16.05 |

Prices checked 2026-07-21.

## Facts

| Field | Value |
| --- | --- |
| Lab | Anthropic |
| Modality | Language |
| Context window | 1M tokens |
| License | Proprietary API |
| Open weights | No |
| Fine-tunable | No |
| Catalog id | anthropic/claude-sonnet-5 |

## What a real workload costs

Take 1,000,000 requests a month at 1,200 input and 350 output tokens each: 1,200M input and 350M output tokens. At list prices that is 1,200 × $3 + 350 × $15 = $8,850 a month. Billed on Allocate it is $9,470.

## Where it fits

Anthropic’s balanced flagship: careful reasoning with strong writing and judgment, and 1M tokens of context. The pick for customer-facing text where tone and safety carry real risk.

- Judgment calls with policy context
- Customer-facing writing
- Review and escalation flows

## Common questions

### How much does Claude Sonnet 5 cost per million tokens?

Provider list price is $3 per million input tokens and $15 per million output tokens. On Allocate you pay $3.21 in and $16.05 out.

### What context window does Claude Sonnet 5 have?

1,000,000 tokens (1M). At roughly 0.75 words per token, that is about 750k words of English text per request.

### Can I fine-tune Claude Sonnet 5?

No. Claude Sonnet 5 is a closed model served over API; the weights are not published. If you want a model you can train and own, start from an open-weights base in the catalog and fine-tune that.

### How do I call Claude Sonnet 5 on Allocate?

Send anthropic/claude-sonnet-5 in the model field of the OpenAI-compatible endpoint at api.allocate.network/v1, or point a route name (like prod/support-agent) at it so you can swap the model later without a deploy.

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[HTML page](https://allocate.network/models/sonnet-5) · [Machine-readable catalog](https://allocate.network/catalog.json)