# Anthropic: claude-sonnet-4-5

- Model ID: `claude-sonnet-4-5`
- Provider: Anthropic
- Web version: https://www.moleapi.com/en/models/anthropic/claude-sonnet-4-5
- Content status: verified

## Model introduction

Claude Sonnet 4.5 is the balanced Claude 4.5 model for enterprise retrieval, coding, data analysis, and scaled agent work.

## Model capabilities

- OpenAI compatible
- Anthropic compatible
- Prompt cache
- Reasoning

### Verified specifications

- Official positioning: Balanced Claude 4.5 enterprise model
- Context window: Up to 1,000,000 tokens
- Maximum output: 64,000 tokens
- Input / output: Text, image, PDF / Text

## Model pricing and access

Pricing is supplied dynamically by the MoleAPI console API.

### Standard (default, x1)

- Input: $3 / 1M tokens
- Output: $15 / 1M tokens
- Cache read: $0.3 / 1M tokens

### Discount (discount, x0.8)

- Input: $2.4 / 1M tokens
- Output: $12 / 1M tokens
- Cache read: $0.24 / 1M tokens

### Relay (relay, x0.3)

- Input: $0.9 / 1M tokens
- Output: $4.5 / 1M tokens
- Cache read: $0.09 / 1M tokens

### Access protocols

| Protocol | Method | Endpoint |
| --- | --- | --- |
| openai | POST | /v1/chat/completions |
| anthropic | POST | /v1/messages |

- Live pricing source: https://home.moleapi.com/api/pricing

## About claude-sonnet-4-5

Claude Sonnet 4.5 is the balanced Claude 4.5 model for enterprise retrieval, coding, data analysis, and scaled agent work.

### Best for

Enterprise knowledge bases, sales and operations automation, coding assistance, long-document analysis, and multi-step tool workflows.

### Core strengths

- Balances intelligence, speed, and price for scaled deployment.
- Supports long context, images, PDFs, extended thinking, and tools.
- Mature behavior fits projects that need a pinned older model.

### Limitations

- Sonnet 4.6 offers stronger capability and token efficiency at the same tier.
- Long context and extended thinking still need explicit budgets.

### Selection and production evaluation

Start a claude-sonnet-4-5 evaluation by mapping its official positioning to real work: Enterprise knowledge bases, sales and operations automation, coding assistance, long-document analysis, and multi-step tool workflows. The first pass should exercise both its main strength, "Balances intelligence, speed, and price for scaled deployment.", and its known limitation, "Sonnet 4.6 offers stronger capability and token efficiency at the same tier.", instead of relying on a single subjective general-chat comparison.

For access, MoleAPI currently lists openai, anthropic protocols and the Standard, Discount, Relay billing groups for this Anthropic model; the default price summary is Input $3 / 1M tokens · Output $15 / 1M tokens. Pricing, protocols, and groups come from the live catalog, so production planning should still price representative requests using real context length, output size, and cache-hit assumptions.

No independent ranking is shown unless it matches this exact model ID and reasoning profile, so nearby variants are not used as a proxy. Before launch, pin the model ID, prompt, and sample set, then compare task accuracy, structured-output validity, tool-call success, and timeout rates under the same conditions.

The model material on this page was last checked on 2026-07-24. When upstream model cards, context limits, or tool support change, update the cited bilingual facts before changing the recommendation; live MoleAPI price changes remain separate and update from the catalog automatically.

### Sources

- [B.AI Claude Sonnet 4.5 model guide](https://docs.b.ai/llmservice/models/claude-sonnet-4-5/) — B.AI
- [Anthropic Claude model card resources](https://platform.claude.com/docs/en/resources/overview) — Anthropic
- Last verified: 2026-07-24

## Code examples

### cURL

```bash
curl https://api.moleapi.com/v1/chat/completions \
  -H "Authorization: Bearer $MOLEAPI_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"claude-sonnet-4-5","messages":[{"role":"user","content":"Hello"}]}'
```

## More related models

- [claude-fable-5](https://www.moleapi.com/en/models/anthropic/claude-fable-5) — Anthropic
- [claude-opus-5](https://www.moleapi.com/en/models/anthropic/claude-opus-5) — Anthropic
- [claude-sonnet-5](https://www.moleapi.com/en/models/anthropic/claude-sonnet-5) — Anthropic
- [gpt-5.6-luna](https://www.moleapi.com/en/models/openai/gpt-5.6-luna) — OpenAI
- [gpt-5.6-sol](https://www.moleapi.com/en/models/openai/gpt-5.6-sol) — OpenAI
- [gpt-5.6-terra](https://www.moleapi.com/en/models/openai/gpt-5.6-terra) — OpenAI

## Frequently asked questions

### How is claude-sonnet-4-5 priced?

Prices are read from the MoleAPI console API and update with model prices, context tiers, and account groups.

### How can I access claude-sonnet-4-5?

The catalog currently lists openai, anthropic.

### How do I switch an existing project to claude-sonnet-4-5?

Keep the MoleAPI API address and key, replace the model parameter, and check protocol-specific parameters.

### Where do the claude-sonnet-4-5 details come from?

Capabilities and limitations are checked against B.AI and the other cited pages; pricing and protocols come from the MoleAPI console.