# Claude Haiku 4.5 (20251001)

> A dated Anthropic snapshot built for fast responses, with near-frontier intelligence, reasoning, tool calling and image input.

## Key facts

- Model author: Anthropic
- Input: $1.00 per 1M tokens
- Output: $5.00 per 1M tokens
- Cached input: $0.10 per 1M tokens
- Context window: 200,000 tokens
- Maximum output: 64,000 tokens
- Input modalities: image, text
- Output modalities: text
- Capabilities: reasoning, tools, vision
- Released: 2025-10-01
- Knowledge cutoff: Feb 2025
- Model IDs: `anthropic/claude-haiku-4-5-20251001`
- Model page: https://www.realrelay.ai/model/anthropic/claude-haiku-4-5-20251001

## Overview

Claude Haiku 4.5 (20251001) is a model from Anthropic, identified by the snapshot date 20251001 in its model ID. Anthropic describes it as a fast model with near-frontier intelligence. It supports reasoning, tool calling and image input, which makes it a practical choice for applications where response time matters.

Claude Haiku 4.5 (20251001) has a 200K-token context window and can generate up to 64K output tokens. It accepts text and image input and returns text output. It was released on October 1, 2025. Its knowledge cutoff is February 2025.

## Capabilities

Claude Haiku 4.5 (20251001) supports reasoning, tool calling and image understanding. It accepts text and image as input and produces text as output.

With a 200K-token context window, it can read long documents or several screenshots in one request, reason over them and call tools to act on the result. A dated ID points to one specific snapshot.

## Pricing

Claude Haiku 4.5 (20251001) costs $1.00 per 1M input tokens and $5.00 per 1M output tokens. Cache reads are $0.10 per 1M tokens.

Claude Haiku 4.5 (20251001) is available through RealRelay's OpenAI-compatible API.

## Use cases

Use Claude Haiku 4.5 (20251001) in applications where response time matters, such as a support chat that reads a screenshot uploaded by a user and replies promptly.

It also suits tool-using assistants that call functions to look up data or trigger actions, and question answering over long documents that fit within the 200K-token window.

## Call it

OpenAI-compatible chat completions:

```bash
curl https://www.realrelay.ai/v1/chat/completions \
  -H "Authorization: Bearer $REALRELAY_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "anthropic/claude-haiku-4-5-20251001", "messages": [{"role": "user", "content": "Hello"}]}'
```

## FAQ

### What is Claude Haiku 4.5 (20251001)?

Claude Haiku 4.5 (20251001) is a model from Anthropic, identified by the snapshot date 20251001 in its model ID. It supports reasoning, tool calling and image understanding and accepts text and image input.

### How much does Claude Haiku 4.5 (20251001) cost?

Claude Haiku 4.5 (20251001) costs $1.00 per 1M input tokens and $5.00 per 1M output tokens, with cache reads at $0.10 per 1M tokens.

### What is the context window of Claude Haiku 4.5 (20251001)?

Claude Haiku 4.5 (20251001) has a 200K-token context window and can generate up to 64K tokens in a single response.

### What inputs and outputs does Claude Haiku 4.5 (20251001) support?

Claude Haiku 4.5 (20251001) accepts text and image input and returns text output.

### Does Claude Haiku 4.5 (20251001) support tool calling?

Yes. Claude Haiku 4.5 (20251001) supports tool calling, so it can call functions you define and use the results in multi-step tasks. It also supports reasoning and image understanding.

### When was Claude Haiku 4.5 (20251001) released?

Claude Haiku 4.5 (20251001) was released on October 1, 2025. Its knowledge cutoff is February 2025.

### How do I call Claude Haiku 4.5 (20251001) via the API?

Call Claude Haiku 4.5 (20251001) through RealRelay's OpenAI-compatible API using the model ID anthropic/claude-haiku-4-5-20251001.