AnthropicText Generation/v1/ai/chat

Claude Haiku 5.5 API

Access Claude Haiku 5.5 through one API key. Anthropic Fast Low-Cost Claude.

Claude Haiku 5.5 is Anthropic's small, fast model for high-volume, cost-sensitive work, succeeding Claude Haiku 4.5 with stronger coding and computer use. It suits summarization, classification, subagents inside larger agents, and browser automation, anywhere you run Claude thousands of times a day.

Full Docs Get API Key — Free $5 Credit

No credit card required. Takes 30 seconds.

Claude Haiku 5.5 API pricing

Pay per request from your YepAPI balance — no subscription, no monthly minimum. Prices updated October 23, 2026.

Token type	Price
Input	$0.15 / 1M tokens
Output	$0.74 / 1M tokens
Context window	1M tokens

What it costs	Per job	Per 1,000
Chat reply1K input + 500 output tokens	$0.0005	$0.52
RAG answer8K input + 800 output tokens	$0.0018	$1.79
Agent step with tools30K input + 2K output tokens	$0.006	$5.98
Long document summary100K input + 2K output tokens	$0.016	$16.48

2,400+

Developers

1.2M+

API calls served

100+

Endpoints

$0.01

Per call

Yep, that's it.

Try it live

Send a message and see Claude Haiku 5.5 respond in real time.

POST/v1/ai/chatanthropic/claude-haiku-5.5

Message *

Max Tokens

Maximum tokens in the response.

Stream

Real-time tokens

Hit "Send Request" to see the response

Claude Haiku 5.5 specs

Provider	Anthropic
Model ID	anthropic/claude-haiku-5.5
Endpoint	/v1/ai/chat
Type	Text Generation
Context window	1M tokens
Max output	128K tokens
Reasoning	No
OpenAI-compatible	Yes — /v1/ai/chat/completions

How to get a Claude Haiku 5.5 API key

1
Create a free account
Sign up at yepapi.com with Google or email. It takes about 30 seconds and needs no card.
2
Create an API key
Open the dashboard, go to API Keys and create a key. Copy it — it starts with yep_sk_.
3
Call Claude Haiku 5.5
Send a request to /v1/ai/chat with the x-api-key header and model "anthropic/claude-haiku-5.5".
4
Pay as you go
Usage is billed per request from your balance. Top up any amount; there is no subscription.

Strengths

✓

Claude at Haiku prices

$0.15 per 1M input and $0.74 per 1M output tokens, a fraction of Haiku 4.5, for workloads where cost per call matters.

✓

Fast responses

Built for low latency, so it fits interactive UIs and the many small steps inside an agent.

✓

1M token context

Handles up to 1,000,000 tokens of input, unusual for a model in this price band.

✓

Subagents and browser use

Reliable tool calling and computer use make it a good worker model under a larger orchestrator.

Quick start

Copy this snippet and start making calls with Claude Haiku 5.5.

const res = await fetch('https://api.yepapi.com/v1/ai/chat', {
  method: 'POST',
  headers: {
    'x-api-key': 'YOUR_API_KEY',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
    "model": "anthropic/claude-haiku-5.5",
    "messages": [
      {
        "role": "user",
        "content": "Explain API gateways in 2 sentences."
      }
    ],
    "maxTokens": 256
  }),
});
const { data } = await res.json();
console.log(data.message.content);

Claude Haiku 5.5 vs similar models

Every model below runs on the same API key — switch by changing the model ID.

Model	Provider	Price	Context
Claude Haiku 5.5	Anthropic	$0.15 in / $0.74 out per 1M	1M
Claude Haiku 4.5	Anthropic	$1.48 in / $7.38 out per 1M	200K
Claude Sonnet 5	Anthropic	$2.95 in / $14.77 out per 1M	1M
Claude Sonnet 5.5	Anthropic	$2.95 in / $14.77 out per 1M	1M
Claude Sonnet 4.6	Anthropic	$4.43 in / $22.15 out per 1M	1M
Claude Sonnet 4.5	Anthropic	$4.43 in / $22.15 out per 1M	1M
Nemotron 3 Super	NVIDIA	$0 in / $0 out per 1M	262K
Qwen3.7 Flash	Qwen	$0.04 in / $0.19 out per 1M	1M

Why use Claude Haiku 5.5 through YepAPI?

✓One API key for all models — no separate accounts

✓OpenAI SDK compatible — just change the base URL

✓No monthly minimums — pay per token

✓Switch models with one line of code

✓Full provider passthrough — citations, search results, and all extras included

✓Streaming and non-streaming support on every model

✓Works with Cursor, Claude, LangChain, and any LLM tool

✓Unified billing across all providers

Claude Haiku 5.5 API — pricing, context window & access

Claude Haiku 5.5 is Anthropic's small, fast model for high-volume, cost-sensitive work, succeeding Claude Haiku 4.5 with stronger coding and computer use. It pairs a 1,000,000-token context window with up to 128,000 output tokens per response, at $0.15 per 1M input and $0.74 per 1M output tokens through YepAPI.

Through YepAPI you call Claude Haiku 5.5 on an OpenAI-compatible endpoint with a single key — the same key that reaches GPT-6, Claude, Gemini, Grok and the SEO, SERP and scraping APIs. Input: text, images, files.

What is Claude Haiku 5.5?

Claude Haiku 5.5 is Anthropic's small, fast model for high-volume, cost-sensitive work, succeeding Claude Haiku 4.5 with stronger coding and computer use. It keeps the 1M-token context of the larger Claude 5.5 models, so even cheap high-volume calls can take long documents without chunking. It accepts text, images, files as input, handles up to 1,000,000 tokens of context and returns up to 128,000 output tokens per call.

Build with Claude Haiku 5.5 via YepAPI

YepAPI serves Claude Haiku 5.5 on the OpenAI-compatible /v1/ai/chat endpoint. Point your base URL at YepAPI, add your key, and set the model string to claude-haiku-5.5 (or the full anthropic/claude-haiku-5.5). Function calling, structured outputs and reasoning settings pass straight through, and switching to any other model on the platform is a one-string change per request.

Claude Haiku 5.5 API pricing — $0.15 / 1M input, $0.74 / 1M output

Claude Haiku 5.5 costs $0.15 per 1M input tokens and $0.74 per 1M output tokens through YepAPI, pay per token with no minimums. Failed calls are never charged, and every request is itemised in your dashboard API Logs.

Claude Haiku 5.5 use cases

It suits summarization, classification, subagents inside larger agents, and browser automation, anywhere you run Claude thousands of times a day.

Try Claude Haiku 5.5 free

Every new YepAPI account includes $5 in free credit with no card required — enough to test Claude Haiku 5.5 on your own prompts before committing to paid usage. Create an account, copy your key, and call claude-haiku-5.5 right away.

Start generating in 30 seconds

$5 free credit on signup. No credit card required. Pay per call.

Get API Key

What developers say

“Switched from SerpAPI and cut our SERP costs by 80%. Same data quality, way simpler billing.”
Marcus T.
SEO Platform Founder

“One API key for AI models, SERP data, and web scraping. Saved us from managing 4 separate providers.”
Priya S.
Full-Stack Developer

“The $5 free credit let us prototype our entire rank tracking feature before committing. No other API does that.”
Jake R.
Indie Hacker

Frequently asked questions

Claude Haiku 5.5 costs $0.15 per 1M input tokens and $0.74 per 1M output tokens through YepAPI, billed per request with no monthly fee. For example, a chat reply (1K input + 500 output tokens) costs about $0.0005.

Sign up at yepapi.com (Google or email, about 30 seconds), open the dashboard and create an API key. The same key works for Claude Haiku 5.5 and every other model — no separate Anthropic account or waitlist.

New YepAPI accounts in most countries get free signup credit, enough to test Claude Haiku 5.5 without a card. After that you pay per request at the rates above — there is no subscription.

Use "anthropic/claude-haiku-5.5" as the model on /v1/ai/chat. The short alias "claude-haiku-5.5" also works.

Yes. Point the OpenAI SDK at https://api.yepapi.com/v1/ai with your YepAPI key and set model to "anthropic/claude-haiku-5.5". Streaming works the same way, so existing OpenAI code only needs the base URL and key changed.

Claude Haiku 5.5 supports a 1M token context window with up to 128K output tokens per request.

Ready to use Claude Haiku 5.5?

$5 free credit on signup. No credit card required. Pay per call.

Get API Key — Free $5 Credit Read Docs

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