Claude Haiku 5.5 API

Anthropic · model page

What Claude Haiku 5.5 is

On 7 October 2026, Anthropic introduced Claude Haiku 5.5 as the cheapest, fastest, and most capable small model it had released. Anthropic says it is designed for high-volume, cost-sensitive work such as summaries, classification, database queries, subagents, customer support, and browser use.

Anthropic says Haiku 5.5 is available on the Claude Platform and on Amazon Web Services, Google Cloud, and Microsoft Azure. OpenRouter lists anthropic/claude-haiku-5.5. bnrouter does not invent a gateway model id or a price for this page.

Official announcement: Read Anthropic’s Claude Haiku 5.5 post (7 October 2026)

Where developers can use it

Anthropic lists these official surfaces first. bnrouter is an optional OpenAI-compatible gateway in front of connected upstream accounts.

Claude Platform, as named in Anthropic’s 7 October 2026 post
Amazon Web Services, Google Cloud, and Microsoft Azure
OpenRouter listing anthropic/claude-haiku-5.5
bnrouter, if the operator has connected an upstream that serves this model. The plaza may still show coming soon — confirm the id in the console or GET /v1/models.

How to call it through bnrouter

bnrouter accepts the OpenAI chat completions protocol. Create an API key in the console, then send requests to the gateway base URL. This repository does not yet record a gateway model id — copy the id shown in the console (or from GET /v1/models) into the model field. The plaza listing may still show coming soon.

curl

curl https://www.bnrouter.com/v1/chat/completions \
  -H "Authorization: Bearer $YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "YOUR_MODEL_ID",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

Python (OpenAI SDK)

from openai import OpenAI

client = OpenAI(
    api_key="YOUR_API_KEY",
    base_url="https://www.bnrouter.com/v1",
)

resp = client.chat.completions.create(
    model="YOUR_MODEL_ID",
    messages=[{"role": "user", "content": "Hello!"}],
)
print(resp.choices[0].message.content)

Replace YOUR_API_KEY and YOUR_MODEL_ID with values from the console. Do not assume a model id that is not listed there.

Pricing

See current price in console.

Questions

What is Claude Haiku 5.5?

Anthropic’s 7 October 2026 announcement describes Claude Haiku 5.5 as its cheapest, fastest, and most capable small model, aimed at high-volume, cost-sensitive tasks.

When did Anthropic release Claude Haiku 5.5?

Anthropic published the announcement on 7 October 2026 and said it was available on the Claude Platform and major clouds the same day.

How do I call Claude Haiku 5.5 through bnrouter?

Create a key in the console and POST to the OpenAI-compatible /v1/chat/completions endpoint on the gateway. Use the model id shown in the console — this repo does not yet list one. The plaza may still show coming soon.

What model id should I send?

Use the identifier listed for this model in the console or returned by GET /v1/models. A gateway model id is not configured in this repository.

How much does the Claude Haiku 5.5 API cost on bnrouter?