Anthropic · model page
What Claude Opus 5.5 is
On 22 September 2026, Anthropic introduced Claude Opus 5.5 as the first model in the Claude 5.5 family. Anthropic describes it as a flagship model for long-running agentic coding and knowledge work, and says Claude Haiku 5.5 followed in the same family.
Anthropic says Opus 5.5 is available on the Claude API, Amazon Bedrock, Claude Platform on AWS, Google Cloud, and Microsoft Foundry. OpenRouter lists anthropic/claude-opus-5.5. bnrouter does not invent a gateway model id or a price for this page.
Official announcement: Read Anthropic’s Claude Opus 5.5 post (22 September 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 API / Claude Platform, as named in Anthropic’s 22 September 2026 post
- Amazon Bedrock, Google Cloud, and Microsoft Foundry
- OpenRouter listing anthropic/claude-opus-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 https://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!"}]
}'from openai import OpenAI
client = OpenAI(
api_key="YOUR_API_KEY",
base_url="https://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 pay-as-you-go price after you register at https://console.bnrouter.com. This page does not list a gateway price.
Questions
What is Claude Opus 5.5?
Anthropic’s 22 September 2026 announcement describes Claude Opus 5.5 as the first Claude 5.5 model and a flagship tier for long-running agentic coding and knowledge work.
How does it relate to Claude Haiku 5.5?
Anthropic announced Opus 5.5 first, then said Claude Haiku 5.5 would follow in the same 5.5 family. This site has a separate Haiku 5.5 page. On bnrouter, confirm each model in the plaza or GET /v1/models — listings may still show coming soon. See also the models index, quickstart, pricing, and API reference.
How do I call Claude Opus 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. Do not treat anthropic/claude-opus-5.5 as a bnrouter id.
How much does the Claude Opus 5.5 API cost on bnrouter?
See current pay-as-you-go price after you register at https://console.bnrouter.com. This page does not list a gateway price.
Related pages
Try it in the console
Create an API key, confirm the model id in the model plaza, and send a first request.
Open console