Projects

Amazon Bedrock Projects provide cost attribution at the application and workload level for the Responses API and Chat Completions API on the bedrock-mantle endpoint. When you tag a project, those tags flow to AWS Cost Explorer and AWS Cost and Usage Reports (CUR 2.0), so you can filter and group Amazon Bedrock spend by application, team, environment, cost center, or any other dimension.

For cost attribution using Amazon Bedrock runtime APIs (InvokeModel API / Converse API / Chat Completions API), see Application inference profiles.

How cost attribution works

When you associate an inference request with a project, the project's tags are attached to the billing record for that request. Tags appear as AWS cost allocation tags in CUR and Cost Explorer, with the same behavior as tags on other AWS resources. For more information, see Organizing and tracking costs using AWS cost allocation tags.

Pass the project ID when initializing your client. All requests made with that client are attributed to the project.

Python

from openai import OpenAI

client = OpenAI(project="proj_123")

response = client.chat.completions.create(
    model="openai.gpt-oss-120b",
    messages=[{"role": "user", "content": "Hello"}]
)

cURL

curl -X POST $OPENAI_BASE_URL/responses \
    -H "Authorization: Bearer $OPENAI_API_KEY" \
    -H "Content-Type: application/json" \
    -H "OpenAI-Project: proj_123" \
    -d '{
        "model": "openai.gpt-oss-120b",
        "input": "Hello"
    }'

Tagging projects for cost allocation

You assign tags when you create or update a project through the Projects API. Common tag dimensions include:

You can define any tags that match your organizational structure. For tag limits and naming rules, see Tagging Amazon Bedrock resources.

Viewing project costs

After tagging your projects, activate the tags as cost allocation tags in the AWS Billing and Cost Management console:

Tags can take up to 24 hours to appear in Cost Explorer and CUR after activation. Cost allocation tags are not retroactive. Only costs incurred after activation are tagged. For more information, see Activating user-defined cost allocation tags.

After tag activation, you can analyze Amazon Bedrock costs by project in the following tools: