Azure OpenAI usage export: version 2

Applies to the daily usage export delivered to your storage. Version 2 starts with usage for Friday 09 April 2027. The last version 1 file is usage for Thursday 08 April 2027. There is no overlap period: each day is delivered in one version only.

What changes

Version 1	Version 2	Notes
`usage_YYYY-MM-DD.csv` in the export folder	`v2/usage_YYYY-MM-DD.csv`	New subfolder. Delivery time is unchanged.
`usage_date`: your billing time zone	`usage_date_utc`: UTC	Days now run midnight to midnight UTC, so a day's totals move against version 1.
`api_key_id`	`key_id`	Same values.
`deployment`	`deployment_name` and `model`	`model` is the base model behind the deployment, e.g. `gpt-4o`.
`input_tokens`	`prompt_tokens` and `cached_prompt_tokens`	Cached prompt tokens are reported separately and billed at half the prompt rate. `prompt_tokens` excludes them.
`output_tokens`	`completion_tokens`	Same values.
`cost_usd`	`billed_amount` and `billing_currency`	`billing_currency` is `USD` for all US agreements.

Example row

usage_date_utc,key_id,deployment_name,model,prompt_tokens,cached_prompt_tokens,completion_tokens,billed_amount,billing_currency
2027-04-09,kmm-aoai-1a2b3c4d,kmm-gpt4o-prod,gpt-4o,1843200,512000,402100,9.4210,USD

What stays the same

One CSV per day, one row per key and deployment, header row first.
Costs are as billed; invoices continue to total the same rows.

Questions

Contact your account team. Version 1 cannot be extended past the date above.