Sweep 22 Sep 2026 · 17:19Z Build v2.1.280 501 read Stable v2.1.267 Latest v2.1.280 Next v2.1.280 Feeds RSS JSON llms.txt Unofficial
One change · api

beta-headers changed

api/beta-headers

Nearest release: v2.1.275, published an hour before this site recorded the change. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.

Recorded here
Lines+9added
Lines−1removed
From line 168 where the diff opens
First seen 14 Aug 2026 this site's first read of the page
Recorded edits5to this page, all time

The whole hunk

from line 168, old and new numbered
/
lines
from line 168
168168anthropic-beta: feature1,feature2,feature3
169169```
170170 
171When using an SDK, list each feature in the `betas` parameter (for example, `betas=["feature1", "feature2"]`). With the CLI, pass a single `--beta` flag with the feature names separated by commas (for example, `--beta feature1,feature2`). Avoid repeating the flag: currently only the first flag's value takes effect.
171You can also send the `anthropic-beta` header more than once in the same request. The Claude API reads every `anthropic-beta` header, so the following is equivalent to the previous example:
172 
173```http
174anthropic-beta: feature1
175anthropic-beta: feature2
176anthropic-beta: feature3
177```
178 
179When using an SDK, list each feature in the `betas` parameter (for example, `betas=["feature1", "feature2"]`). With the CLI, pass a single `--beta` flag with the feature names separated by commas (for example, `--beta feature1,feature2`). You can also repeat the flag (for example, `--beta feature1 --beta feature2`).
172180 
173181### Endpoint-specific headers
174182