Update Session changedapi/beta/sessions/update
Nearest release: v2.1.281, 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+10added
Lines−2removed
From line
21
where the diff opens
First seen
14 Aug 2026
this site's first read of the page
Recorded edits11to this page, all time
The whole hunk
from line 21, old and new numbered
/
from line 21
2121
2222 - `string`
2323
24 - `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`
24 - `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
2525
2626 - `"message-batches-2024-09-24"`
2727
from line 115
115115
116116 - `"compact-2026-09-04"`
117117
118 - `"inline-tools-2026-09-15"`
119
120 - `"mcp-client-2026-09-15"`
121
118122- `"anthropic-workspace-id": optional string`
119123
120124 Optional header to select the Workspace for this request. The value is a Workspace ID (for example, `wrkspc_011CZkZaBF1tNoB5wlCeusgy`).
from line 649
645649
646650 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
647651
648 - `"claude-fable-5-1" or "claude-sonnet-5" or "claude-fable-5" or 11 more`
652 - `"claude-opus-5-5" or "claude-fable-5-1" or "claude-sonnet-5" or 12 more`
649653
650654 The model that will power your agent.
651655
652656 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
657
658 - `"claude-opus-5-5"`
659
660 Powerful intelligence for coding, knowledge work, and long-running agents
653661
654662 - `"claude-fable-5-1"`
655663
No line in this hunk matches that.