Create Session changedapi/beta/sessions/create
Nearest release: v2.1.322, published 2 hours 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.
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Lines+11added
Lines−1removed
From line
127
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First seen
14 Aug 2026
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Recorded edits27to this page, all time
The whole hunk
from line 127, old and new numbered
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127127
128128 - `"webhooks-2026-10-07"`
129129
130 - `"admin-user-sign-out-2026-10-08"`
131
130132 - `"message-threads-2026-08-12"`
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132134 - `"analytics-usage-cost-2026-08-24"`
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199201
200202 Replacement model. Accepts the model string, e.g. `claude-opus-5-5`, or a `model_config` object. Omit to use the agent's model.
201203
202 - `BetaManagedAgentsModel = "claude-haiku-5-5" or "claude-sonnet-5-5" or "claude-opus-5-5" or 14 more or string`
204 - `BetaManagedAgentsModel = "claude-fable-5-2" or "claude-haiku-5-5" or "claude-sonnet-5-5" or 15 more or string`
203205
204206 The model that will power your agent.
205207
206208 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
207209
210 - `"claude-fable-5-2"`
211
212 Built for the most ambitious work in coding, enterprise workflows, and the sciences
213
208214 - `"claude-haiku-5-5"`
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210216 Fastest model for high-volume, real-time tasks
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13261332 The model that will power your agent.
13271333
13281334 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
1335
1336 - `"claude-fable-5-2"`
1337
1338 Built for the most ambitious work in coding, enterprise workflows, and the sciences
13291339
13301340 - `"claude-haiku-5-5"`
13311341
No line in this hunk matches that.