Create Session changedapi/beta/sessions/create
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181
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from line 181, old and new numbered
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182182 Replacement model. Accepts the model string, e.g. `claude-opus-5`, or a `model_config` object. Omit to use the agent's model.
183183
184 - `BetaManagedAgentsModel = string or "claude-opus-5-5" or "claude-fable-5-1" or "claude-sonnet-5" or 12 more`
184 - `BetaManagedAgentsModel = "claude-sonnet-5-5" or "claude-opus-5-5" or "claude-fable-5-1" or 13 more or string`
185185
186186 The model that will power your agent.
187187
188188 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
189189
190 - `string`
190 - `"claude-sonnet-5-5" or "claude-opus-5-5" or "claude-fable-5-1" or 13 more`
191191
192 - `"claude-opus-5-5" or "claude-fable-5-1" or "claude-sonnet-5" or 12 more`
193
194192 The model that will power your agent.
195193
196194 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
197195
196 - `"claude-sonnet-5-5"`
197
198 Efficient model for coding and agents
199
198200 - `"claude-opus-5-5"`
199201
200202 Powerful intelligence for coding, knowledge work, and long-running agents
from line 207
205207
206208 - `"claude-sonnet-5"`
207209
208 High-performance model for coding and agents
210 Efficient model for coding and agents
209211
210212 - `"claude-fable-5"`
211213
from line 257
255257
256258 High-performance model for agents and coding
257259
260 - `string`
261
258262 - `BetaManagedAgentsModelConfigParams object`
259263
260264 An object that defines additional configuration control over model use
from line 1193
11891193
11901194 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
11911195
1192 - `string`
1196 - `"claude-sonnet-5-5" or "claude-opus-5-5" or "claude-fable-5-1" or 13 more`
11931197
1194 - `"claude-opus-5-5" or "claude-fable-5-1" or "claude-sonnet-5" or 12 more`
1195
11961198 The model that will power your agent.
11971199
11981200 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
11991201
1202 - `"claude-sonnet-5-5"`
1203
1204 Efficient model for coding and agents
1205
12001206 - `"claude-opus-5-5"`
12011207
12021208 Powerful intelligence for coding, knowledge work, and long-running agents
from line 1213
12071213
12081214 - `"claude-sonnet-5"`
12091215
1210 High-performance model for coding and agents
1216 Efficient model for coding and agents
12111217
12121218 - `"claude-fable-5"`
12131219
from line 1262
12561262 - `"claude-sonnet-4-5-20250929"`
12571263
12581264 High-performance model for agents and coding
1265
1266 - `string`
12591267
12601268 - `effort: optional BetaManagedAgentsEffortLow or BetaManagedAgentsEffortMedium or BetaManagedAgentsEffortHigh or 2 more`
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