Update Agent changedapi/beta/agents/update
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162162 Model identifier. Accepts the [model string](https://platform.claude.com/docs/en/about-claude/models/overview#latest-models-comparison), e.g. `claude-opus-5`, or a `model_config` object for additional configuration control. Omit to preserve. Cannot be cleared.
163163
164 - `BetaManagedAgentsModel = string or "claude-opus-5-5" or "claude-fable-5-1" or "claude-sonnet-5" or 12 more`
164 - `BetaManagedAgentsModel = "claude-sonnet-5-5" or "claude-opus-5-5" or "claude-fable-5-1" or 13 more or string`
165165
166166 The model that will power your agent.
167167
168168 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
169169
170 - `string`
170 - `"claude-sonnet-5-5" or "claude-opus-5-5" or "claude-fable-5-1" or 13 more`
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172 - `"claude-opus-5-5" or "claude-fable-5-1" or "claude-sonnet-5" or 12 more`
173
174172 The model that will power your agent.
175173
176174 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
177175
176 - `"claude-sonnet-5-5"`
177
178 Efficient model for coding and agents
179
178180 - `"claude-opus-5-5"`
179181
180182 Powerful intelligence for coding, knowledge work, and long-running agents
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185187
186188 - `"claude-sonnet-5"`
187189
188 High-performance model for coding and agents
190 Efficient model for coding and agents
189191
190192 - `"claude-fable-5"`
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235237
236238 High-performance model for agents and coding
237239
240 - `string`
241
238242 - `BetaManagedAgentsModelConfigParams object`
239243
240244 An object that defines additional configuration control over model use
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895899
896900 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
897901
898 - `string`
902 - `"claude-sonnet-5-5" or "claude-opus-5-5" or "claude-fable-5-1" or 13 more`
899903
900 - `"claude-opus-5-5" or "claude-fable-5-1" or "claude-sonnet-5" or 12 more`
901
902904 The model that will power your agent.
903905
904906 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
905907
908 - `"claude-sonnet-5-5"`
909
910 Efficient model for coding and agents
911
906912 - `"claude-opus-5-5"`
907913
908914 Powerful intelligence for coding, knowledge work, and long-running agents
from line 919
913919
914920 - `"claude-sonnet-5"`
915921
916 High-performance model for coding and agents
922 Efficient model for coding and agents
917923
918924 - `"claude-fable-5"`
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962968 - `"claude-sonnet-4-5-20250929"`
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964970 High-performance model for agents and coding
971
972 - `string`
965973
966974 - `effort: optional BetaManagedAgentsEffortLow or BetaManagedAgentsEffortMedium or BetaManagedAgentsEffortHigh or 2 more`
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