Create Agent changedapi/beta/agents/create
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128128 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
129129
130 - `BetaManagedAgentsModel = string or "claude-opus-5-5" or "claude-fable-5-1" or "claude-sonnet-5" or 12 more`
130 - `BetaManagedAgentsModel = "claude-sonnet-5-5" or "claude-opus-5-5" or "claude-fable-5-1" or 13 more or string`
131131
132132 The model that will power your agent.
133133
134134 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
135135
136 - `string`
136 - `"claude-sonnet-5-5" or "claude-opus-5-5" or "claude-fable-5-1" or 13 more`
137137
138 - `"claude-opus-5-5" or "claude-fable-5-1" or "claude-sonnet-5" or 12 more`
139
140138 The model that will power your agent.
141139
142140 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
143141
142 - `"claude-sonnet-5-5"`
143
144 Efficient model for coding and agents
145
144146 - `"claude-opus-5-5"`
145147
146148 Powerful intelligence for coding, knowledge work, and long-running agents
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152154 - `"claude-sonnet-5"`
153155
154 High-performance model for coding and agents
156 Efficient model for coding and agents
155157
156158 - `"claude-fable-5"`
157159
from line 203
201203
202204 High-performance model for agents and coding
203205
206 - `string`
207
204208 - `BetaManagedAgentsModelConfigParams object`
205209
206210 An object that defines additional configuration control over model use
from line 887
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884888 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
885889
886 - `string`
890 - `"claude-sonnet-5-5" or "claude-opus-5-5" or "claude-fable-5-1" or 13 more`
887891
888 - `"claude-opus-5-5" or "claude-fable-5-1" or "claude-sonnet-5" or 12 more`
889
890892 The model that will power your agent.
891893
892894 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
893895
896 - `"claude-sonnet-5-5"`
897
898 Efficient model for coding and agents
899
894900 - `"claude-opus-5-5"`
895901
896902 Powerful intelligence for coding, knowledge work, and long-running agents
from line 907
901907
902908 - `"claude-sonnet-5"`
903909
904 High-performance model for coding and agents
910 Efficient model for coding and agents
905911
906912 - `"claude-fable-5"`
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from line 956
950956 - `"claude-sonnet-4-5-20250929"`
951957
952958 High-performance model for agents and coding
959
960 - `string`
953961
954962 - `effort: optional BetaManagedAgentsEffortLow or BetaManagedAgentsEffortMedium or BetaManagedAgentsEffortHigh or 2 more`
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