Get Session changedapi/beta/sessions/retrieve
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Lines−250removed
From line
163
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14 Aug 2026
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Recorded edits11to this page, all time
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163163
164164 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
165165
166 - `string`
167
166168 - `"claude-opus-5-5" or "claude-fable-5-1" or "claude-sonnet-5" or 12 more`
167169
168170 The model that will power your agent.
from line 231
229231
230232 High-performance model for agents and coding
231233
232 - `string`
233
234234 - `effort: optional BetaManagedAgentsEffortLow or BetaManagedAgentsEffortMedium or BetaManagedAgentsEffortHigh or 2 more`
235235
236 How hard Claude works on each turn. Sets `output_config.effort` on every Messages call the session makes.
236 How hard Claude works on each inference call. One of `low`, `medium`, `high`, `xhigh`, `max`. Always present; resolved to the per-model default at save time when not supplied.
237237
238238 - `BetaManagedAgentsEffortLow object`
239239
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271271
272272 - `speed: optional "standard" or "fast"`
273273
274 Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Not all models support `fast`; invalid combinations are rejected at create time.
274 Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Defaults to `standard`. Not all models support `fast`; invalid combinations are rejected at create time.
275275
276276 - `"standard"`
277277
from line 279
279279
280280 - `multiagent: BetaManagedAgentsSessionMultiagentCoordinator or null`
281281
282 Resolved coordinator topology with full agent definitions for each roster member.
282 Resolved multiagent orchestration configuration. Null when the agent is single-threaded.
283283
284284 - `type: "coordinator"`
285285
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735735
736736 - `archived_at: string or null`
737737
738 A timestamp in RFC 3339 format
738 When the session was archived. Null if not archived.
739739
740740 format: date-time
741741
742742 - `budget: BetaManagedAgentsBudgetLimit or null`
743743
744 A hard spend ceiling. The session stops issuing new model requests once the tracked list cost reaches `max_list_cost`.
744 The session's enforced spend ceiling, or null when no budget is set.
745745
746746 - `type: "limit"`
747747
748748 - `max_list_cost: BetaMonetaryAmount`
749749
750 A monetary amount in a specific currency.
750 Maximum list cost the session may accrue. List price is used regardless of any negotiated discount, so the cap fires at or before the actual charge.
751751
752752 - `amount: string`
753753
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775775
776776 - `completed_at: string or null`
777777
778 A timestamp in RFC 3339 format
778 When the outcome reached a terminal result. Null while `pending`/`running`/`evaluating`.
779779
780780 format: date-time
781781
from line 881
881881
882882 - `access: optional "read_write" or "read_only" or null`
883883
884 Access mode for an attached memory store.
884 Access mode for the mounted store. Defaults to `read_write`. `read_only` mounts the store as a read-only filesystem.
885885
886886 - `"read_write"`
887887
from line 907
907907
908908 - `stats: BetaManagedAgentsSessionStats`
909909
910 Timing statistics for a session.
910 Timing statistics for the session.
911911
912912 - `active_seconds: optional number`
913913
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951951
952952 - `usage: BetaManagedAgentsSessionUsage`
953953
954 Cumulative token usage for a session across all turns.
954 Cumulative token usage for the session.
955955
956956 - `active_seconds: optional number`
957957
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961961
962962 - `cache_creation: optional BetaManagedAgentsCacheCreationUsage`
963963
964 Prompt-cache creation token usage broken down by cache lifetime.
964 Tokens used to create prompt cache entries, broken down by cache TTL.
965965
966966 - `ephemeral_1h_input_tokens: optional number`
967967
from line 989
989989
990990 - `list_cost: optional BetaMonetaryAmount or null`
991991
992 A monetary amount in a specific currency.
992 Cumulative list cost of the session across all turns, priced at public list rates. Absent until cost tracking is available for the session.
993993
994994 - `output_tokens: optional number`
995995
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999999
10001000 - `server_tool_use: optional BetaManagedAgentsServerToolUsage or null`
10011001
1002 Cumulative count of server-executed tool invocations, broken down by tool.
1002 Cumulative server-executed tool usage across all turns. Absent until server-tool tracking is available for the session.
10031003
10041004 - `web_fetch_requests: optional number`
10051005
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