List Sessions changedapi/beta/sessions/list
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245245
246246 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
247247
248 - `string`
249
248250 - `"claude-opus-5-5" or "claude-fable-5-1" or "claude-sonnet-5" or 12 more`
249251
250252 The model that will power your agent.
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312314 High-performance model for agents and coding
313315
314 - `string`
315
316316 - `effort: optional BetaManagedAgentsEffortLow or BetaManagedAgentsEffortMedium or BetaManagedAgentsEffortHigh or 2 more`
317317
318 How hard Claude works on each turn. Sets `output_config.effort` on every Messages call the session makes.
318 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.
319319
320320 - `BetaManagedAgentsEffortLow object`
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353353
354354 - `speed: optional "standard" or "fast"`
355355
356 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.
356 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.
357357
358358 - `"standard"`
359359
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361361
362362 - `multiagent: BetaManagedAgentsSessionMultiagentCoordinator or null`
363363
364 Resolved coordinator topology with full agent definitions for each roster member.
364 Resolved multiagent orchestration configuration. Null when the agent is single-threaded.
365365
366366 - `type: "coordinator"`
367367
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817817
818818 - `archived_at: string or null`
819819
820 A timestamp in RFC 3339 format
820 When the session was archived. Null if not archived.
821821
822822 format: date-time
823823
824824 - `budget: BetaManagedAgentsBudgetLimit or null`
825825
826 A hard spend ceiling. The session stops issuing new model requests once the tracked list cost reaches `max_list_cost`.
826 The session's enforced spend ceiling, or null when no budget is set.
827827
828828 - `type: "limit"`
829829
830830 - `max_list_cost: BetaMonetaryAmount`
831831
832 A monetary amount in a specific currency.
832 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.
833833
834834 - `amount: string`
835835
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857857
858858 - `completed_at: string or null`
859859
860 A timestamp in RFC 3339 format
860 When the outcome reached a terminal result. Null while `pending`/`running`/`evaluating`.
861861
862862 format: date-time
863863
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963963
964964 - `access: optional "read_write" or "read_only" or null`
965965
966 Access mode for an attached memory store.
966 Access mode for the mounted store. Defaults to `read_write`. `read_only` mounts the store as a read-only filesystem.
967967
968968 - `"read_write"`
969969
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989989
990990 - `stats: BetaManagedAgentsSessionStats`
991991
992 Timing statistics for a session.
992 Timing statistics for the session.
993993
994994 - `active_seconds: optional number`
995995
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10331033
10341034 - `usage: BetaManagedAgentsSessionUsage`
10351035
1036 Cumulative token usage for a session across all turns.
1036 Cumulative token usage for the session.
10371037
10381038 - `active_seconds: optional number`
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10431043
10441044 - `cache_creation: optional BetaManagedAgentsCacheCreationUsage`
10451045
1046 Prompt-cache creation token usage broken down by cache lifetime.
1046 Tokens used to create prompt cache entries, broken down by cache TTL.
10471047
10481048 - `ephemeral_1h_input_tokens: optional number`
10491049
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10711071
10721072 - `list_cost: optional BetaMonetaryAmount or null`
10731073
1074 A monetary amount in a specific currency.
1074 Cumulative list cost of the session across all turns, priced at public list rates. Absent until cost tracking is available for the session.
10751075
10761076 - `output_tokens: optional number`
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10811081
10821082 - `server_tool_use: optional BetaManagedAgentsServerToolUsage or null`
10831083
1084 Cumulative count of server-executed tool invocations, broken down by tool.
1084 Cumulative server-executed tool usage across all turns. Absent until server-tool tracking is available for the session.
10851085
10861086 - `web_fetch_requests: optional number`
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