Update Session changedapi/beta/sessions/update
Nearest release: v2.1.258, published an hour after this site recorded the change. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.
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14 Aug 2026
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Recorded edits26to this page, all time
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1717 - `string`
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19 - `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 38 more`
19 - `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 41 more`
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2121 - `"message-batches-2024-09-24"`
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101101 - `"ce-user-management-2026-07-13"`
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103 - `"mid-conversation-output-config-2026-07-01"`
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105 - `"thinking-binding-controls-2026-08-01"`
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107 - `"mid-conversation-system-clear-at-2026-08-21"`
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103109## Body parameters
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105111- `agent: optional BetaManagedAgentsSessionAgentUpdate`
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575581 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
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577 - `"claude-sonnet-5" or "claude-fable-5" or "claude-opus-5" or 10 more`
583 - `"claude-fable-5-1" or "claude-sonnet-5" or "claude-fable-5" or 11 more`
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579585 The model that will power your agent.
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581587 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
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589 - `"claude-fable-5-1"`
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591 Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows
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583593 - `"claude-sonnet-5"`
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585595 High-performance model for coding and agents
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11291139 - `outcome_evaluations: array of BetaManagedAgentsOutcomeEvaluationResource`
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1131 Per-outcome evaluation state. One entry per define_outcome event sent to the session.
1141 Per-outcome evaluation state. One entry per `define_outcome` event sent to the session.
11321142
11331143 - `completed_at: string or null`
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11431153 - `explanation: string or null`
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1145 Grader's verdict text from the most recent evaluation. For satisfied, explains why criteria are met; for needs_revision (intermediate), what's missing; for failed, why unrecoverable.
1155 Grader's verdict text from the most recent evaluation. For `satisfied`, explains why criteria are met; for `needs_revision` (intermediate), what's missing; for `failed`, why unrecoverable.
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11471157 - `iteration: number`
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12701280
12711281 - `active_seconds: optional number`
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1273 Cumulative time in seconds the session spent in running status. Excludes idle time.
1283 Cumulative time in seconds the session spent in `running` status. Excludes idle time.
12741284
12751285 format: double
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