Create a Message changedapi/beta/messages/create
Nearest release: v2.1.314, published 6 hours 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.
Recorded here
Lines+24added
Lines−0removed
From line
131
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First seen
14 Aug 2026
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Recorded edits31to this page, all time
The whole hunk
from line 131, old and new numbered
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from line 131
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132132 - `"webhooks-2026-10-07"`
133133
134 - `"message-threads-2026-08-12"`
135
136 - `"analytics-usage-cost-2026-08-24"`
137
134138- `"anthropic-user-profile-id": optional string`
135139
136140 The user profile ID to attribute this request to. Use when acting on behalf of a party other than your organization.
from line 4072
40684072
40694073 - `BetaThinkingConfigAdaptive object`
40704074
4075- `thread: optional BetaMessageThreadParam or null`
4076
4077 Server-held conversation state (a Thread). `{"type": "create"}` asks the server to hold this conversation's state under the response's `id`; `{"type": "continue", "previous_message_id": ...}` resumes from a previous response so only the new turn's messages are sent. The response shape is unchanged.
4078
4079 - `BetaThreadCreateParams object`
4080
4081 Start holding conversation state under this response's `id`.
4082
4083 - `type: "create"`
4084
4085 - `BetaThreadContinueParams object`
4086
4087 Resume from the response named by `previous_message_id`.
4088
4089 - `type: "continue"`
4090
4091 - `previous_message_id: string`
4092
4093 The `id` of the previous response in this Thread.
4094
40714095- `tool_choice: optional BetaToolChoice`
40724096
40734097 How the model should use the provided tools. The model can use a specific tool, any available tool, decide by itself, or not use tools at all.
from line 7044
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70217045 Powerful intelligence for coding, knowledge work, and long-running agents
70227046
7023 - `"claude-mythos-5-1"`
7024
7025 Our most capable model for cybersecurity and biology research, available through trusted access programs
7026
7027 - `"claude-sonnet-5"`
7028
7029 Efficient model for coding and agents
7030
7031 - `"claude-fable-5"`
7032
7033 Next generation of intelligence for the hardest knowledge work and coding problems
7034
7035 - `"claude-mythos-5"`
7036
7037 Most capable model for cybersecurity and biology research
7038
7039 - `"claude-opus-5"`
7040
7041 Powerful intelligence for long-running agents and coding
7042
7043 - `"claude-opus-4-8"`
7044
7045 Powerful intelligence for long-running agents and coding
7046
7047
7047
No line in this hunk matches that.