Messages changedapi/beta/messages
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Lines+114added
Lines−0removed
From line
133
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First seen
14 Aug 2026
this site's first read of the page
Recorded edits31to this page, all time
### Beta Message Thread Param ### Beta Thread Continue Params ### Beta Thread Create Params
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from line 133, old and new numbered
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from line 133
133133
134134 - `"webhooks-2026-10-07"`
135135
136 - `"message-threads-2026-08-12"`
137
138 - `"analytics-usage-cost-2026-08-24"`
139
136140- `"anthropic-user-profile-id": optional string`
137141
138142 The user profile ID to attribute this request to. Use when acting on behalf of a party other than your organization.
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40704074
40714075 - `BetaThinkingConfigAdaptive object`
40724076
4077- `thread: optional BetaMessageThreadParam or null`
4078
4079 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.
4080
4081 - `BetaThreadCreateParams object`
4082
4083 Start holding conversation state under this response's `id`.
4084
4085 - `type: "create"`
4086
4087 - `BetaThreadContinueParams object`
4088
4089 Resume from the response named by `previous_message_id`.
4090
4091 - `type: "continue"`
4092
4093 - `previous_message_id: string`
4094
4095 The `id` of the previous response in this Thread.
4096
40734097- `tool_choice: optional BetaToolChoice`
40744098
40754099 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 7046
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70237047 Powerful intelligence for coding, knowledge work, and long-running agents
70247048
7025 - `"claude-mythos-5-1"`
7026
7027 Our most capable model for cybersecurity and biology research, available through trusted access programs
7028
7029 - `"claude-sonnet-5"`
7030
7031 Efficient model for coding and agents
7032
7033 - `"claude-fable-5"`
7034
7035 Next generation of intelligence for the hardest knowledge work and coding problems
7036
7037 - `"claude-mythos-5"`
7038
7039 Most capable model for cybersecurity and biology research
7040
7041 - `"claude-opus-5"`
7042
7043 Powerful intelligence for long-running agents and coding
7044
7045 - `"claude-opus-4-8"`
7046
7047 Powerful intelligence for long-running agents and coding
7048
7049
7049
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