Create a Message changedapi/beta/messages/create
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Lines+22added
Lines−12removed
From line
119
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First seen
14 Aug 2026
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Recorded edits20to this page, all time
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from line 119, old and new numbered
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from line 119
119119
120120 - `"ce-plugins-2026-09-01"`
121121
122 - `"spend-limit-reads-2026-09-26"`
123
122124- `"anthropic-user-profile-id": optional string`
123125
124126 The user profile ID to attribute this request to. Use when acting on behalf of a party other than your organization. Requires the `user-profiles` beta header.
from line 3168
31663168
31673169 Powerful intelligence for long-running agents and coding
31683170
3171 - `"claude-mythos-preview"`
3172
3173 **Deprecated**: Will reach end-of-life on June 30, 2026. Please migrate to claude-mythos-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information.
3174
3175 New class of intelligence, strongest in coding and cybersecurity
3176
31693177 - `"claude-sonnet-4-5"`
31703178
3179 **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information.
3180
31713181 High-performance model for agents and coding
31723182
31733183 - `"claude-sonnet-4-5-20250929"`
31743184
3185 **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information.
3186
31753187 High-performance model for agents and coding
31763188
3177 - `"claude-mythos-preview"`
3178
3179 **Deprecated**: Will reach end-of-life on June 30, 2026. Please migrate to claude-mythos-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information.
3180
3181 New class of intelligence, strongest in coding and cybersecurity
3182
31833189 - `string`
31843190
31853191 - `name: "advisor"`
from line 7034
70287034
70297035 Powerful intelligence for long-running agents and coding
70307036
7037 - `"claude-mythos-preview"`
7038
7039 **Deprecated**: Will reach end-of-life on June 30, 2026. Please migrate to claude-mythos-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information.
7040
7041 New class of intelligence, strongest in coding and cybersecurity
7042
70317043 - `"claude-sonnet-4-5"`
70327044
7045 **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information.
7046
70337047 High-performance model for agents and coding
70347048
70357049 - `"claude-sonnet-4-5-20250929"`
70367050
7051 **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information.
7052
70377053 High-performance model for agents and coding
70387054
7039 - `"claude-mythos-preview"`
7040
7041 **Deprecated**: Will reach end-of-life on June 30, 2026. Please migrate to claude-mythos-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information.
7042
7043 New class of intelligence, strongest in coding and cybersecurity
7044
70457055 - `string`
70467056
70477057 - `name: "advisor"`
from line 7201
71917201
71927202 Default configuration applied to all tools from this server
71937203
7194 - `defer_loading: optional boolean`
7195
7196 - `enabled: optional boolean`
7197
7198 - `tools: optional array of BetaMCPToolParam or null`
7199
7200 The server's tool listing, pinned: when present, the server is not asked for its tools before sampling and exactly these entries, with `default_config` and `configs` applied, are the toolset's tools. Copy it from the `mcp_tool_listing` block of an earlier response.
7201
7202 - `input_schema: map[unknown]`
7203
7204 The tool's input schema as the MCP server lists it, verbatim.
7205
7206 - `name: string`
7207
7208 The tool's name as the MCP server lists it (not prefixed with the server name).
7209
7210 minLength: 1
7211
7212 - `description: optional string or null`
7213
7214 The tool's description as the MCP server lists it.
7215
7204 - `
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