Messages changedapi/beta/messages
Nearest release: v2.1.287, published 4 hours before 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+558added
Lines−406removed
From line
121
where the diff opens
First seen
14 Aug 2026
this site's first read of the page
Recorded edits20to this page, all time
The whole hunk
from line 121, old and new numbered
/
This page is larger than the 256 KiB this site keeps, so one side of the diff below stops where the stored text does.
from line 121
121121
122122 - `"ce-plugins-2026-09-01"`
123123
124 - `"spend-limit-reads-2026-09-26"`
125
124126- `"anthropic-user-profile-id": optional string`
125127
126128 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 3170
31683170
31693171 Powerful intelligence for long-running agents and coding
31703172
3173 - `"claude-mythos-preview"`
3174
3175 **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.
3176
3177 New class of intelligence, strongest in coding and cybersecurity
3178
31713179 - `"claude-sonnet-4-5"`
31723180
3181 **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.
3182
31733183 High-performance model for agents and coding
31743184
31753185 - `"claude-sonnet-4-5-20250929"`
31763186
3187 **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.
3188
31773189 High-performance model for agents and coding
31783190
3179 - `"claude-mythos-preview"`
3180
3181 **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.
3182
3183 New class of intelligence, strongest in coding and cybersecurity
3184
31853191 - `string`
31863192
31873193 - `name: "advisor"`
from line 7036
70307036
70317037 Powerful intelligence for long-running agents and coding
70327038
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
70337045 - `"claude-sonnet-4-5"`
70347046
7047 **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.
7048
70357049 High-performance model for agents and coding
70367050
70377051 - `"claude-sonnet-4-5-20250929"`
70387052
7053 **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.
7054
70397055 High-performance model for agents and coding
70407056
7041 - `"claude-mythos-preview"`
7042
7043 **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.
7044
7045 New class of intelligence, strongest in coding and cybersecurity
7046
70477057 - `string`
70487058
70497059 - `name: "advisor"`
from line 7203
71937203
71947204 Default configuration applied to all tools from this server
71957205
7196 - `defer_loading: optional boolean`
7197
7198 - `enabled: optional boolean`
7199
7200 - `tools: optional array of BetaMCPToolParam or null`
7201
7202 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.
7203
7204 - `input_schema: map[unknown]`
7205
7206 The tool's input schema as the MCP server lists it, verbatim.
7207
7208 - `name: string`
7209
7210 The tool's name as the MCP server lists it (not prefixed with the server name).
7211
7212 minLength: 1
7213
7214 - `description: optional string or null`
7215
7216 The tool's description as the MCP server lists it.
7206 -
No line in this hunk matches that.