Messages changedapi/beta/messages
Nearest release: v2.1.286, 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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Lines−3,692removed
From line
23
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 23, old and new numbered
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from line 23
2323
2424 - `string`
2525
26 - `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 45 more`
26 - `"message-batches-2024-09-24"`
2727
28 - `"message-batches-2024-09-24"`
28 - `"prompt-caching-2024-07-31"`
2929
30 - `"prompt-caching-2024-07-31"`
30 - `"computer-use-2024-10-22"`
3131
32 - `"computer-use-2024-10-22"`
32 - `"computer-use-2025-01-24"`
3333
34 - `"computer-use-2025-01-24"`
34 - `"pdfs-2024-09-25"`
3535
36 - `"pdfs-2024-09-25"`
36 - `"token-counting-2024-11-01"`
3737
38 - `"token-counting-2024-11-01"`
38 - `"token-efficient-tools-2025-02-19"`
3939
40 - `"token-efficient-tools-2025-02-19"`
40 - `"output-128k-2025-02-19"`
4141
42 - `"output-128k-2025-02-19"`
42 - `"files-api-2025-04-14"`
4343
44 - `"files-api-2025-04-14"`
44 - `"mcp-client-2025-04-04"`
4545
46 - `"mcp-client-2025-04-04"`
46 - `"mcp-client-2025-11-20"`
4747
48 - `"mcp-client-2025-11-20"`
48 - `"dev-full-thinking-2025-05-14"`
4949
50 - `"dev-full-thinking-2025-05-14"`
50 - `"interleaved-thinking-2025-05-14"`
5151
52 - `"interleaved-thinking-2025-05-14"`
52 - `"code-execution-2025-05-22"`
5353
54 - `"code-execution-2025-05-22"`
54 - `"extended-cache-ttl-2025-04-11"`
5555
56 - `"extended-cache-ttl-2025-04-11"`
56 - `"context-1m-2025-08-07"`
5757
58 - `"context-1m-2025-08-07"`
58 - `"context-management-2025-06-27"`
5959
60 - `"context-management-2025-06-27"`
60 - `"model-context-window-exceeded-2025-08-26"`
6161
62 - `"model-context-window-exceeded-2025-08-26"`
62 - `"skills-2025-10-02"`
6363
64 - `"skills-2025-10-02"`
64 - `"fast-mode-2026-02-01"`
6565
66 - `"fast-mode-2026-02-01"`
66 - `"output-300k-2026-03-24"`
6767
68 - `"output-300k-2026-03-24"`
68 - `"user-profiles-2026-03-24"`
6969
70 - `"user-profiles-2026-03-24"`
70 - `"user-profiles-2026-08-18"`
7171
72 - `"user-profiles-2026-08-18"`
72 - `"user-profiles-2026-09-04"`
7373
74 - `"user-profiles-2026-09-04"`
74 - `"advisor-tool-2026-03-01"`
7575
76 - `"advisor-tool-2026-03-01"`
76 - `"managed-agents-2026-04-01"`
7777
78 - `"managed-agents-2026-04-01"`
78 - `"cache-diagnosis-2026-04-07"`
7979
80 - `"cache-diagnosis-2026-04-07"`
80 - `"dreaming-2026-04-21"`
8181
82 - `"dreaming-2026-04-21"`
82 - `"thinking-token-count-2026-05-13"`
8383
84 - `"thinking-token-count-2026-05-13"`
84 - `"server-side-fallback-2026-06-01"`
8585
86 - `"server-side-fallback-2026-06-01"`
86 - `"server-side-fallback-2026-07-01"`
8787
88 - `"server-side-fallback-2026-07-01"`
88 - `"fallback-credit-2026-06-01"`
8989
90 - `"fallback-credit-2026-06-01"`
90 - `"fallback-credit-2026-07-01"`
9191
92 - `"fallback-credit-2026-07-01"`
92 - `"agent-memory-2026-07-22"`
9393
94 - `"agent-memory-2026-07-22"`
94 - `"mid-conversation-tool-changes-2026-07-01"`
9595
96 - `"mid-conversation-tool-changes-2026-07-01"`
96 - `"compact-2026-01-12"`
9797
98 - `"compact-2026-01-12"`
98 - `"computer-use-2025-11-24"`
9999
100 - `"computer-use-2025-11-24"`
100 - `"mcp-tunnels-2026-06-22"`
101101
102 - `"mcp-tunnels-2026-06-22"`
102 - `"structured-outputs-2025-11-13"`
103103
104 - `"structured-outputs-2025-11-13"`
104 - `"task-budgets-2026-03-13"`
105105
106 - `"task-budgets-2026-03-13"`
106 - `"thinking-display-updates-2026-08-18"`
107107
108 - `"thinking-display-updates-2026-08-18"`
108 - `"ce-user-management-2026-07-13"`
109109
110 - `"ce-user-management-2026-07-13"`
110 - `"mid-conversation-output-config-2026-07-01"`
111111
112 - `"mid-conversation-output-config-2026-07-01"`
112 - `"thinking-binding-controls-2026-08-01"`
113113
114 - `"thinking-binding-controls-2026-08-01"`
114 - `"mid-conversation-system-clear-at-2026-08-21"`
115115
116 - `"mid-conversation-system-clear-at-2026-08-21"`
116 - `"compact-2026-09-04"`
117117
118 - `"compact-2026-09-04"`
118 - `"inline-tools-2026-09-15"`
119119
120 - `"inline-tools-2026-09-15"`
120 - `"mcp-client-2026-09-15"`
121121
122 - `"mcp-client-2026-09-15"`
123
124122- `"anthropic-user-profile-id": optional string`
125123
126124 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 3102
31043102
31053103 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
31063104
3107 - `"claude-sonnet-5-5" or "claude-fable-5-1" or "claude-opus-5-5" or 16 more`
3105 - `"claude-sonnet-5-5"`
31083106
3109 The model that will complete your prompt.
3107 Efficient model for coding and agents
31103108
3111 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
3109 - `"claude-fable-5-1"`
31123110
3113 - `"claude-sonnet-5-5"`
3111 Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows
31143112
3115 Efficient model for coding and agents
3113 - `"claude-opus-5-5"`
31163114
3117 - `"claude-fable-5-1"`
3115 Powerful intelligence for coding, knowledge work, and long-running agents
31183116
3119 Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows
3117 - `"claude-mythos-5-1"`
31203118
3121 - `"claude-opus-5-5"`
3119 Our most capable model for cybersecurity and biology research, available through trusted access programs
31223120
3123 Powerful intelligence for coding, knowledge work, and long-running agents
3121 - `"claude-sonnet-5"`
31243122
3125 - `"claude-mythos-5-1"`
3123 Efficient model for coding and agents
31263124
3127 Our most capable model for cybersecurity and biology research, available through trusted access programs
3125 - `"claude-fable-5"`
31283126
3129 - `"claude-sonnet-5"`
3127 Next generation of intelligence for the hardest knowledge work and coding problems
31303128
3131 Efficient model for coding and agents
3129 - `"claude-mythos-5"`
31323130
3133 - `"claude-fable-5"`
3131 Most capable model for cybersecurity and biology research
31343132
3135 Next generation of intelligence for the hardest knowledge work and coding problems
3133 - `"claude-opus-5"`
31363134
3137 - `"claude-mythos-5"`
3135 Powerful intelligence for long-running agents and coding
31383136
3139 Most capable model for cybersecurity and biology research
3137 - `"claude-opus-4-8"`
31403138
3141 - `"claude-opus-5"`
3139 Powerful intelligence for long-running agents and coding
31423140
3143 Powerful intelligence for long-running agents and coding
3141 - `"claude-opus-4-7"`
31443142
3145 - `"claude-opus-4-8"`
3143 Powerful intelligence for long-running agents and coding
31463144
3147 Powerful intelligence for long-running agents and coding
3145 - `"claude-opus-4-6"`
31483146
3149 - `"claude-opus-4-7"`
3147 Powerful intelligence for long-running agents and coding
31503148
3151 Powerful intelligence for long-running agents and coding
3149 - `"claude-sonnet-4-6"`
31523150
3153 - `"claude-opus-4-6"`
3151 Best combination of speed and intelligence
31543152
3155 Powerful intelligence for long-running agents and coding
3153 - `"claude-haiku-4-5"`
31563154
3157 - `"claude-sonnet-4-6"`
3155 Fastest model with near-frontier intelligence
31583156
3159 Best combination of speed and intelligence
3157 - `"claude-haiku-4-5-20251001"`
31603158
3161 - `"claude-haiku-4-5"`
3159 Fastest model with near-frontier intelligence
31623160
3163 Fastest model with near-frontier intelligence
3161 - `"claude-opus-4-5"`
31643162
3165 - `"claude-haiku-4-5-20251001"`
3163 Powerful intelligence for long-running agents and coding
31663164
3167 Fastest model with near-frontier intelligence
3165 - `"claude-opus-4-5-20251101"`
31683166
3169 - `"claude-opus-4-5"`
3167 Powerful intelligence for long-running agents and coding
31703168
3171 Powerful intelligence for long-running agents and coding
3169 - `"claude-sonnet-4-5"`
31723170
3173 - `"claude-opus-4-5-20251101"`
3171 High-performance model for agents and coding
31743172
3175 Powerful intelligence for long-running agents and coding
3173 - `"claude-sonnet-4-5-20250929"`
31763174
3177 - `"claude-sonnet-4-5"`
3175 High-performance model for agents and coding
31783176
3179 High-performance model for agents and coding
3177 - `"claude-mythos-preview"`
31803178
3181 - `"claude-sonnet-4-5-20250929"`
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.
31823180
3183 High-performance model for agents and coding
3181 New class of intelligence, strongest in coding and cybersecurity
31843182
3185 - `"claude-mythos-preview"`
3186
3187 **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.
3188
3189 New class of intelligence, strongest in coding and cybersecurity
3190
31913183 - `string`
31923184
31933185 - `name: "advisor"`
from line 3880
38883880
38893881 - `"updates"`
38903882
3891 - `Default = "default"`
3883 - `"default"`
38923884
38933885- `inference_geo: optional string or null`
38943886
from line 6964
69726964
69736965 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
69746966
6975 - `"claude-sonnet-5-5" or "claude-fable-5-1" or "claude-opus-5-5" or 16 more`
6967 - `"claude-sonnet-5-5"`
69766968
6977 The model that will complete your prompt.
6969 Efficient model for coding and agents
69786970
6979 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
6971 - `"claude-fable-5-1"`
69806972
6981 - `"claude-sonnet-5-5"`
6973 Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows
69826974
6983 Efficient model for coding and agents
6975 - `"claude-opus-5-5"`
69846976
6985 - `"claude-fable-5-1"`
6977 Powerful intelligence for coding, knowledge work, and long-running agents
69866978
6987 Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows
6979 - `"claude-mythos-5-1"`
69886980
6989 - `"claude-opus-5-5"`
6981 Our most capable model for cybersecurity and biology research, available through trusted access programs
69906982
6991 Powerful intelligence for coding, knowledge work, and long-running agents
6983 - `"claude-sonnet-5"`
69926984
6993 - `"claude-mythos-5-1"`
6985 Efficient model for coding and agents
69946986
6995 Our most capable model for cybersecurity and biology research, available through trusted access programs
6987 - `"claude-fable-5"`
69966988
6997 - `"claude-sonnet-5"`
6989 Next generation of intelligence for the hardest knowledge work and coding problems
69986990
6999 Efficient model for coding and agents
6991 - `"claude-mythos-5"`
70006992
7001 - `"claude-fable-5"`
6993 Most capable model for cybersecurity and biology research
70026994
7003 Next generation of intelligence for the hardest knowledge work and coding problems
6995 - `"claude-opus-5"`
70046996
7005 - `"claude-mythos-5"`
6997 Powerful intelligence for long-running agents and coding
70066998
7007 Most capable model for cybersecurity and biology research
6999 - `"claude-opus-4-8"`
70087000
7009 - `"claude-opus-5"`
7001 Powerful intelligence for long-running agents and coding
70107002
7011 Powerful intelligence for long-running agents and coding
7003 - `"claude-opus-4-7"`
70127004
7013 - `"claude-opus-4-8"`
7005 Powerful intelligence for long-running agents and coding
70147006
7015 Powerful intelligence for long-running agents and coding
7007 - `"claude-opus-4-6"`
70167008
7017 - `"claude-opus-4-7"`
7009 Powerful intelligence for long-running agents and coding
70187010
7019 Powerful intelligence for long-running agents and coding
7011 - `"claude-sonnet-4-6"`
70207012
7021 - `"claude-opus-4-6"`
7013 Best combination of speed and intelligence
70227014
7023 Powerful intelligence for long-running agents and coding
7015 - `"claude-haiku-4-5"`
70247016
7025 - `"claude-sonnet-4-6"`
7017 Fastest model with near-frontier intelligence
70267018
7027 Best combination of speed and intelligence
7019 - `"claude-haiku-4-5-20251001"`
70287020
7029 - `"claude-haiku-4-5"`
7021 Fastest model with near-frontier intelligence
70307022
7031 Fastest model with near-frontier intelligence
7023 - `"claude-opus-4-5"`
70327024
7033 - `"claude-haiku-4-5-20251001"`
7025 Powerful intelligence for long-running agents and coding
70347026
7035 Fastest model with near-frontier intelligence
7027 - `"claude-opus-4-5-20251101"`
70367028
7037 - `"claude-opus-4-5"`
7029 Powerful intelligence for long-running agents and coding
70387030
7039 Powerful intelligence for long-running agents and coding
7031 - `"claude-sonnet-4-5"`
70407032
7041 - `"claude-opus-4-5-20251101"`
7033 High-performance model for agents and coding
70427034
7043 Powerful intelligence for long-running agents and coding
7035 - `"claude-sonnet-4-5-20250929"`
70447036
7045 - `"claude-sonnet-4-5"`
7037 High-performance model for agents and coding
70467038
7047 High-performance model for agents and coding
7039 - `"claude-mythos-preview"`
70487040
7049 - `"claude-sonnet-4-5-20250929"`
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.
70507042
7051 High-performance model for agents and coding
7043 New class of intelligence, strongest in coding and cybersecurity
70527044
7053 - `"claude-mythos-preview"`
7054
7055 **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.
7056
7057 New class of intelligence, strongest in coding and cybersecurity
7058
70597045 - `string`
70607046
70617047 - `name: "advisor"`
from line 7189
72037189
72047190 - `default_config: optional BetaMCPToolDefaultConfig`
72057191
7206 Default configuration applied to all tools from this serv
7192 Default configuration applied to all tools from this server
7193
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
7216 - `BetaResponseToolRe
No line in this hunk matches that.