Create a Message changedapi/messages/create
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Lines+154added
Lines−166removed
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1,073
where the diff opens
First seen
14 Aug 2026
this site's first read of the page
Recorded edits16to this page, all time
The whole hunk
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10731073
10741074 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
10751075
1076 - `"claude-sonnet-5-5" or "claude-fable-5-1" or "claude-opus-5-5" or 16 more`
1076 - `"claude-sonnet-5-5"`
10771077
1078 The model that will complete your prompt.
1078 Efficient model for coding and agents
10791079
1080 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
1080 - `"claude-fable-5-1"`
10811081
1082 - `"claude-sonnet-5-5"`
1082 Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows
10831083
1084 Efficient model for coding and agents
1084 - `"claude-opus-5-5"`
10851085
1086 - `"claude-fable-5-1"`
1086 Powerful intelligence for coding, knowledge work, and long-running agents
10871087
1088 Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows
1088 - `"claude-mythos-5-1"`
10891089
1090 - `"claude-opus-5-5"`
1090 Our most capable model for cybersecurity and biology research, available through trusted access programs
10911091
1092 Powerful intelligence for coding, knowledge work, and long-running agents
1092 - `"claude-sonnet-5"`
10931093
1094 - `"claude-mythos-5-1"`
1094 Efficient model for coding and agents
10951095
1096 Our most capable model for cybersecurity and biology research, available through trusted access programs
1096 - `"claude-fable-5"`
10971097
1098 - `"claude-sonnet-5"`
1098 Next generation of intelligence for the hardest knowledge work and coding problems
10991099
1100 Efficient model for coding and agents
1100 - `"claude-mythos-5"`
11011101
1102 - `"claude-fable-5"`
1102 Most capable model for cybersecurity and biology research
11031103
1104 Next generation of intelligence for the hardest knowledge work and coding problems
1104 - `"claude-opus-5"`
11051105
1106 - `"claude-mythos-5"`
1106 Powerful intelligence for long-running agents and coding
11071107
1108 Most capable model for cybersecurity and biology research
1108 - `"claude-opus-4-8"`
11091109
1110 - `"claude-opus-5"`
1110 Powerful intelligence for long-running agents and coding
11111111
1112 Powerful intelligence for long-running agents and coding
1112 - `"claude-opus-4-7"`
11131113
1114 - `"claude-opus-4-8"`
1114 Powerful intelligence for long-running agents and coding
11151115
1116 Powerful intelligence for long-running agents and coding
1116 - `"claude-opus-4-6"`
11171117
1118 - `"claude-opus-4-7"`
1118 Powerful intelligence for long-running agents and coding
11191119
1120 Powerful intelligence for long-running agents and coding
1120 - `"claude-sonnet-4-6"`
11211121
1122 - `"claude-opus-4-6"`
1122 Best combination of speed and intelligence
11231123
1124 Powerful intelligence for long-running agents and coding
1124 - `"claude-haiku-4-5"`
11251125
1126 - `"claude-sonnet-4-6"`
1126 Fastest model with near-frontier intelligence
11271127
1128 Best combination of speed and intelligence
1128 - `"claude-haiku-4-5-20251001"`
11291129
1130 - `"claude-haiku-4-5"`
1130 Fastest model with near-frontier intelligence
11311131
1132 Fastest model with near-frontier intelligence
1132 - `"claude-opus-4-5"`
11331133
1134 - `"claude-haiku-4-5-20251001"`
1134 Powerful intelligence for long-running agents and coding
11351135
1136 Fastest model with near-frontier intelligence
1136 - `"claude-opus-4-5-20251101"`
11371137
1138 - `"claude-opus-4-5"`
1138 Powerful intelligence for long-running agents and coding
11391139
1140 Powerful intelligence for long-running agents and coding
1140 - `"claude-sonnet-4-5"`
11411141
1142 - `"claude-opus-4-5-20251101"`
1142 High-performance model for agents and coding
11431143
1144 Powerful intelligence for long-running agents and coding
1144 - `"claude-sonnet-4-5-20250929"`
11451145
1146 - `"claude-sonnet-4-5"`
1146 High-performance model for agents and coding
11471147
1148 High-performance model for agents and coding
1148 - `"claude-mythos-preview"`
11491149
1150 - `"claude-sonnet-4-5-20250929"`
1150 **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.
11511151
1152 High-performance model for agents and coding
1152 New class of intelligence, strongest in coding and cybersecurity
11531153
1154 - `"claude-mythos-preview"`
1155
1156 **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.
1157
1158 New class of intelligence, strongest in coding and cybersecurity
1159
11601154 - `string`
11611155
11621156- `cache_control: optional CacheControlEphemeral or null`
from line 3914
39203914
39213915 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
39223916
3923 - `"claude-sonnet-5-5" or "claude-fable-5-1" or "claude-opus-5-5" or 16 more`
3917 - `"claude-sonnet-5-5"`
39243918
3925 The model that will complete your prompt.
3919 Efficient model for coding and agents
39263920
3927 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
3921 - `"claude-fable-5-1"`
39283922
3929 - `"claude-sonnet-5-5"`
3923 Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows
39303924
3931 Efficient model for coding and agents
3925 - `"claude-opus-5-5"`
39323926
3933 - `"claude-fable-5-1"`
3927 Powerful intelligence for coding, knowledge work, and long-running agents
39343928
3935 Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows
3929 - `"claude-mythos-5-1"`
39363930
3937 - `"claude-opus-5-5"`
3931 Our most capable model for cybersecurity and biology research, available through trusted access programs
39383932
3939 Powerful intelligence for coding, knowledge work, and long-running agents
3933 - `"claude-sonnet-5"`
39403934
3941 - `"claude-mythos-5-1"`
3935 Efficient model for coding and agents
39423936
3943 Our most capable model for cybersecurity and biology research, available through trusted access programs
3937 - `"claude-fable-5"`
39443938
3945 - `"claude-sonnet-5"`
3939 Next generation of intelligence for the hardest knowledge work and coding problems
39463940
3947 Efficient model for coding and agents
3941 - `"claude-mythos-5"`
39483942
3949 - `"claude-fable-5"`
3943 Most capable model for cybersecurity and biology research
39503944
3951 Next generation of intelligence for the hardest knowledge work and coding problems
3945 - `"claude-opus-5"`
39523946
3953 - `"claude-mythos-5"`
3947 Powerful intelligence for long-running agents and coding
39543948
3955 Most capable model for cybersecurity and biology research
3949 - `"claude-opus-4-8"`
39563950
3957 - `"claude-opus-5"`
3951 Powerful intelligence for long-running agents and coding
39583952
3959 Powerful intelligence for long-running agents and coding
3953 - `"claude-opus-4-7"`
39603954
3961 - `"claude-opus-4-8"`
3955 Powerful intelligence for long-running agents and coding
39623956
3963 Powerful intelligence for long-running agents and coding
3957 - `"claude-opus-4-6"`
39643958
3965 - `"claude-opus-4-7"`
3959 Powerful intelligence for long-running agents and coding
39663960
3967 Powerful intelligence for long-running agents and coding
3961 - `"claude-sonnet-4-6"`
39683962
3969 - `"claude-opus-4-6"`
3963 Best combination of speed and intelligence
39703964
3971 Powerful intelligence for long-running agents and coding
3965 - `"claude-haiku-4-5"`
39723966
3973 - `"claude-sonnet-4-6"`
3967 Fastest model with near-frontier intelligence
39743968
3975 Best combination of speed and intelligence
3969 - `"claude-haiku-4-5-20251001"`
39763970
3977 - `"claude-haiku-4-5"`
3971 Fastest model with near-frontier intelligence
39783972
3979 Fastest model with near-frontier intelligence
3973 - `"claude-opus-4-5"`
39803974
3981 - `"claude-haiku-4-5-20251001"`
3975 Powerful intelligence for long-running agents and coding
39823976
3983 Fastest model with near-frontier intelligence
3977 - `"claude-opus-4-5-20251101"`
39843978
3985 - `"claude-opus-4-5"`
3979 Powerful intelligence for long-running agents and coding
39863980
3987 Powerful intelligence for long-running agents and coding
3981 - `"claude-sonnet-4-5"`
39883982
3989 - `"claude-opus-4-5-20251101"`
3983 High-performance model for agents and coding
39903984
3991 Powerful intelligence for long-running agents and coding
3985 - `"claude-sonnet-4-5-20250929"`
39923986
3993 - `"claude-sonnet-4-5"`
3987 High-performance model for agents and coding
39943988
3995 High-performance model for agents and coding
3989 - `"claude-mythos-preview"`
39963990
3997 - `"claude-sonnet-4-5-20250929"`
3991 **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.
39983992
3999 High-performance model for agents and coding
4000
4001 - `"claude-mythos-preview"`
4002
4003 **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.
4004
4005 New class of intelligence, strongest in coding and cybersecurity
3993 New class of intelligence, strongest in coding and cybersecurity
40063994
40073995 - `string`
40083996
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