Messages changedapi/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.
Recorded here
Lines+693added
Lines−747removed
From line
1,075
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
from line 1075, old and new numbered
/
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from line 1075
10751075
10761076 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
10771077
1078 - `"claude-sonnet-5-5" or "claude-fable-5-1" or "claude-opus-5-5" or 16 more`
1078 - `"claude-sonnet-5-5"`
10791079
1080 The model that will complete your prompt.
1080 Efficient model for coding and agents
10811081
1082 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
1082 - `"claude-fable-5-1"`
10831083
1084 - `"claude-sonnet-5-5"`
1084 Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows
10851085
1086 Efficient model for coding and agents
1086 - `"claude-opus-5-5"`
10871087
1088 - `"claude-fable-5-1"`
1088 Powerful intelligence for coding, knowledge work, and long-running agents
10891089
1090 Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows
1090 - `"claude-mythos-5-1"`
10911091
1092 - `"claude-opus-5-5"`
1092 Our most capable model for cybersecurity and biology research, available through trusted access programs
10931093
1094 Powerful intelligence for coding, knowledge work, and long-running agents
1094 - `"claude-sonnet-5"`
10951095
1096 - `"claude-mythos-5-1"`
1096 Efficient model for coding and agents
10971097
1098 Our most capable model for cybersecurity and biology research, available through trusted access programs
1098 - `"claude-fable-5"`
10991099
1100 - `"claude-sonnet-5"`
1100 Next generation of intelligence for the hardest knowledge work and coding problems
11011101
1102 Efficient model for coding and agents
1102 - `"claude-mythos-5"`
11031103
1104 - `"claude-fable-5"`
1104 Most capable model for cybersecurity and biology research
11051105
1106 Next generation of intelligence for the hardest knowledge work and coding problems
1106 - `"claude-opus-5"`
11071107
1108 - `"claude-mythos-5"`
1108 Powerful intelligence for long-running agents and coding
11091109
1110 Most capable model for cybersecurity and biology research
1110 - `"claude-opus-4-8"`
11111111
1112 - `"claude-opus-5"`
1112 Powerful intelligence for long-running agents and coding
11131113
1114 Powerful intelligence for long-running agents and coding
1114 - `"claude-opus-4-7"`
11151115
1116 - `"claude-opus-4-8"`
1116 Powerful intelligence for long-running agents and coding
11171117
1118 Powerful intelligence for long-running agents and coding
1118 - `"claude-opus-4-6"`
11191119
1120 - `"claude-opus-4-7"`
1120 Powerful intelligence for long-running agents and coding
11211121
1122 Powerful intelligence for long-running agents and coding
1122 - `"claude-sonnet-4-6"`
11231123
1124 - `"claude-opus-4-6"`
1124 Best combination of speed and intelligence
11251125
1126 Powerful intelligence for long-running agents and coding
1126 - `"claude-haiku-4-5"`
11271127
1128 - `"claude-sonnet-4-6"`
1128 Fastest model with near-frontier intelligence
11291129
1130 Best combination of speed and intelligence
1130 - `"claude-haiku-4-5-20251001"`
11311131
1132 - `"claude-haiku-4-5"`
1132 Fastest model with near-frontier intelligence
11331133
1134 Fastest model with near-frontier intelligence
1134 - `"claude-opus-4-5"`
11351135
1136 - `"claude-haiku-4-5-20251001"`
1136 Powerful intelligence for long-running agents and coding
11371137
1138 Fastest model with near-frontier intelligence
1138 - `"claude-opus-4-5-20251101"`
11391139
1140 - `"claude-opus-4-5"`
1140 Powerful intelligence for long-running agents and coding
11411141
1142 Powerful intelligence for long-running agents and coding
1142 - `"claude-sonnet-4-5"`
11431143
1144 - `"claude-opus-4-5-20251101"`
1144 High-performance model for agents and coding
11451145
1146 Powerful intelligence for long-running agents and coding
1146 - `"claude-sonnet-4-5-20250929"`
11471147
1148 - `"claude-sonnet-4-5"`
1148 High-performance model for agents and coding
11491149
1150 High-performance model for agents and coding
1150 - `"claude-mythos-preview"`
11511151
1152 - `"claude-sonnet-4-5-20250929"`
1152 **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.
11531153
1154 High-performance model for agents and coding
1154 New class of intelligence, strongest in coding and cybersecurity
11551155
1156 - `"claude-mythos-preview"`
1157
1158 **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.
1159
1160 New class of intelligence, strongest in coding and cybersecurity
1161
11621156 - `string`
11631157
11641158- `cache_control: optional CacheControlEphemeral or null`
from line 3916
39223916
39233917 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
39243918
3925 - `"claude-sonnet-5-5" or "claude-fable-5-1" or "claude-opus-5-5" or 16 more`
3919 - `"claude-sonnet-5-5"`
39263920
3927 The model that will complete your prompt.
3921 Efficient model for coding and agents
39283922
3929 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
3923 - `"claude-fable-5-1"`
39303924
3931 - `"claude-sonnet-5-5"`
3925 Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows
39323926
3933 Efficient model for coding and agents
3927 - `"claude-opus-5-5"`
39343928
3935 - `"claude-fable-5-1"`
3929 Powerful intelligence for coding, knowledge work, and long-running agents
39363930
3937 Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows
3931 - `"claude-mythos-5-1"`
39383932
3939 - `"claude-opus-5-5"`
3933 Our most capable model for cybersecurity and biology research, available through trusted access programs
39403934
3941 Powerful intelligence for coding, knowledge work, and long-running agents
3935 - `"claude-sonnet-5"`
39423936
3943 - `"claude-mythos-5-1"`
3937 Efficient model for coding and agents
39443938
3945 Our most capable model for cybersecurity and biology research, available through trusted access programs
3939 - `"claude-fable-5"`
39463940
3947 - `"claude-sonnet-5"`
3941 Next generation of intelligence for the hardest knowledge work and coding problems
39483942
3949 Efficient model for coding and agents
3943 - `"claude-mythos-5"`
39503944
3951 - `"claude-fable-5"`
3945 Most capable model for cybersecurity and biology research
39523946
3953 Next generation of intelligence for the hardest knowledge work and coding problems
3947 - `"claude-opus-5"`
39543948
3955 - `"claude-mythos-5"`
3949 Powerful intelligence for long-running agents and coding
39563950
3957 Most capable model for cybersecurity and biology research
3951 - `"claude-opus-4-8"`
39583952
3959 - `"claude-opus-5"`
3953 Powerful intelligence for long-running agents and coding
39603954
3961 Powerful intelligence for long-running agents and coding
3955 - `"claude-opus-4-7"`
39623956
3963 - `"claude-opus-4-8"`
3957 Powerful intelligence for long-running agents and coding
39643958
3965 Powerful intelligence for long-running agents and coding
3959 - `"claude-opus-4-6"`
39663960
3967 - `"claude-opus-4-7"`
3961 Powerful intelligence for long-running agents and coding
39683962
3969 Powerful intelligence for long-running agents and coding
3963 - `"claude-sonnet-4-6"`
39703964
3971 - `"claude-opus-4-6"`
3965 Best combination of speed and intelligence
39723966
3973 Powerful intelligence for long-running agents and coding
3967 - `"claude-haiku-4-5"`
39743968
3975 - `"claude-sonnet-4-6"`
3969 Fastest model with near-frontier intelligence
39763970
3977 Best combination of speed and intelligence
3971 - `"claude-haiku-4-5-20251001"`
39783972
3979 - `"claude-haiku-4-5"`
3973 Fastest model with near-frontier intelligence
39803974
3981 Fastest model with near-frontier intelligence
3975 - `"claude-opus-4-5"`
39823976
3983 - `"claude-haiku-4-5-20251001"`
3977 Powerful intelligence for long-running agents and coding
39843978
3985 Fastest model with near-frontier intelligence
3979 - `"claude-opus-4-5-20251101"`
39863980
3987 - `"claude-opus-4-5"`
3981 Powerful intelligence for long-running agents and coding
39883982
3989 Powerful intelligence for long-running agents and coding
3983 - `"claude-sonnet-4-5"`
39903984
3991 - `"claude-opus-4-5-20251101"`
3985 High-performance model for agents and coding
39923986
3993 Powerful intelligence for long-running agents and coding
3987 - `"claude-sonnet-4-5-20250929"`
39943988
3995 - `"claude-sonnet-4-5"`
3989 High-performance model for agents and coding
39963990
3997 High-performance model for agents and coding
3991 - `"claude-mythos-preview"`
39983992
3999 - `"claude-sonnet-4-5-20250929"`
3993 **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.
40003994
4001 High-performance model for agents and coding
3995 New class of intelligence, strongest in coding and cybersecurity
40023996
4003 - `"claude-mythos-preview"`
4004
4005 **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.
4006
4007 New class of intelligence, strongest in coding and cybersecurity
4008
40093997 - `string`
40103998
40113999 - `role: "assistant"`
from line 5558
55705558
55715559 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
55725560
5573 - `"claude-sonnet-5-5" or "claude-fable-5-1" or "claude-opus-5-5" or 16 more`
5561 - `"claude-sonnet-5-5"`
55745562
5575 The model that will complete your prompt.
5563 Efficient model for coding and agents
55765564
5577 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
5565 - `"claude-fable-5-1"`
55785566
5579 - `"claude-sonnet-5-5"`
5567 Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows
55805568
5581 Efficient model for coding and agents
5569 - `"claude-opus-5-5"`
55825570
5583 - `"claude-fable-5-1"`
5571 Powerful intelligence for coding, knowledge work, and long-running agents
55845572
5585 Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows
5573 - `"claude-mythos-5-1"`
55865574
5587 - `"claude-opus-5-5"`
5575 Our most capable model for cybersecurity and biology research, available through trusted access programs
55885576
5589 Powerful intelligence for coding, knowledge work, and long-running agents
5577 - `"claude-sonnet-5"`
55905578
5591 - `"claude-mythos-5-1"`
5579 Efficient model for coding and agents
55925580
5593 Our most capable model for cybersecurity and biology research, available through trusted access programs
5581 - `"claude-fable-5"`
55945582
5595 - `"claude-sonnet-5"`
5583 Next generation of intelligence for the hardest knowledge work and coding problems
55965584
5597 Efficient model for coding and agents
5585 - `"claude-mythos-5"`
55985586
5599 - `"claude-fable-5"`
5587 Most capable model for cybersecurity and biology research
56005588
5601 Next generation of intelligence for the hardest knowledge work and coding problems
5589 - `"claude-opus-5"`
56025590
5603 - `"claude-mythos-5"`
5591 Powerful intelligence for long-running agents and coding
56045592
5605 Most capable model for cybersecurity and biology research
5593 - `"claude-opus-4-8"`
56065594
5607 - `"claude-opus-5"`
5595 Powerful intelligence for long-running agents and coding
56085596
5609 Powerful intelligence for long-running agents and coding
5597 - `"claude-opus-4-7"`
56105598
5611 - `"claude-opus-4-8"`
5599 Powerful intelligence for long-running agents and coding
56125600
5613 Powerful intelligence for long-running agents and coding
5601 - `"claude-opus-4-6"`
56145602
5615 - `"claude-opus-4-7"`
5603 Powerful intelligence for long-running agents and coding
56165604
5617 Powerful intelligence for long-running agents and coding
5605 - `"claude-sonnet-4-6"`
56185606
5619 - `"claude-opus-4-6"`
5607 Best combination of speed and intelligence
56205608
5621 Powerful intelligence for long-running agents and coding
5609 - `"claude-haiku-4-5"`
56225610
5623 - `"claude-sonnet-4-6"`
5611 Fastest model with near-frontier intelligence
56245612
5625 Best combination of speed and intelligence
5613 - `"claude-haiku-4-5-20251001"`
56265614
5627 - `"claude-haiku-4-5"`
5615 Fastest model with near-frontier intelligence
56285616
5629 Fastest model with near-frontier intelligence
5617 - `"claude-opus-4-5"`
56305618
5631 - `"claude-haiku-4-5-20251001"`
5619 Powerful intelligence for long-running agents and coding
56325620
5633 Fastest model with near-frontier intelligence
5621 - `"claude-opus-4-5-20251101"`
56345622
5635 - `"claude-opus-4-5"`
5623 Powerful intelligence for long-running agents and coding
56365624
5637 Powerful intelligence for long-running agents and coding
5625 - `"claude-sonnet-4-5"`
56385626
5639 - `"claude-opus-4-5-20251101"`
5627 High-performance model for agents and coding
56405628
5641 Powerful intelligence for long-running agents and coding
5629 - `"claude-sonnet-4-5-20250929"`
56425630
5643 - `"claude-sonnet-4-5"`
5631 High-performance model for agents and coding
56445632
5645 High-performance model for agents and coding
5633 - `"claude-mythos-preview"`
56465634
5647 - `"claude-sonnet-4-5-20250929"`
5635 **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.
56485636
5649 High-performance model for agents and coding
5637 New class of intelligence, strongest in coding and cybersecurity
56505638
5651 - `"claude-mythos-preview"`
5652
5653 **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.
5654
5655 New class of intelligence, strongest in coding and cybersecurity
5656
56575639 - `string`
56585640
56595641- `cache_control: optional CacheControlEphemeral or null`
from line 8401
84198401
84208402 - `path: optional string or null`
84218403
8422 Where the executor saved the file, on the executor's filesystem. Only included when a
8404 Where the executor saved the file, on the executor's filesystem. Only included when another tool in the same environment can read the file at that path.
8405
8406 maxLength: 4096, pattern: ^[^\x00-\x1f\x7f-\x9f\u2028\u2029]*$
8407
8408 - `size_bytes: optional number or null`
8409
8410 The completed download's size.
8411
8412 minimum: 0
8413
8414### Browser State Change Download Failed
8415
8416- `BrowserStateChangeDownloadFailed object`
8417
8418 A file download that failed — or was cancelled — during this call.
8419
8420 - `type: "download_failed"`
8421
8422 - `download_id: string`
8423
8424 The caller-assigned identifier for this download, stable across the state changes reporting it.
8425
8426 minLength: 1, maxLength: 4096, pattern: ^[^\x00-\x1f\x7f-\x9f\u2028\u2029]*$
8427
8428 - `url: string`
8429
8430 The final post-redirect URL the download was served from.
8431
8432 maxLength: 4096, pattern: ^[^\x00-\x1f\x7f-\x9f\u2028\u2029]*$
8433
8434 - `error: optional string or null`
8435
8436 The failure or cancellation detail, when known.
8437
8438 maxLength: 4096, pattern: ^[^\x00-\x1f\x7f-\x9f\u2028\u2029]*$
8439
No line in this hunk matches that.