What this read moved
201–209 of 209This capture is too large to show at once. Changes 201-209 of 209 are below, significant first; the rest are on the following screens.
api/messages/create Changed · +18 / -22 lines
from line 1070
10701070
10711071 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
10721072
1073 - `"claude-sonnet-5" or "claude-fable-5" or "claude-mythos-5" or 12 more`
1073 - `"claude-fable-5-1" or "claude-mythos-5-1" or "claude-sonnet-5" or 14 more`
10741074
10751075 The model that will complete your prompt.
10761076
10771077 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
10781078
1079 - `"claude-fable-5-1"`
1080
1081 Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows
1082
1083 - `"claude-mythos-5-1"`
1084
1085 Our most capable model for cybersecurity and biology research, available through trusted access programs
1086
10791087 - `"claude-sonnet-5"`
10801088
10811089 High-performance model for coding and agents
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16651673
16661674 - `type: "browser_toolset_20260801"`
16671675
1668 - `allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"`
1669
1670 - `"direct"`
1671
1672 - `"code_execution_20250825"`
1673
1674 - `"code_execution_20260120"`
1675
1676 - `"code_execution_20260521"`
1677
16781676 - `cache_control: optional CacheControlEphemeral or null`
16791677
16801678 Create a cache control breakpoint at this content block.
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21072105
21082106 - `type: "computer_toolset_20260801"`
21092107
2110 - `allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"`
2111
2112 - `"direct"`
2113
2114 - `"code_execution_20250825"`
2115
2116 - `"code_execution_20260120"`
2117
2118 - `"code_execution_20260521"`
2119
21202108 - `cache_control: optional CacheControlEphemeral or null`
21212109
21222110 Create a cache control breakpoint at this content block.
from line 3743
37553743
37563744 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
37573745
3758 - `"claude-sonnet-5" or "claude-fable-5" or "claude-mythos-5" or 12 more`
3746 - `"claude-fable-5-1" or "claude-mythos-5-1" or "claude-sonnet-5" or 14 more`
37593747
37603748 The model that will complete your prompt.
37613749
37623750 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
3751
3752 - `"claude-fable-5-1"`
3753
3754 Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows
3755
3756 - `"claude-mythos-5-1"`
3757
3758 Our most capable model for cybersecurity and biology research, available through trusted access programs
37633759
37643760 - `"claude-sonnet-5"`
37653761
api/models Changed · +14 / -2 lines
from line 34
3434
3535 - `string`
3636
37 - `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 38 more`
37 - `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 41 more`
3838
3939 - `"message-batches-2024-09-24"`
4040
from line 118
118118
119119 - `"ce-user-management-2026-07-13"`
120120
121 - `"mid-conversation-output-config-2026-07-01"`
122
123 - `"thinking-binding-controls-2026-08-01"`
124
125 - `"mid-conversation-system-clear-at-2026-08-21"`
126
121127### Returns
122128
123129- `data: array of ModelInfo`
from line 381
375381
376382 - `string`
377383
378 - `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 38 more`
384 - `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 41 more`
379385
380386 - `"message-batches-2024-09-24"`
381387
from line 464
458464 - `"thinking-display-updates-2026-08-18"`
459465
460466 - `"ce-user-management-2026-07-13"`
467
468 - `"mid-conversation-output-config-2026-07-01"`
469
470 - `"thinking-binding-controls-2026-08-01"`
471
472 - `"mid-conversation-system-clear-at-2026-08-21"`
461473
462474### Returns
463475
api/models/list Changed · +7 / -1 lines
from line 32
3232
3333 - `string`
3434
35 - `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 38 more`
35 - `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 41 more`
3636
3737 - `"message-batches-2024-09-24"`
3838
from line 115
115115 - `"thinking-display-updates-2026-08-18"`
116116
117117 - `"ce-user-management-2026-07-13"`
118
119 - `"mid-conversation-output-config-2026-07-01"`
120
121 - `"thinking-binding-controls-2026-08-01"`
122
123 - `"mid-conversation-system-clear-at-2026-08-21"`
118124
119125## Returns
120126
api/models/retrieve Changed · +7 / -1 lines
from line 20
2020
2121 - `string`
2222
23 - `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 38 more`
23 - `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 41 more`
2424
2525 - `"message-batches-2024-09-24"`
2626
from line 103
103103 - `"thinking-display-updates-2026-08-18"`
104104
105105 - `"ce-user-management-2026-07-13"`
106
107 - `"mid-conversation-output-config-2026-07-01"`
108
109 - `"thinking-binding-controls-2026-08-01"`
110
111 - `"mid-conversation-system-clear-at-2026-08-21"`
106112
107113## Returns
108114
api/beta/organization/external_keys/list Changed · +2 / -2 lines
from line 63
6363
6464 - `kms_arn: string`
6565
66 Full ARN of the AWS KMS key.
66 Full ARN of the AWS KMS key. On Claude Platform on AWS the key must be a single-Region key in your organization's own AWS account; cross-account keys, multi-Region keys, and alias ARNs are rejected.
6767
6868 maxLength: 2048
6969
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7777
7878 **Deprecated**
7979
80 IAM role ARN. Deprecated — Anthropic reaches the KMS key via a managed intermediate role; this field is ignored.
80 IAM role ARN. Deprecated — Anthropic reaches the KMS key through its own intermediate role (or, on Claude Platform on AWS, with credentials AWS issues for the Workspace); this field is ignored.
8181
8282 - `BetaGCPExternalKeyConfig object`
8383
api/beta/organization/external_keys/retrieve Changed · +2 / -2 lines
from line 62
6262
6363 - `kms_arn: string`
6464
65 Full ARN of the AWS KMS key.
65 Full ARN of the AWS KMS key. On Claude Platform on AWS the key must be a single-Region key in your organization's own AWS account; cross-account keys, multi-Region keys, and alias ARNs are rejected.
6666
6767 maxLength: 2048
6868
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7676
7777 **Deprecated**
7878
79 IAM role ARN. Deprecated — Anthropic reaches the KMS key via a managed intermediate role; this field is ignored.
79 IAM role ARN. Deprecated — Anthropic reaches the KMS key through its own intermediate role (or, on Claude Platform on AWS, with credentials AWS issues for the Workspace); this field is ignored.
8080
8181 - `BetaGCPExternalKeyConfig object`
8282
intro Changed · +1 / -1 lines
from line 7
77<Tip>
88 The latest generation of Claude models:
99
10 **Claude Fable 5.1** - For demanding reasoning and long-horizon agentic work. Read the [Claude Fable 5.1 announcement](https://www.anthropic.com/claude/fable/5-1).
10 **Claude Fable 5.1** - For demanding reasoning and long-horizon agentic work. Read the [Claude Fable 5.1 announcement](https://www.anthropic.com/claude-fable-and-mythos-5-1).
1111
1212 **Claude Mythos 5.1** - Offers Claude Fable 5.1's capabilities by invitation through [Project Glasswing](https://anthropic.com/glasswing).
1313
models/fable-5-1/overview Changed · +1 / -1 lines
from line 12
1212
1313Context window: 1M tokens · Max output: 128K tokens · Input pricing: $10 / MTok · Output pricing: $50 / MTok
1414
15[Announcement](https://www.anthropic.com/claude/fable/5-1) · [What’s new](https://platform.claude.com/docs/en/models/fable-5-1/whats-new-fable-5-1) · [Migration guide](https://platform.claude.com/docs/en/models/fable-5-1/migration-guide)
15[Announcement](https://www.anthropic.com/claude-fable-and-mythos-5-1) · [What’s new](https://platform.claude.com/docs/en/models/fable-5-1/whats-new-fable-5-1) · [Migration guide](https://platform.claude.com/docs/en/models/fable-5-1/migration-guide)
1616
1717## Overview
1818
models/mythos-5-1/overview Changed · +1 / -1 lines
from line 12
1212
1313Context window: 1M tokens · Max output: 128K tokens · Input pricing: $10 / MTok · Output pricing: $50 / MTok
1414
15[Announcement](https://www.anthropic.com/claude/fable/5-1) · [What’s new](https://platform.claude.com/docs/en/models/fable-5-1/whats-new-fable-5-1) · [Migration guide](https://platform.claude.com/docs/en/models/fable-5-1/migration-guide#migrating-from-claude-mythos-5-to-claude-mythos-5-1)
15[Announcement](https://www.anthropic.com/claude-fable-and-mythos-5-1) · [What’s new](https://platform.claude.com/docs/en/models/fable-5-1/whats-new-fable-5-1) · [Migration guide](https://platform.claude.com/docs/en/models/fable-5-1/migration-guide#migrating-from-claude-mythos-5-to-claude-mythos-5-1)
1616
1717Claude Mythos 5.1 is offered separately, by invitation only, as part of Project Glasswing. It shares Claude Fable 5.1’s specifications and pricing. For access, contact your Anthropic, AWS, or Google Cloud account team. [See Claude Fable 5.1](https://platform.claude.com/docs/en/models/fable-5-1/overview) · [Project Glasswing](https://anthropic.com/glasswing)
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