api-20260930T193725Z / documentation capture

about-claude/model-deprecations Changed · +32 / -24 lines

### 2026-09-30: Claude Sonnet 4.5 model

from line 66

6666

6767Current and recently retired models are listed in the following table with their status:

6868

70| :------------------------- | :------------ | :---------------- | :--------------------------------- |

70| -------------------------- | ------------- | ------------------ | ---------------------------------- |

9393

9494## Deprecation history

9595

9696All deprecations are listed in the following sections, with the most recent announcements first.

97

98### 2026-09-30: Claude Sonnet 4.5 model

99

100On September 30, 2026, Anthropic notified developers using Claude Sonnet 4.5 of its upcoming retirement on the Claude API.

101

102| Retirement date | Deprecated model | Recommended replacement |

103| ----------------- | ---------------------------- | ----------------------- |

104| November 30, 2026 | `claude-sonnet-4-5-20250929` | `claude-sonnet-5-5` |

97105

98106### 2026-06-05: Claude Opus 4.1 model

99107

cli-sdks-libraries/cli/apply Changed · +3 / -2 lines

from line 157

157157 ```yaml

158158 # yaml-language-server: $schema=https://platform.claude.com/schemas/ant/beta/environment.json

159159 name: review-env

160 description: Cloud container with unrestricted networking for review sessions.

160 description: Cloud container with limited networking for review sessions.

161161 config:

162162 type: cloud

163163 networking:

164 type: unrestricted

164 type: limited

165 allow_package_managers: true

165166 ```

166167 </File>

167168

manage-claude/cmek Changed · +7 / -22 lines

### Feature support

from line 58

5858**Claude Platform**

5959

6060* Message content, files and attachments (both inline attachments sent with a request and Files API uploads), and MCP and tool configuration.

61* [Claude Managed Agents](https://platform.claude.com/docs/en/managed-agents/overview) data, including agent configurations, environments, webhooks, sessions and their events, [memory stores](https://platform.claude.com/docs/en/managed-agents/memory) and their memories and memory versions, and [dreams](https://platform.claude.com/docs/en/managed-agents/dreams).

61* [Claude Managed Agents](https://platform.claude.com/docs/en/managed-agents/overview) (beta) data, including agent configurations, environments, webhooks, sessions and their events, [memory stores](https://platform.claude.com/docs/en/managed-agents/memory) (beta) and their memories and memory versions, and [dreams](https://platform.claude.com/docs/en/managed-agents/dreams) (research preview).

62* Data stored at rest by the Batch and Skills APIs, and by these tools: web search, web fetch, code execution, bash, text editor, MCP connector (beta), structured outputs, advisor tool (beta), computer use, browser use, and context management.

6263

6364**Claude Enterprise**

6465

from line 70

6970* Compliance API [local session transcripts](https://platform.claude.com/docs/en/manage-claude/compliance-sessions#retrieve-local-sessions) captured from sessions on users' machines. If your key cannot be used, the messages endpoint returns [503 Service Unavailable](https://platform.claude.com/docs/en/manage-claude/compliance-errors#local-sessions-temporarily-unavailable) instead of transcript content. Session metadata is still listed.

7071* Office agents.

7172* Claude in Chrome.

72* Claude Science. Data that users send from the app to their own compute, such as SSH hosts or cloud compute accounts, is held on those systems, not by Anthropic, and is not covered.

73* Claude Science, which is in beta.

7374

7475On both products, backups and snapshots inherit the key.

7576

from line 82

8182

8283* Playground in the Claude Console is disabled.

8384* Portions of the Compliance API that return raw content, such as prompts, responses, and files, are disabled.

85* Structured outputs are not available for Claude Fable or Claude Mythos models in CMEK organizations.

8486* Other beta and research preview features might not be covered by CMEK.

8587

8688**Claude Enterprise**

from line 89

8789

8890* Chat search is disabled because chat titles and content are encrypted under your key. Members cannot search past chats, and the **Search and reference chats** toggle stays off, so Claude cannot search them either.

8991* [Project knowledge search](https://support.claude.com/en/articles/11473015-retrieval-augmented-generation-rag-for-projects) (retrieval-augmented generation, or RAG) is disabled. Project knowledge loads directly into each conversation's context instead of being indexed and searched. As a result, a project can use substantially less knowledge than it could without CMEK. Knowledge beyond what can be loaded is left out of the conversation.

90* Claude Code on the web (including routines) and Claude in Slack are unavailable: new sessions cannot be started and Claude in Slack declines requests, even if an admin turns these products on. Claude Code Desktop remains available for local sessions but is off unless an admin turns it on under [claude.ai > Organization settings > Claude Code](https://claude.ai/admin-settings/claude-code).

91* In conversations and the **Artifacts** tab, Claude Design, Claude Slides, and Claude Docs are unavailable, and admins cannot turn them on. Claude Code cannot [publish artifacts](https://code.claude.com/docs/en/artifacts#availability).

92* Claude Code on the web and Claude in Slack are unavailable: new sessions cannot be started and Claude in Slack declines requests, even if an admin turns these products on. Claude Code Desktop remains available for local sessions but is off unless an admin turns it on under [claude.ai > Organization settings > Claude Code](https://claude.ai/admin-settings/claude-code).

93* Artifacts cannot be shared publicly, only within your organization.

9294* Certain analytics are degraded: admin analytics for claude.ai skills and connectors (under claude.ai/analytics/usage and through the [Claude Enterprise Analytics API](https://platform.claude.com/docs/en/manage-claude/analytics-api)), Claude smart reports (under claude.ai/analytics/insights), and Claude Code contribution metrics (under claude.ai/analytics/claude-code).

9395* Organization data exports and audit log exports, both under [claude.ai > Organization settings > Data and privacy](https://claude.ai/admin-settings/data-privacy-controls), are disabled.

9496* Response ratings (thumbs up and thumbs down on Claude's responses) are disabled.

97* The following beta and research preview features are unavailable in CMEK organizations, regardless of admin settings: Claude Design, Claude Slides, and Claude Docs in conversations and the **Artifacts** tab, and routines.

9598

9699### Encrypted with Anthropic key

97100

from line 113

110113* [Personal preferences - Instructions for Claude section](https://claude.ai/new#settings/account) and Cowork Global instructions. These are set at the account level and shared across all of a user's organizations.

111114

112115On both products, account data for users in your organization (such as names, email addresses, and profile pictures) is not encrypted under your key.

113

114### Feature support

115

116The following Claude Platform APIs and tools store data at rest under your key when CMEK is enabled:

117

118| APIs | Tools and features |

119| --------------------- | ------------------------------------------------------------------------------------------------- |

120| Messages | Web search |

121| Models | Web fetch |

122| Files | Code execution |

123| Batch | Bash tool |

124| Skills | Text editor tool |

125| Claude Managed Agents | MCP connector |

126| Memory stores | Structured outputs (not available for Claude Fable or Claude Mythos models in CMEK organizations) |

127| Dreams | Advisor tool |

128| | Computer use |

129| | Browser use |

130| | Context management |

131116

132117## Limited preservation outside your key

133118

managed-agents/migration Changed · +21 / -8 lines

from line 717

717717 )

718718 environment = client.beta.environments.create(

719719 name="weather-env",

720 config={"type": "cloud", "networking": {"type": "unrestricted"}},

720 config={

721 "type": "cloud",

722 "networking": {"type": "limited", "allow_package_managers": True},

723 },

721724 )

722725

723726 session = client.beta.sessions.create(

from line 792

789792 });

790793 const environment = await client.beta.environments.create({

791794 name: "weather-env",

792 config: { type: "cloud", networking: { type: "unrestricted" } }

795 config: {

796 type: "cloud",

797 networking: { type: "limited", allow_package_managers: true }

798 }

793799 });

794800

795801 const session = await client.beta.sessions.create({

from line 887

881887 Name = "weather-env",

882888 Config = new BetaCloudConfigParams

883889 {

884 Networking = new BetaUnrestrictedNetwork(),

890 Networking = new BetaLimitedNetworkParams { AllowPackageManagers = true },

885891 },

886892 });

887893

from line 989

983989 Config: anthropic.BetaEnvironmentNewParamsConfigUnion{

984990 OfCloud: &anthropic.BetaCloudConfigParams{

985991 Networking: anthropic.BetaCloudConfigParamsNetworkingUnion{

986 OfUnrestricted: &anthropic.BetaUnrestrictedNetworkParam{},

992 OfLimited: &anthropic.BetaLimitedNetworkParams{

993 AllowPackageManagers: anthropic.Bool(true),

994 },

987995 },

988996 },

989997 },

from line 1088

10801088 import com.anthropic.models.beta.agents.BetaManagedAgentsCustomToolParams;

10811089 import com.anthropic.models.beta.agents.BetaManagedAgentsModel;

10821090 import com.anthropic.models.beta.environments.BetaCloudConfigParams;

1083 import com.anthropic.models.beta.environments.BetaUnrestrictedNetwork;

1091 import com.anthropic.models.beta.environments.BetaLimitedNetworkParams;

10841092 import com.anthropic.models.beta.environments.EnvironmentCreateParams;

10851093 import com.anthropic.models.beta.sessions.BetaManagedAgentsAgentParams;

10861094 import com.anthropic.models.beta.sessions.SessionCreateParams;

from line 1118

11101118 var environment = client.beta().environments().create(EnvironmentCreateParams.builder()

11111119 .name("weather-env")

11121120 .config(BetaCloudConfigParams.builder()

1113 .networking(BetaUnrestrictedNetwork.builder().build())

1121 .networking(BetaLimitedNetworkParams.builder()

1122 .allowPackageManagers(true)

1123 .build())

11141124 .build())

11151125 .build());

11161126

from line 1208

11981208 );

11991209 $environment = $client->beta->environments->create(

12001210 name: 'weather-env',

1201 config: ['type' => 'cloud', 'networking' => ['type' => 'unrestricted']],

1211 config: [

1212 'type' => 'cloud',

1213 'networking' => ['type' => 'limited', 'allow_package_managers' => true],

1214 ],

12021215 );

12031216

12041217 $session = $client->beta->sessions->create(

from line 1296

12831296 )

12841297 environment = client.beta.environments.create(

12851298 name: "weather-env",

1286 config: {type: "cloud", networking: {type: "unrestricted"}}

1299 config: {type: "cloud", networking: {type: "limited", allow_package_managers: true}}

12871300 )

12881301

12891302 session = client.beta.sessions.create(

managed-agents/quickstart Changed · +22 / -11 lines

from line 304

304304 import com.anthropic.models.beta.agents.BetaManagedAgentsAgentToolset20260401Params;

305305 import com.anthropic.models.beta.agents.BetaManagedAgentsModel;

306306 import com.anthropic.models.beta.environments.BetaCloudConfigParams;

307 import com.anthropic.models.beta.environments.BetaUnrestrictedNetwork;

307 import com.anthropic.models.beta.environments.BetaLimitedNetworkParams;

308308 import com.anthropic.models.beta.environments.EnvironmentCreateParams;

309309 import com.anthropic.models.beta.sessions.SessionCreateParams;

310310 import com.anthropic.models.beta.sessions.events.BetaManagedAgentsStreamSessionEvents;

from line 374

374374 </Step>

375375

376376 <Step title="Create an environment">

377 An environment defines the sandbox where your agent runs.

377 An environment defines the sandbox where your agent runs. This one uses `limited` [networking](https://platform.claude.com/docs/en/managed-agents/environments#networking) with package managers allowed, so code running in the sandbox can reach public [package registries and code hosts](https://platform.claude.com/docs/en/managed-agents/environments#package-manager-hosts) and no other sites. Web search and web fetch run outside the sandbox and are not affected.

378378

379379 <CodeGroup defaultLanguage="CLI">

380380 <CodeGroupItem>

from line 390

390390 "name": "quickstart-env",

391391 "config": {

392392 "type": "cloud",

393 "networking": {"type": "unrestricted"}

393 "networking": {"type": "limited", "allow_package_managers": true}

394394 }

395395 }

396396 EOF

from line 416

416416 config:

417417 type: cloud

418418 networking:

419 type: unrestricted

419 type: limited

420 allow_package_managers: true

420421 ```

421422 </File>

422423

from line 430

429430 name="quickstart-env",

430431 config={

431432 "type": "cloud",

432 "networking": {"type": "unrestricted"},

433 "networking": {"type": "limited", "allow_package_managers": True},

433434 },

434435 )

435436

from line 446

445446 name: "quickstart-env",

446447 config: {

447448 type: "cloud",

448 networking: { type: "unrestricted" },

449 networking: { type: "limited", allow_package_managers: true },

449450 },

450451 });

451452

from line 461

460461 var environment = await client.Beta.Environments.Create(new()

461462 {

462463 Name = "quickstart-env",

463 Config = new BetaCloudConfigParams { Networking = new BetaUnrestrictedNetwork() },

464 Config = new BetaCloudConfigParams

465 {

466 Networking = new BetaLimitedNetworkParams { AllowPackageManagers = true },

467 },

464468 });

465469

466470 Console.WriteLine($"Environment ID: {environment.ID}");

from line 480

476480 Config: anthropic.BetaEnvironmentNewParamsConfigUnion{

477481 OfCloud: &anthropic.BetaCloudConfigParams{

478482 Networking: anthropic.BetaCloudConfigParamsNetworkingUnion{

479 OfUnrestricted: &anthropic.BetaUnrestrictedNetworkParam{},

483 OfLimited: &anthropic.BetaLimitedNetworkParams{

484 AllowPackageManagers: anthropic.Bool(true),

485 },

480486 },

481487 },

482488 },

from line 502

496502 var environment = client.beta().environments().create(EnvironmentCreateParams.builder()

497503 .name("quickstart-env")

498504 .config(BetaCloudConfigParams.builder()

499 .networking(BetaUnrestrictedNetwork.builder().build())

505 .networking(BetaLimitedNetworkParams.builder()

506 .allowPackageManagers(true)

507 .build())

500508 .build())

501509 .build());

502510

from line 518

510518 ```php PHP

511519 $environment = $client->beta->environments->create(

512520 name: 'quickstart-env',

513 config: ['type' => 'cloud', 'networking' => ['type' => 'unrestricted']],

521 config: [

522 'type' => 'cloud',

523 'networking' => ['type' => 'limited', 'allow_package_managers' => true],

524 ],

514525 );

515526

516527 echo "Environment ID: {$environment->id}\n";

from line 534

523534 ```ruby Ruby

524535 environment = client.beta.environments.create(

525536 name: "quickstart-env",

526 config: {type: "cloud", networking: {type: "unrestricted"}}

537 config: {type: "cloud", networking: {type: "limited", allow_package_managers: true}}

527538 )

528539

529540 puts "Environment ID: #{environment.id}"

release-notes/overview Changed · +4 / -0 lines

### September 30, 2026

from line 12

1212 For updates to Claude Code, see the [complete CHANGELOG.md](https://github.com/anthropics/claude-code/blob/main/CHANGELOG.md) in the `claude-code` repository.

1313</Tip>

1414

15### September 30, 2026

16

17* We announced the deprecation of the Claude Sonnet 4.5 model (`claude-sonnet-4-5-20250929`), with retirement on the Claude API scheduled for November 30, 2026. We recommend migrating to [Claude Sonnet 5.5](https://platform.claude.com/docs/en/models/sonnet-5-5/migration-guide#migrating-from-sonnet-45). Read more in [Model deprecations](https://platform.claude.com/docs/en/about-claude/model-deprecations).

18

1519### September 28, 2026

1620

1721* We've launched **Claude Sonnet 5.5** (`claude-sonnet-5-5`). It's available on the Claude API, [Claude in Amazon Bedrock](https://platform.claude.com/docs/en/build-with-claude/claude-in-amazon-bedrock), [Claude Platform on AWS](https://platform.claude.com/docs/en/build-with-claude/claude-platform-on-aws), [Claude on Google Cloud](https://platform.claude.com/docs/en/build-with-claude/claude-on-vertex-ai), and [Claude in Microsoft Foundry](https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry). For its context window, output limits, and prices, see the [Claude Sonnet 5.5 model page](https://platform.claude.com/docs/en/models/sonnet-5-5/overview).

managed-agents/github Changed · +1 / -1 lines

from line 241

241241 ```

242242</CodeGroup>

243243

244Then create a session that mounts the GitHub repository:

244Then create a session that mounts the GitHub repository. A `limited` [environment](https://platform.claude.com/docs/en/managed-agents/environments#networking) blocks an agent's MCP servers unless its networking sets `allow_mcp_servers: true` or lists each server's host in `allowed_hosts`. With neither set, session creation fails with a 400 error.

245245

246246<CodeGroup>

247247 ```bash cURL

managed-agents/mcp-connector Changed · +2 / -0 lines

from line 291

291291

292292When starting a session, pass `vault_ids` to provide credentials for your MCP servers. Vaults are collections of credentials that you register once and reference by ID. See [Authenticate with vaults](https://platform.claude.com/docs/en/managed-agents/vaults) for how to create vaults and manage credentials.

293293

294A `limited` [environment](https://platform.claude.com/docs/en/managed-agents/environments#networking) blocks an agent's MCP servers unless its networking sets `allow_mcp_servers: true` or lists each server's host in `allowed_hosts`. With neither set, session creation fails with a 400 error.

295

294296<CodeGroup>

295297 ```bash cURL

296298 session_response=$(curl -sS --fail-with-body https://api.anthropic.com/v1/sessions \

managed-agents/multiagent-orchestration Changed · +2 / -0 lines

from line 417

417417

418418[Agent configuration overrides](https://platform.claude.com/docs/en/managed-agents/sessions#override-agent-configuration-for-a-session) at session creation can replace the coordinator's MCP servers and those of its `self` copies.

419419

420A `limited` [environment](https://platform.claude.com/docs/en/managed-agents/environments#networking) blocks an agent's MCP servers unless its networking sets `allow_mcp_servers: true` or lists each server's host in `allowed_hosts`. With neither set, session creation fails with a 400 error. The check covers every agent the coordinator can delegate to.

421

420422Create the researcher, which declares the GitHub MCP server, and the coordinator that delegates to the researcher:

421423

422424<CodeGroup defaultLanguage="CLI">

One read of Claude Developer Platformapi-20260930T193725Z

What this read moved