Anthropic Messages?beta=true API
The Messages?beta=true API from Anthropic — 1 operation(s) for messages?beta=true.
Anthropic Messages?beta=true API is one of 43 APIs that Anthropic publishes on the APIs.io network, described by a machine-readable OpenAPI specification.
Tagged areas include Messages?beta=true. The published artifact set on APIs.io includes an OpenAPI specification and API documentation.
This API exposes 1 operation across 1 path, and defines 288 schemas. It is described by OpenAPI 3.2.0.
Requests are made against a single base URL, https://api.anthropic.com.
1 operations
1 paths
288 schemas
1 POST
Metadata
The identity and technical contract details declared by the specification.
Paths & Operations 1
Across 1 path, the API surfaces 1 operation — 1 POST. Each is listed below with its method, path, parameters, and response codes.
Messages?beta=true 1
POST
/v1/messages?beta=true
Create a Message
Schemas 288
The contract defines 288 schemas that model the data the API accepts and returns. The most detailed are BetaBrowserToolsetConfigs (31 properties), BetaCreateMessageParams (25 properties), BetaComputerToolsetConfigs (17 properties), BetaWebFetchTool_20260318 (13 properties). Each schema is shown below with its type and property counts.
BetaBrowserGetPageTextConfig
object
getpagetext's config overrides.
2 properties
BetaIterationsUsage
Per-iteration token usage breakdown. Each entry represents one sampling iteration, with its own input/output token counts and cache statistics, discriminated b…
BetaResponseCitationsConfig
object
1 property
1 required
BetaComputerCursorPositionConfig
object
cursorposition's config overrides.
2 properties
BetaTokenTaskBudget
object
User-configurable total token budget across contexts.
3 properties
2 required
BetaRequestTextEditorCodeExecutionViewResultBlock
object
6 properties
3 required
BetaResponseCodeExecutionToolResultBlock
object
3 properties
3 required
BetaResponseCodeExecutionToolResultError
object
2 properties
2 required
BetaCodeExecutionTool_20250825
object
6 properties
2 required
BetaRequestToolUseBlock
object
7 properties
4 required
BetaInputSchema
object
3 properties
1 required
BetaSkillParams
object
Specification for a skill to be loaded in a container (request model).
3 properties
2 required
BetaResponseBashCodeExecutionToolResultBlock
object
3 properties
3 required
BetaComputerWaitConfig
object
wait's config overrides.
2 properties
BetaTextEditorCodeExecutionToolResultErrorCode
string
BetaWebFetchToolResultErrorCode
string
BetaBashTool_20241022
object
7 properties
2 required
BetaCodeExecutionTool_20260521
object
Code execution tool with REPL state persistence.
6 properties
2 required
BetaRequestDocumentBlock
object
6 properties
2 required
BetaRefusalCategory
string
The policy category that triggered a refusal.
BetaUserLocation
object
5 properties
1 required
BetaTextEditor_20250429
object
7 properties
2 required
BetaResponseFallbackHopInfo
object
Identifies one hop of a fallback transition.
1 property
1 required
BetaCacheMissSystemChanged
object
2 properties
2 required
BetaDirectCaller
object
Tool invocation directly from the model.
1 property
1 required
BetaComputerUseTool_20251124
object
11 properties
4 required
BetaBrowserReadConsoleConfig
object
readconsole's config overrides.
2 properties
BetaRequestCitationsConfig
object
1 property
BetaBrowserWaitConfig
object
wait's config overrides.
2 properties
BetaOutputTokensDetails
object
1 property
1 required
BetaComputerToolsetConfigs
object
Per-member configuration for computertoolset20260801: one optional field per member tool, keyed by the member name — the same name the member's tooluse blocks…
17 properties
BetaResponseWebFetchToolResultError
object
2 properties
2 required
BetaResponseToolSearchToolResultError
object
3 properties
3 required
BetaComputerLeftMouseUpConfig
object
leftmouseup's config overrides.
2 properties
BetaRequestMCPToolUseBlock
object
6 properties
5 required
BetaRequestToolSearchToolSearchResultBlock
object
2 properties
2 required
BetaResponseAdvisorRedactedResultBlock
object
3 properties
3 required
BetaRefusalStopDetails
object
Structured information about a refusal.
6 properties
6 required
BetaBrowserJavascriptExecConfig
object
javascriptexec's config overrides.
2 properties
BetaInputMessage
object
2 properties
2 required
BetaAllThinkingTurns
object
1 property
1 required
BetaWebFetchTool_20260309
object
Web fetch tool with usecache parameter for bypassing cached content.
12 properties
2 required
BetaToolChoiceAny
object
The model will use any available tools.
2 properties
1 required
BetaComputerLeftClickConfig
object
leftclick's config overrides.
2 properties
BetaFileDocumentSource
object
2 properties
2 required
BetaResponseToolSearchToolResultBlock
object
3 properties
3 required
BetaResponseSearchResultLocationCitation
object
7 properties
7 required
BetaStopReason
string
BetaMessageIterationUsage
object
Token usage for a sampling iteration.
7 properties
7 required
BetaWebSearchTool_20260318
object
11 properties
2 required
BetaResponseContentBlockLocationCitation
object
7 properties
7 required
BetaResponsePageLocationCitation
object
7 properties
7 required
BetaBrowserReadNetworkConfig
object
readnetwork's config overrides.
2 properties
BetaComputerLeftMouseDownConfig
object
leftmousedown's config overrides.
2 properties
BetaComputerScreenshotConfig
object
screenshot's config overrides.
2 properties
BetaRequestToolAdditionBlock
object
Mid-conversation directive to surface a declared tool. tool references a tool (or MCP toolset) by name from the request's tools; it is offered to the model fro…
3 properties
2 required
BetaCacheCreation
object
2 properties
2 required
BetaRequestToolRemovalBlock
object
Mid-conversation directive to withdraw a tool. tool references a tool (or MCP toolset) by name from the request's tools; it is no longer offered to the model f…
3 properties
2 required
BetaFallbackRefusalTrigger
object
The from model declined for policy reasons.
2 properties
2 required
BetaResponseWebSearchToolResultBlock
object
4 properties
3 required
BetaComputerUseTool_20241022
object
10 properties
4 required
BetaThinkingConfigAdaptive
object
2 properties
1 required
BetaCacheMissMessagesChanged
object
2 properties
2 required
BetaFallbackMessageIterationUsage
object
Token usage for the fallback-model attempt of a server-side fallback request. Produced in place of a message entry for whichever hop served the response. A dec…
7 properties
7 required
BetaBrowserRightClickConfig
object
rightclick's config overrides.
2 properties
BetaCacheControlEphemeral
object
2 properties
1 required
BetaCreateMessageParams
object
25 properties
3 required
BetaBrowserTypeConfig
object
type's config overrides.
2 properties
BetaContentBlockSource
object
2 properties
2 required
BetaMemoryTool_20250818
object
7 properties
2 required
BetaRequestToolResultBlock
object
6 properties
2 required
BetaGatewayTimeoutError
object
2 properties
2 required
BetaComputerTypeConfig
object
type's config overrides.
2 properties
BetaResponseWebFetchResultBlock
object
4 properties
4 required
BetaDiagnostics
object
Response envelope for request-level diagnostics. Present (possibly null) whenever the caller supplied diagnostics on the request.
1 property
1 required
BetaResponseWebSearchToolResultError
object
2 properties
2 required
BetaRequestImageBlock
object
4 properties
2 required
BetaJsonOutputFormat
object
2 properties
2 required
BetaRequestTextEditorCodeExecutionCreateResultBlock
object
2 properties
2 required
BetaBashTool_20250124
object
7 properties
2 required
BetaResponseWebSearchResultLocationCitation
object
5 properties
5 required
BetaInputTokensTrigger
object
2 properties
2 required
BetaComputerScrollConfig
object
scroll's config overrides.
2 properties
BetaWebFetchTool_20260318
object
13 properties
2 required
BetaBase64PDFSource
object
3 properties
3 required
BetaInputTokensClearAtLeast
object
2 properties
2 required
BetaRequestTextEditorCodeExecutionToolResultBlock
object
4 properties
3 required
BetaBrowserStateChangeDownloadFailed
object
A file download that failed — or was cancelled — during this call.
4 properties
3 required
BetaResponseTextEditorCodeExecutionToolResultBlock
object
3 properties
3 required
BetaBrowserLeftMouseUpConfig
object
leftmouseup's config overrides.
2 properties
BetaRequestEncryptedCodeExecutionResultBlock
object
Code execution result with encrypted stdout for PFC + websearch results.
5 properties
5 required
BetaToolSearchToolRegex_20251119
object
6 properties
2 required
BetaCacheMissToolsChanged
object
2 properties
2 required
BetaResponseThinkingBlock
object
3 properties
3 required
BetaServerToolCaller_20260120
object
2 properties
2 required
BetaRequestBashCodeExecutionOutputBlock
object
2 properties
2 required
BetaClearThinking20251015
object
2 properties
1 required
BetaRequestAdvisorRedactedResultBlock
object
3 properties
2 required
BetaWebSearchTool_20260209
object
10 properties
2 required
BetaUsage
object
12 properties
12 required
BetaInputContentBlock
BetaRequestBashCodeExecutionResultBlock
object
5 properties
5 required
BetaRequestBrowserStateBlock
object
The caller's browser state after a browser toolset member call — the full inventory of open tabs, which tab is active, and any side effects (tabs opened, downl…
4 properties
2 required
BetaRequestAdvisorToolResultBlock
object
4 properties
3 required
BetaMCPToolConfig
object
Configuration for a specific tool in an MCP toolset.
2 properties
BetaComputerRightClickConfig
object
rightclick's config overrides.
2 properties
BetaRequestWebSearchResultBlock
object
5 properties
4 required
BetaRequestWebSearchToolResultError
object
2 properties
2 required
BetaRequestWebSearchResultLocationCitation
object
5 properties
5 required
BetaComputerHoldKeyConfig
object
holdkey's config overrides.
2 properties
BetaWebSearchTool_20250305
object
10 properties
2 required
BetaFallbackCreditUsage
object
Outcome of the fallbackcredittoken presented on this request.
1 property
1 required
BetaToolChangeToolReference
object
Reference to a single tool the caller declared directly in tools[]. Does not accept the composed {server}{name} form the server assigns to MCP-resolved tools —…
2 properties
2 required
BetaCacheMissModelChanged
object
2 properties
2 required
BetaContentBlock
BetaURLPDFSource
object
2 properties
2 required
BetaRequestContainerUploadBlock
object
A content block that represents a file to be uploaded to the container Files uploaded via this block will be available in the container's input directory.
3 properties
2 required
BetaResponseTextEditorCodeExecutionStrReplaceResultBlock
object
6 properties
6 required
BetaResponseTextBlock
object
3 properties
3 required
BetaRequestToolSearchToolResultBlock
object
4 properties
3 required
BetaToolSearchToolResultErrorCode
string
BetaRequestMCPServerURLDefinition
object
5 properties
3 required
BetaRequestThinkingBlock
object
3 properties
3 required
BetaResponseWebSearchResultBlock
object
5 properties
5 required
BetaFallbackConfigV2
object
One entry in the fallbacks chain on a /v1/messages request. model is required. The override fields (maxtokens, thinking, outputconfig, and speed) set the corre…
5 properties
1 required
BetaComputerMiddleClickConfig
object
middleclick's config overrides.
2 properties
BetaAdvisorMessageIterationUsage
object
Token usage for an advisor sub-inference iteration.
7 properties
7 required
BetaBrowserTripleClickConfig
object
tripleclick's config overrides.
2 properties
Model
The model that will complete your prompt. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
BetaResponseTextEditorCodeExecutionViewResultBlock
object
6 properties
6 required
BetaWebSearchToolResultErrorCode
string
BetaResponseContextManagement
object
1 property
1 required
BetaAPIError
object
2 properties
2 required
BetaThinkingConfigParam
Configuration for enabling Claude's extended thinking. When enabled, responses include thinking content blocks showing Claude's thinking process before the fin…
BetaComputerToolset_20260801
object
The computer toolset: a single tools[] entry (carrying no name) that declares the computer tool family. The model is served the family's tool with any members…
4 properties
1 required
BetaBase64ImageSource
object
3 properties
3 required
BetaRequestRedactedThinkingBlock
object
2 properties
2 required
BetaCompact20260112
object
Automatically compact older context when reaching the configured trigger threshold.
4 properties
1 required
BetaRateLimitError
object
2 properties
2 required
BetaRequestContentBlockLocationCitation
object
6 properties
6 required
BetaRequestCompactionBlock
object
A compaction block containing summary of previous context. Users should round-trip these blocks from responses to subsequent requests to maintain context acros…
4 properties
1 required
BetaRequestAdvisorToolResultError
object
2 properties
2 required
BetaBrowserStateChangeTabOpened
object
A tab this call's execution opened that remains open at its end — the creation delta of the tabs inventory, not an event log. Carries only the tabid; the tab's…
2 properties
2 required
BetaRequestMCPServerToolConfiguration
object
2 properties
BetaCodeExecutionTool_20250522
object
6 properties
2 required
BetaEffortLevel
string
All possible effort levels.
BetaJsonValue
BetaResponseAdvisorToolResultBlock
object
3 properties
3 required
BetaResponseMCPToolResultBlock
object
4 properties
4 required
BetaResponseDocumentBlock
object
4 properties
4 required
BetaComputerKeyConfig
object
key's config overrides.
2 properties
BetaBrowserNewTabConfig
object
newtab's config overrides.
2 properties
BetaComputerDoubleClickConfig
object
doubleclick's config overrides.
2 properties
BetaContainer
object
Information about the container used in the request (for the code execution tool)
3 properties
3 required
BetaComputerTripleClickConfig
object
tripleclick's config overrides.
2 properties
BetaToolUsesTrigger
object
2 properties
2 required
BetaTextEditor_20250728
object
8 properties
2 required
BetaResponseCompactionBlock
object
A compaction block returned when autocompact is triggered. When content is None, it indicates the compaction failed to produce a valid summary (e.g., malformed…
3 properties
3 required
BetaRequestImageTransformations
object
Configures the transformations the server applies to this image before the model observes it. Each key names a condition the server transforms images for; its…
1 property
BetaComputerMouseMoveConfig
object
mousemove's config overrides.
2 properties
BetaResponseCharLocationCitation
object
7 properties
7 required
BetaResponseMCPToolUseBlock
object
5 properties
5 required
BetaResponseServerToolUseBlock
object
5 properties
4 required
BetaResponseFallbackBlock
object
Marks the point in content where one model's output gives way to the next. One block appears per hop where a preceding model actually ran this turn and decline…
4 properties
4 required
BetaToolChangeMCPToolReference
object
Reference to a single MCP tool by its server and remote name — the same servername/name pair mcptooluse carries.
3 properties
3 required
BetaCacheMissPreviousMessageNotFound
object
1 property
1 required
BetaResponseCodeExecutionOutputBlock
object
2 properties
2 required
BetaTool
object
10 properties
2 required
BetaPlainTextSource
object
3 properties
3 required
BetaResponseCodeExecutionResultBlock
object
5 properties
5 required
BetaBrowserHoldKeyConfig
object
holdkey's config overrides.
2 properties
BetaInvalidRequestError
object
2 properties
2 required
BetaRequestServerToolUseBlock
object
6 properties
4 required
BetaBashCodeExecutionToolResultErrorCode
string
BetaRequestToolSearchToolResultError
object
3 properties
2 required
BetaBrowserToolsetConfigs
object
Per-member configuration for browsertoolset20260801: one optional field per member tool, keyed by the member name — the same name the member's tooluse blocks c…
31 properties
BetaBrowserKeyConfig
object
key's config overrides.
2 properties
BetaThinkingDisplayMode
string
BetaWebFetchTool_20250910
object
11 properties
2 required
BetaToolSearchToolBM25_20251119
object
6 properties
2 required
BetaBrowserMiddleClickConfig
object
middleclick's config overrides.
2 properties
BetaRequestPageLocationCitation
object
6 properties
6 required
BetaToolChoiceAuto
object
The model will automatically decide whether to use tools.
2 properties
1 required
BetaComputerUseTool_20250124
object
10 properties
4 required
BetaBrowserHoverConfig
object
hover's config overrides.
2 properties
BetaResponseEncryptedCodeExecutionResultBlock
object
Code execution result with encrypted stdout for PFC + websearch results.
5 properties
5 required
BetaResponseBashCodeExecutionOutputBlock
object
2 properties
2 required
BetaBrowserFileUploadConfig
object
fileupload's config overrides.
2 properties
BetaRequestTextBlock
object
4 properties
2 required
BetaCodeExecutionTool_20260120
object
Code execution tool with REPL state persistence (daemon mode + gVisor checkpoint).
6 properties
2 required
BetaFallbackCreditRedeemed
object
The reprice was applied: the retry is billed as if the conversation had been on the retry model all along.
1 property
1 required
BetaResponseToolSearchToolSearchResultBlock
object
2 properties
2 required
BetaResponseAdvisorToolResultError
object
2 properties
2 required
BetaBrowserLeftClickDragConfig
object
leftclickdrag's config overrides.
2 properties
BetaBrowserLeftMouseDownConfig
object
leftmousedown's config overrides.
2 properties
BetaCacheMissUnavailable
object
1 property
1 required
BetaBrowserToolset_20260801
object
The browser toolset: a single tools[] entry (carrying no name) that declares the browser tool family. The model is served the family's tool with any members di…
4 properties
1 required
BetaMetadata
object
1 property
BetaSkill
object
A skill that was loaded in a container (response model).
3 properties
3 required
BetaRequestMCPToolResultBlock
object
5 properties
2 required
BetaAdvisorTool_20260301
object
10 properties
3 required
BetaBrowserZoomConfig
object
zoom's config overrides.
2 properties
BetaRequestFallbackHopInfo
object
Identifies one hop of a fallback transition.
1 property
1 required
BetaSpeed
string
Inference speed mode. fast provides significantly faster output token generation at premium pricing. Not all models support fast; invalid combinations are reje…
BetaToolChangeMCPToolsetReference
object
Reference to every tool in the named MCP server's toolset.
2 properties
2 required
BetaToolChoiceNone
object
The model will not be allowed to use tools.
1 property
1 required
BetaResponseClearThinking20251015Edit
object
3 properties
3 required
BetaResponseTextEditorCodeExecutionCreateResultBlock
object
2 properties
2 required
BetaResponseTextEditorCodeExecutionToolResultError
object
3 properties
3 required
BetaRequestToolReferenceBlock
object
Tool reference block that can be included in toolresult content.
3 properties
2 required
BetaResponseClearToolUses20250919Edit
object
3 properties
3 required
BetaRequestBashCodeExecutionToolResultError
object
2 properties
2 required
BetaBrowserCloseTabConfig
object
closetab's config overrides.
2 properties
BetaRequestSearchResultLocationCitation
object
7 properties
7 required
BetaBrowserStateChangeDownloadCompleted
object
A file download that finished during this call, reported with the same downloadid as its downloadstarted — or without a prior downloadstarted, when the downloa…
5 properties
3 required
BetaRequestWebFetchToolResultError
object
2 properties
2 required
BetaRequestWebSearchToolResultBlock
object
5 properties
3 required
BetaOverloadedError
object
2 properties
2 required
BetaBrowserFindConfig
object
find's config overrides.
2 properties
BetaBillingError
object
2 properties
2 required
BetaRequestWebFetchResultBlock
object
4 properties
3 required
BetaFallbackCreditNotApplied
object
No reprice was applied; reason says why.
3 properties
2 required
BetaOutputConfig
object
3 properties
BetaAdvisorToolResultErrorCode
string
BetaRequestCodeExecutionOutputBlock
object
2 properties
2 required
BetaResponseToolReferenceBlock
object
2 properties
2 required
BetaResponseBashCodeExecutionToolResultError
object
2 properties
2 required
BetaRequestAdvisorResultBlock
object
3 properties
2 required
BetaContainerParams
object
Container parameters with skills to be loaded.
2 properties
BetaResponseToolUseBlock
object
6 properties
4 required
BetaRequestWebFetchToolResultBlock
object
5 properties
3 required
BetaBrowserScreenshotConfig
object
screenshot's config overrides.
2 properties
BetaCompactionIterationUsage
object
Token usage for a compaction iteration.
6 properties
6 required
BetaRequestCodeExecutionToolResultError
object
2 properties
2 required
BetaResponseBashCodeExecutionResultBlock
object
5 properties
5 required
BetaAllowedCaller
string
Specifies who can invoke a tool. Values: direct: The model can call this tool directly. codeexecution20250825: The tool can be called from the code execution e…
BetaBrowserDoubleClickConfig
object
doubleclick's config overrides.
2 properties
BetaRequestCodeExecutionResultBlock
object
5 properties
5 required
BetaAuthenticationError
object
2 properties
2 required
BetaRequestCodeExecutionToolResultBlock
object
4 properties
3 required
BetaNotFoundError
object
2 properties
2 required
BetaComputerZoomConfig
object
zoom's config overrides.
2 properties
BetaRequestBashCodeExecutionToolResultBlock
object
4 properties
3 required
BetaBrowserListTabsConfig
object
listtabs's config overrides.
2 properties
BetaBrowserMouseMoveConfig
object
mousemove's config overrides.
2 properties
BetaClearToolUses20250919
object
6 properties
1 required
BetaWebFetchTool_20260209
object
11 properties
2 required
BetaResponseRedactedThinkingBlock
object
2 properties
2 required
BetaToolChoiceTool
object
The model will use the specified tool with toolchoice.name.
3 properties
2 required
BetaURLImageSource
object
2 properties
2 required
BetaBrowserStateChangeDownloadStarted
object
A file download that started during this call.
3 properties
3 required
BetaPermissionError
object
2 properties
2 required
BetaTextEditor_20250124
object
7 properties
2 required
BetaResponseContainerUploadBlock
object
Response model for a file uploaded to the container.
2 properties
2 required
BetaRequestTextEditorCodeExecutionToolResultError
object
3 properties
2 required
BetaBrowserFormInputConfig
object
forminput's config overrides.
2 properties
BetaThinkingConfigEnabled
object
3 properties
2 required
BetaTextEditor_20241022
object
7 properties
2 required
BetaBrowserScrollConfig
object
scroll's config overrides.
2 properties
BetaToolChoice
How the model should use the provided tools. The model can use a specific tool, any available tool, decide by itself, or not use tools at all.
BetaMCPToolset
object
Configuration for a group of tools from an MCP server. Allows configuring enabled status and deferloading for all tools from an MCP server, with optional per-t…
5 properties
2 required
BetaContextManagementConfig
object
1 property
BetaRequestTextEditorCodeExecutionStrReplaceResultBlock
object
6 properties
1 required
BetaServerToolUsage
object
2 properties
2 required
BetaCodeExecutionToolResultErrorCode
string
BetaThinkingConfigDisabled
object
1 property
1 required
BetaBrowserScrollToConfig
object
scrollto's config overrides.
2 properties
BetaBrowserStateTabEntry
object
One open browser tab reported in a browserstate block's tabs inventory. tabid is the caller-assigned identifier for the tab; title and url describe the page th…
4 properties
3 required
BetaFallbackCreditTokenParam
object
Object form of fallbackcredittoken: the token plus a redemption mode. Requires anthropic-beta: fallback-credit-2026-07-01; without that header the field accept…
2 properties
1 required
BetaServerToolCaller
object
Tool invocation generated by a server-side tool.
2 properties
2 required
BetaFileImageSource
object
2 properties
2 required
BetaBrowserNavigateConfig
object
navigate's config overrides.
2 properties
BetaComputerLeftClickDragConfig
object
leftclickdrag's config overrides.
2 properties
BetaRequestCharLocationCitation
object
6 properties
6 required
BetaBrowserReadPageConfig
object
readpage's config overrides.
2 properties
BetaMCPToolDefaultConfig
object
Default configuration for tools in an MCP toolset.
2 properties
BetaRequestSearchResultBlock
object
6 properties
4 required
BetaBrowserSwitchTabConfig
object
switchtab's config overrides.
2 properties
BetaErrorResponse
object
3 properties
3 required
BetaThinkingTurns
object
2 properties
2 required
BetaResponseWebFetchToolResultBlock
object
4 properties
3 required
BetaResponseAdvisorResultBlock
object
3 properties
3 required
AnthropicBeta
BetaRequestFallbackBlock
object
A fallback block echoed back from a prior response. Accepted in messages[].content and not rendered into the prompt; not validated against the request's fallba…
4 properties
3 required
BetaBrowserLeftClickConfig
object
leftclick's config overrides.
2 properties
BetaMessage
object
12 properties
12 required
BetaDiagnosticsParam
object
Request-level diagnostics. Currently carries the previous response id for prompt-cache divergence reporting.
1 property
BetaToolUsesKeep
object
2 properties
2 required
Specification
The full machine-readable OpenAPI contract behind this narrative.
Source
More from Anthropic 12
Other APIs Anthropic publishes across the network.
Anthropic Messages API
Anthropic Models API
Anthropic Files API
Anthropic Skills API
Anthropic Agents API
Anthropic Api Keys API
Anthropic Cost API
Anthropic Environments API
Anthropic Events API
Anthropic Organization API
Anthropic Organization Invites API
Anthropic Organization Members API
#Messages?beta=true
Where this information came from
This is an independent, third-party profile of Anthropic Messages?beta=true API, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.
The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.
Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.
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