Vapi Sessions API
Stateful sessions that persist conversation history across calls and chats so an assistant can pick up where the customer left off.
OpenAPI Specification
openapi: 3.0.0
info:
title: Vapi Sessions API
description: Vapi API — Sessions resource. Voice AI for developers.
version: '1.0'
contact:
name: Vapi
url: https://vapi.ai
servers:
- url: https://api.vapi.ai
security:
- bearer: []
tags:
- name: Sessions
description: Sessions endpoints.
paths:
/session:
post:
operationId: SessionController_create
summary: Create Session
parameters: []
requestBody:
required: true
content:
application/json:
schema:
$ref: '#/components/schemas/CreateSessionDTO'
responses:
'201':
description: ''
content:
application/json:
schema:
$ref: '#/components/schemas/Session'
tags:
- Sessions
security:
- bearer: []
get:
operationId: SessionController_findAllPaginated
summary: List Sessions
parameters:
- name: id
required: false
in: query
description: This is the unique identifier for the session to filter by.
schema:
type: string
- name: name
required: false
in: query
description: This is the name of the session to filter by.
schema:
type: string
- name: assistantId
required: false
in: query
description: This is the ID of the assistant to filter sessions by.
schema:
type: string
- name: assistantIdAny
required: false
in: query
description: Filter by multiple assistant IDs. Provide as comma-separated values.
schema:
example: assistant-1,assistant-2,assistant-3
type: string
- name: squadId
required: false
in: query
description: This is the ID of the squad to filter sessions by.
schema:
type: string
- name: workflowId
required: false
in: query
description: This is the ID of the workflow to filter sessions by.
schema:
type: string
- required: false
description: 'This is the flag to toggle the E164 check for the `number` field. This is an advanced property which
should be used if you know your use case requires it.
Use cases:
- `false`: To allow non-E164 numbers like `+001234567890`, `1234`, or `abc`. This is useful for dialing out to non-E164
numbers on your SIP trunks.
- `true` (default): To allow only E164 numbers like `+14155551234`. This is standard for PSTN calls.
If `false`, the `number` is still required to only contain alphanumeric characters (regex: `/^\+?[a-zA-Z0-9]+$/`).
@default true (E164 check is enabled)'
name: numberE164CheckEnabled
in: query
schema:
default: true
type: boolean
- required: false
description: This is the extension that will be dialed after the call is answered.
name: extension
in: query
schema:
maxLength: 10
example: null
type: string
- name: assistantOverrides
required: false
description: 'These are the overrides for the assistant''s settings and template variables specific to this customer.
This allows customization of the assistant''s behavior for individual customers in batch calls.'
allOf:
- $ref: '#/components/schemas/AssistantOverrides'
in: query
schema: {}
- required: false
description: This is the number of the customer.
name: number
in: query
schema:
minLength: 3
maxLength: 40
type: string
- required: false
description: This is the SIP URI of the customer.
name: sipUri
in: query
schema:
type: string
- required: false
description: 'This is the name of the customer. This is just for your own reference.
For SIP inbound calls, this is extracted from the `From` SIP header with format `"Display Name" <sip:username@domain>`.'
name: name
in: query
schema:
maxLength: 40
type: string
- required: false
description: This is the email of the customer.
name: email
in: query
schema:
maxLength: 40
type: string
- required: false
description: This is the external ID of the customer.
name: externalId
in: query
schema:
maxLength: 40
type: string
- name: customerNumberAny
required: false
in: query
description: Filter by any of the specified customer phone numbers (comma-separated).
schema:
example: +1234567890,+0987654321
type: string
- name: phoneNumberId
required: false
in: query
description: This will return sessions with the specified phoneNumberId.
schema:
type: string
- name: phoneNumberIdAny
required: false
in: query
description: This will return sessions with any of the specified phoneNumberIds.
schema:
type: array
items:
type: string
- name: page
required: false
in: query
description: This is the page number to return. Defaults to 1.
schema:
minimum: 1
type: number
- name: sortOrder
required: false
in: query
description: This is the sort order for pagination. Defaults to 'DESC'.
schema:
enum:
- ASC
- DESC
type: string
- name: sortBy
required: false
in: query
description: This is the column to sort by. Defaults to 'createdAt'.
schema:
enum:
- createdAt
- duration
- cost
type: string
- name: limit
required: false
in: query
description: This is the maximum number of items to return. Defaults to 100.
schema:
minimum: 0
maximum: 1000
type: number
- name: createdAtGt
required: false
in: query
description: This will return items where the createdAt is greater than the specified value.
schema:
format: date-time
type: string
- name: createdAtLt
required: false
in: query
description: This will return items where the createdAt is less than the specified value.
schema:
format: date-time
type: string
- name: createdAtGe
required: false
in: query
description: This will return items where the createdAt is greater than or equal to the specified value.
schema:
format: date-time
type: string
- name: createdAtLe
required: false
in: query
description: This will return items where the createdAt is less than or equal to the specified value.
schema:
format: date-time
type: string
- name: updatedAtGt
required: false
in: query
description: This will return items where the updatedAt is greater than the specified value.
schema:
format: date-time
type: string
- name: updatedAtLt
required: false
in: query
description: This will return items where the updatedAt is less than the specified value.
schema:
format: date-time
type: string
- name: updatedAtGe
required: false
in: query
description: This will return items where the updatedAt is greater than or equal to the specified value.
schema:
format: date-time
type: string
- name: updatedAtLe
required: false
in: query
description: This will return items where the updatedAt is less than or equal to the specified value.
schema:
format: date-time
type: string
responses:
'200':
description: ''
content:
application/json:
schema:
$ref: '#/components/schemas/SessionPaginatedResponse'
tags:
- Sessions
security:
- bearer: []
/session/{id}:
get:
operationId: SessionController_findOne
summary: Get Session
parameters:
- name: id
required: true
in: path
description: The unique identifier for the resource.
schema:
format: uuid
type: string
responses:
'200':
description: ''
content:
application/json:
schema:
$ref: '#/components/schemas/Session'
tags:
- Sessions
security:
- bearer: []
patch:
operationId: SessionController_update
summary: Update Session
parameters:
- name: id
required: true
in: path
description: The unique identifier for the resource.
schema:
format: uuid
type: string
requestBody:
required: true
content:
application/json:
schema:
$ref: '#/components/schemas/UpdateSessionDTO'
responses:
'200':
description: ''
content:
application/json:
schema:
$ref: '#/components/schemas/Session'
tags:
- Sessions
security:
- bearer: []
delete:
operationId: SessionController_remove
summary: Delete Session
parameters:
- name: id
required: true
in: path
description: The unique identifier for the resource.
schema:
format: uuid
type: string
responses:
'200':
description: ''
content:
application/json:
schema:
$ref: '#/components/schemas/Session'
tags:
- Sessions
security:
- bearer: []
components:
securitySchemes:
bearer:
scheme: bearer
bearerFormat: Bearer
type: http
description: Retrieve your API Key from [Dashboard](dashboard.vapi.ai).
schemas:
AWSIAMCredentialsAuthenticationPlan:
type: object
properties:
type:
type: string
enum:
- aws-iam
awsAccessKeyId:
type: string
description: AWS Access Key ID. This is not returned in the API.
maxLength: 128
awsSecretAccessKey:
type: string
description: AWS Secret Access Key. This is not returned in the API.
maxLength: 256
required:
- type
- awsAccessKeyId
- awsSecretAccessKey
AWSStsAuthenticationPlan:
type: object
properties:
type:
type: string
description: This is the type of authentication plan
enum:
- aws-sts
roleArn:
type: string
description: This is the role ARN for the AWS credential
externalId:
type: string
description: Optional external ID for additional security in the role trust policy.
maxLength: 256
required:
- type
- roleArn
AnalysisCost:
type: object
properties:
type:
type: string
description: This is the type of cost, always 'analysis' for this class.
enum:
- analysis
analysisType:
type: string
description: This is the type of analysis performed.
enum:
- summary
- structuredData
- successEvaluation
- structuredOutput
model:
type: object
description: This is the model that was used to perform the analysis.
promptTokens:
type: number
description: This is the number of prompt tokens used in the analysis.
completionTokens:
type: number
description: This is the number of completion tokens generated in the analysis.
cachedPromptTokens:
type: number
description: This is the number of cached prompt tokens used in the analysis. This is only applicable to certain
providers (e.g., OpenAI, Azure OpenAI) that support prompt caching. Cached tokens are billed at a discounted rate.
cost:
type: number
description: This is the cost of the component in USD.
required:
- type
- analysisType
- model
- promptTokens
- completionTokens
- cost
AnalysisPlan:
type: object
properties:
minMessagesThreshold:
type: number
description: 'The minimum number of messages required to run the analysis plan.
If the number of messages is less than this, analysis will be skipped.
@default 2'
deprecated: true
minimum: 0
summaryPlan:
description: This is the plan for generating the summary of the call. This outputs to `call.analysis.summary`.
deprecated: true
allOf:
- $ref: '#/components/schemas/SummaryPlan'
structuredDataPlan:
description: This is the plan for generating the structured data from the call. This outputs to `call.analysis.structuredData`.
deprecated: true
allOf:
- $ref: '#/components/schemas/StructuredDataPlan'
structuredDataMultiPlan:
description: This is an array of structured data plan catalogs. Each entry includes a `key` and a `plan` for generating
the structured data from the call. This outputs to `call.analysis.structuredDataMulti`.
deprecated: true
type: array
items:
$ref: '#/components/schemas/StructuredDataMultiPlan'
successEvaluationPlan:
description: This is the plan for generating the success evaluation of the call. This outputs to `call.analysis.successEvaluation`.
deprecated: true
allOf:
- $ref: '#/components/schemas/SuccessEvaluationPlan'
outcomeIds:
description: 'This is an array of outcome UUIDs to be calculated during analysis.
The outcomes will be calculated and stored in `call.analysis.outcomes`.'
deprecated: true
type: array
items:
type: string
AnthropicBedrockModel:
type: object
properties:
messages:
description: This is the starting state for the conversation.
type: array
items:
$ref: '#/components/schemas/OpenAIMessage'
tools:
type: array
description: 'These are the tools that the assistant can use during the call. To use existing tools, use `toolIds`.
Both `tools` and `toolIds` can be used together.'
items:
oneOf:
- $ref: '#/components/schemas/CreateApiRequestToolDTO'
title: ApiRequestTool
- $ref: '#/components/schemas/CreateBashToolDTO'
title: BashTool
- $ref: '#/components/schemas/CreateCodeToolDTO'
title: CodeTool
- $ref: '#/components/schemas/CreateComputerToolDTO'
title: ComputerTool
- $ref: '#/components/schemas/CreateDtmfToolDTO'
title: DtmfTool
- $ref: '#/components/schemas/CreateEndCallToolDTO'
title: EndCallTool
- $ref: '#/components/schemas/CreateFunctionToolDTO'
title: FunctionTool
- $ref: '#/components/schemas/CreateGoHighLevelCalendarAvailabilityToolDTO'
title: GoHighLevelCalendarAvailabilityTool
- $ref: '#/components/schemas/CreateGoHighLevelCalendarEventCreateToolDTO'
title: GoHighLevelCalendarEventCreateTool
- $ref: '#/components/schemas/CreateGoHighLevelContactCreateToolDTO'
title: GoHighLevelContactCreateTool
- $ref: '#/components/schemas/CreateGoHighLevelContactGetToolDTO'
title: GoHighLevelContactGetTool
- $ref: '#/components/schemas/CreateGoogleCalendarCheckAvailabilityToolDTO'
title: GoogleCalendarCheckAvailabilityTool
- $ref: '#/components/schemas/CreateGoogleCalendarCreateEventToolDTO'
title: GoogleCalendarCreateEventTool
- $ref: '#/components/schemas/CreateGoogleSheetsRowAppendToolDTO'
title: GoogleSheetsRowAppendTool
- $ref: '#/components/schemas/CreateHandoffToolDTO'
title: HandoffTool
- $ref: '#/components/schemas/CreateMcpToolDTO'
title: McpTool
- $ref: '#/components/schemas/CreateQueryToolDTO'
title: QueryTool
- $ref: '#/components/schemas/CreateSlackSendMessageToolDTO'
title: SlackSendMessageTool
- $ref: '#/components/schemas/CreateSmsToolDTO'
title: SmsTool
- $ref: '#/components/schemas/CreateTextEditorToolDTO'
title: TextEditorTool
- $ref: '#/components/schemas/CreateTransferCallToolDTO'
title: TransferCallTool
- $ref: '#/components/schemas/CreateSipRequestToolDTO'
title: SipRequestTool
- $ref: '#/components/schemas/CreateVoicemailToolDTO'
title: VoicemailTool
toolIds:
description: 'These are the tools that the assistant can use during the call. To use transient tools, use `tools`.
Both `tools` and `toolIds` can be used together.'
type: array
items:
type: string
knowledgeBase:
description: These are the options for the knowledge base.
oneOf:
- $ref: '#/components/schemas/CreateCustomKnowledgeBaseDTO'
title: Custom
provider:
type: string
description: The provider identifier for Anthropic via AWS Bedrock.
enum:
- anthropic-bedrock
model:
type: string
description: The specific Anthropic/Claude model that will be used via Bedrock.
enum:
- claude-3-opus-20240229
- claude-3-sonnet-20240229
- claude-3-haiku-20240307
- claude-3-5-sonnet-20240620
- claude-3-5-sonnet-20241022
- claude-3-5-haiku-20241022
- claude-3-7-sonnet-20250219
- claude-opus-4-20250514
- claude-opus-4-5-20251101
- claude-opus-4-6
- claude-sonnet-4-20250514
- claude-sonnet-4-5-20250929
- claude-sonnet-4-6
- claude-haiku-4-5-20251001
thinking:
description: 'Optional configuration for Anthropic''s thinking feature.
Only applicable for claude-3-7-sonnet-20250219 model.
If provided, maxTokens must be greater than thinking.budgetTokens.'
allOf:
- $ref: '#/components/schemas/AnthropicThinkingConfig'
temperature:
type: number
description: This is the temperature that will be used for calls. Default is 0 to leverage caching for lower latency.
minimum: 0
maximum: 2
maxTokens:
type: number
description: This is the max number of tokens that the assistant will be allowed to generate in each turn of the
conversation. Default is 250.
minimum: 50
maximum: 10000
emotionRecognitionEnabled:
type: boolean
description: 'This determines whether we detect user''s emotion while they speak and send it as an additional info
to model.
Default `false` because the model is usually are good at understanding the user''s emotion from text.
@default false'
numFastTurns:
type: number
description: 'This sets how many turns at the start of the conversation to use a smaller, faster model from the
same provider before switching to the primary model. Example, gpt-3.5-turbo if provider is openai.
Default is 0.
@default 0'
minimum: 0
required:
- provider
- model
AnthropicModel:
type: object
properties:
messages:
description: This is the starting state for the conversation.
type: array
items:
$ref: '#/components/schemas/OpenAIMessage'
tools:
type: array
description: 'These are the tools that the assistant can use during the call. To use existing tools, use `toolIds`.
Both `tools` and `toolIds` can be used together.'
items:
oneOf:
- $ref: '#/components/schemas/CreateApiRequestToolDTO'
title: ApiRequestTool
- $ref: '#/components/schemas/CreateBashToolDTO'
title: BashTool
- $ref: '#/components/schemas/CreateCodeToolDTO'
title: CodeTool
- $ref: '#/components/schemas/CreateComputerToolDTO'
title: ComputerTool
- $ref: '#/components/schemas/CreateDtmfToolDTO'
title: DtmfTool
- $ref: '#/components/schemas/CreateEndCallToolDTO'
title: EndCallTool
- $ref: '#/components/schemas/CreateFunctionToolDTO'
title: FunctionTool
- $ref: '#/components/schemas/CreateGoHighLevelCalendarAvailabilityToolDTO'
title: GoHighLevelCalendarAvailabilityTool
- $ref: '#/components/schemas/CreateGoHighLevelCalendarEventCreateToolDTO'
title: GoHighLevelCalendarEventCreateTool
- $ref: '#/components/schemas/CreateGoHighLevelContactCreateToolDTO'
title: GoHighLevelContactCreateTool
- $ref: '#/components/schemas/CreateGoHighLevelContactGetToolDTO'
title: GoHighLevelContactGetTool
- $ref: '#/components/schemas/CreateGoogleCalendarCheckAvailabilityToolDTO'
title: GoogleCalendarCheckAvailabilityTool
- $ref: '#/components/schemas/CreateGoogleCalendarCreateEventToolDTO'
title: GoogleCalendarCreateEventTool
- $ref: '#/components/schemas/CreateGoogleSheetsRowAppendToolDTO'
title: GoogleSheetsRowAppendTool
- $ref: '#/components/schemas/CreateHandoffToolDTO'
title: HandoffTool
- $ref: '#/components/schemas/CreateMcpToolDTO'
title: McpTool
- $ref: '#/components/schemas/CreateQueryToolDTO'
title: QueryTool
- $ref: '#/components/schemas/CreateSlackSendMessageToolDTO'
title: SlackSendMessageTool
- $ref: '#/components/schemas/CreateSmsToolDTO'
title: SmsTool
- $ref: '#/components/schemas/CreateTextEditorToolDTO'
title: TextEditorTool
- $ref: '#/components/schemas/CreateTransferCallToolDTO'
title: TransferCallTool
- $ref: '#/components/schemas/CreateSipRequestToolDTO'
title: SipRequestTool
- $ref: '#/components/schemas/CreateVoicemailToolDTO'
title: VoicemailTool
toolIds:
description: 'These are the tools that the assistant can use during the call. To use transient tools, use `tools`.
Both `tools` and `toolIds` can be used together.'
type: array
items:
type: string
knowledgeBase:
description: These are the options for the knowledge base.
oneOf:
- $ref: '#/components/schemas/CreateCustomKnowledgeBaseDTO'
title: Custom
model:
type: string
description: The specific Anthropic/Claude model that will be used.
enum:
- claude-3-opus-20240229
- claude-3-sonnet-20240229
- claude-3-haiku-20240307
- claude-3-5-sonnet-20240620
- claude-3-5-sonnet-20241022
- claude-3-5-haiku-20241022
- claude-3-7-sonnet-20250219
- claude-opus-4-20250514
- claude-opus-4-5-20251101
- claude-opus-4-6
- claude-sonnet-4-20250514
- claude-sonnet-4-5-20250929
- claude-sonnet-4-6
- claude-haiku-4-5-20251001
provider:
type: string
description: The provider identifier for Anthropic.
enum:
- anthropic
thinking:
description: 'Optional configuration for Anthropic''s thinking feature.
Only applicable for claude-3-7-sonnet-20250219 model.
If provided, maxTokens must be greater than thinking.budgetTokens.'
allOf:
- $ref: '#/components/schemas/AnthropicThinkingConfig'
temperature:
type: number
description: This is the temperature that will be used for calls. Default is 0 to leverage caching for lower latency.
minimum: 0
maximum: 2
maxTokens:
type: number
description: This is the max number of tokens that the assistant will be allowed to generate in each turn of the
conversation. Default is 250.
minimum: 50
maximum: 10000
emotionRecognitionEnabled:
type: boolean
description: 'This determines whether we detect user''s emotion while they speak and send it as an additional info
to model.
Default `false` because the model is usually are good at understanding the user''s emotion from text.
@default false'
numFastTurns:
type: number
description: 'This sets how many turns at the start of the conversation to use a smaller, faster model from the
same provider before switching to the primary model. Example, gpt-3.5-turbo if provider is openai.
Default is 0.
@default 0'
minimum: 0
required:
- model
- provider
AnthropicThinkingConfig:
type: object
properties:
type:
type: string
enum:
- enabled
budgetTokens:
type: number
description: 'The maximum number of tokens to allocate for thinking.
Must be between 1024 and 100000 tokens.'
minimum: 1024
maximum: 100000
required:
- type
- budgetTokens
AnyscaleModel:
type: object
properties:
messages:
description: This is the starting state for the conversation.
type: array
items:
$ref: '#/components/schemas/OpenAIMessage'
tools:
type: array
description: 'These are the tools that the assistant can use during the call. To use existing tools, use `toolIds`.
Both `tools` and `toolIds` can be used together.'
items:
oneOf:
- $ref: '#/components/schemas/CreateApiRequestToolDTO'
title: ApiRequestTool
- $ref: '#/components/schemas/CreateBashToolDTO'
title: BashTool
- $ref: '#/components/schemas/CreateCodeToolDTO'
title: CodeTool
- $ref: '#/components/schemas/CreateComputerToolDTO'
title: ComputerTool
- $ref: '#/components/schemas/CreateDtmfToolDTO'
title: DtmfTool
- $ref: '#/components/schemas/CreateEndCallToolDTO'
title: EndCallTool
- $ref: '#/components/schemas/CreateFunctionToolDTO'
title: FunctionTool
- $ref: '#/components/schemas/CreateGoHighLevelCalendarAvailabilityToolDTO'
title: GoHighLevelCalendarAvailabilityTool
- $ref: '#/components/schemas/CreateGoHighLevelCalendarEventCreateToolDTO'
title: GoHighLevelCalendarEventCreateTool
- $ref: '#/components/schemas/CreateGoHighLevelContactCreateToolDTO'
title: GoHighLevelContactCreateTool
- $ref: '#/components/schemas/CreateGoHighLevelContactGetToolDTO'
title: GoHighLevelContactGetTool
- $ref: '#/components/schemas/CreateGoogleCalendarCheckAvailabilityToolDTO'
title: GoogleCalendarCheckAvailabilityTool
- $ref: '#/components/schemas/CreateGoogleCalendarCreateEventToolDTO'
title: GoogleCalendarCreateEventTool
- $ref: '#/components/schemas/CreateGoogleSheetsRowAppendToolDTO'
title: GoogleSheetsRowAppendTool
- $ref: '#/components/schemas/CreateHandoffToolDTO'
title: HandoffTool
- $ref: '#/components/schemas/CreateMcpToolDTO'
title: McpTool
- $ref: '#/components/schemas/CreateQueryToolDTO'
title: QueryTool
- $ref: '#/components/schemas/CreateSlackSendMessageToolDTO'
title: SlackSendMessageTool
- $ref: '#/components/schemas/CreateSmsToolDTO'
title: SmsTool
- $ref: '#/components/schemas/CreateTextEditorToolDTO'
title: TextEditorTool
- $ref: '#/components/schemas/CreateTransferCallToolDTO'
title: TransferCallTool
- $ref: '#/components/schemas/CreateSipRequestToolDTO'
title: SipRequestTool
- $ref: '#/components/schemas/CreateVoicemailToolDTO'
title: VoicemailTool
toolIds:
description: 'These are the tools that the assistant can use during the call. To use transient tools, use `tools`.
Both `tools` and `toolIds` can be used together.'
type: array
items:
type: string
knowledgeBase:
description: These are the options for the knowledge base.
oneOf:
- $ref: '#/components/schemas/CreateCustomKnowledgeBaseDTO'
title: Custom
provider:
type: string
enum:
- anyscale
model:
type: string
description: This is the name of the model. Ex. cognitivecomputations/dolphin-mixtral-8x7b
temperature:
type: number
description: This is the temperature that will be used for calls. Default is 0 to leverage caching for lower latency.
minimum: 0
maximum: 2
maxTokens:
type: number
description: This is the max number of tokens that the assistant will be allowed to generate in each turn of the
conversation. Default is 250.
minimum: 50
maximum: 10000
emotionRecognitionEnabled:
type: boolean
description: 'This determines whether we detect user''s emotion while they speak and send it as an additional info
to model.
Default `false` because the model is usually are good at understanding the user''s emotion from text.
@default false'
numFastTurns:
type: number
description: 'This sets how many turns at the start of the conversation to use a smaller, faster model from the
same provider before switching to the primary model. Example, gpt-3.5-turbo if provider is openai.
Default is 0.
@default 0'
minimum: 0
required:
- provider
- model
Artifact:
type: object
properties:
messages:
type: array
description: These are the messages that were spoken during the call.
items:
oneOf:
- $ref: '#/components/schemas/UserMessage'
title: UserMessage
- $ref: '#/components/schemas/SystemMessage'
title: SystemMessage
- $ref: '#/components/schemas/BotMessage'
title: BotMessage
- $ref: '#/components/schemas/ToolCallMessage'
title: ToolCallMessage
- $ref: '#/components/schemas/ToolCallResultMessage'
title: ToolCallResultMessage
messagesOpenAIFormatted:
description: These are the messages that were spoken during the call, formatted for OpenAI.
type: array
items:
$ref: '#/components/schemas/OpenAIMessage'
recordingUrl:
type: string
description: This is the recording url for the call. To enable, set `assistant.artifactPlan.recordingEnabled`.
deprecated: true
stereoRecor
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