--- title: "Changes to Create a Dream" method: POST path: "/v1/dreams?beta=true" --- # Changes to Create a Dream `POST /v1/dreams?beta=true` > Every recorded change to this endpoint, newest first. ## Timeline Changed in 5 of 68 revisions. - **2026-09-01** `d1d189d791d1` — 30 breaking, 15 info - **2026-08-18** `d3515f9e9eca` — 45 breaking, 60 info - **2026-08-17** `d2b230555b7f` — 9 breaking, 1 warning, 6 info - **2026-08-10** `44837c80aabe` — 2 info - **2026-07-10** `7bab1831a710` — 1 info ## Changes - **2026-09-01** `d1d189d791d1` — 30 breaking, 15 info - added `#/components/schemas/BetaInvalidRequestError, #/components/schemas/BetaAuthenticationError, #/components/schemas/BetaBillingError, #/components/schemas/BetaPermissionError, #/components/schemas/BetaNotFoundError, #/components/schemas/BetaRateLimitError, #/components/schemas/BetaGatewayTimeoutError, #/components/schemas/BetaAPIError, #/components/schemas/BetaOverloadedError` to the `error` response property `oneOf` list for the response status `400` - added `#/components/schemas/BetaInvalidRequestError, #/components/schemas/BetaAuthenticationError, #/components/schemas/BetaBillingError, #/components/schemas/BetaPermissionError, #/components/schemas/BetaNotFoundError, #/components/schemas/BetaRateLimitError, #/components/schemas/BetaGatewayTimeoutError, #/components/schemas/BetaAPIError, #/components/schemas/BetaOverloadedError` to the `error` response property `oneOf` list for the response status `401` - added `#/components/schemas/BetaInvalidRequestError, #/components/schemas/BetaAuthenticationError, #/components/schemas/BetaBillingError, #/components/schemas/BetaPermissionError, #/components/schemas/BetaNotFoundError, #/components/schemas/BetaRateLimitError, #/components/schemas/BetaGatewayTimeoutError, #/components/schemas/BetaAPIError, #/components/schemas/BetaOverloadedError` to the `error` response property `oneOf` list for the response status `403` - added `#/components/schemas/BetaInvalidRequestError, #/components/schemas/BetaAuthenticationError, #/components/schemas/BetaBillingError, #/components/schemas/BetaPermissionError, #/components/schemas/BetaNotFoundError, #/components/schemas/BetaRateLimitError, #/components/schemas/BetaGatewayTimeoutError, #/components/schemas/BetaAPIError, #/components/schemas/BetaOverloadedError` to the `error` response property `oneOf` list for the response status `404` - added `#/components/schemas/BetaInvalidRequestError, #/components/schemas/BetaAuthenticationError, #/components/schemas/BetaBillingError, #/components/schemas/BetaPermissionError, #/components/schemas/BetaNotFoundError, #/components/schemas/BetaRateLimitError, #/components/schemas/BetaGatewayTimeoutError, #/components/schemas/BetaAPIError, #/components/schemas/BetaOverloadedError` to the `error` response property `oneOf` list for the response status `408` - added `#/components/schemas/BetaInvalidRequestError, #/components/schemas/BetaAuthenticationError, #/components/schemas/BetaBillingError, #/components/schemas/BetaPermissionError, #/components/schemas/BetaNotFoundError, #/components/schemas/BetaRateLimitError, #/components/schemas/BetaGatewayTimeoutError, #/components/schemas/BetaAPIError, #/components/schemas/BetaOverloadedError` to the `error` response property `oneOf` list for the response status `409` - added `#/components/schemas/BetaInvalidRequestError, #/components/schemas/BetaAuthenticationError, #/components/schemas/BetaBillingError, #/components/schemas/BetaPermissionError, #/components/schemas/BetaNotFoundError, #/components/schemas/BetaRateLimitError, #/components/schemas/BetaGatewayTimeoutError, #/components/schemas/BetaAPIError, #/components/schemas/BetaOverloadedError` to the `error` response property `oneOf` list for the response status `412` - added `#/components/schemas/BetaInvalidRequestError, #/components/schemas/BetaAuthenticationError, #/components/schemas/BetaBillingError, #/components/schemas/BetaPermissionError, #/components/schemas/BetaNotFoundError, #/components/schemas/BetaRateLimitError, #/components/schemas/BetaGatewayTimeoutError, #/components/schemas/BetaAPIError, #/components/schemas/BetaOverloadedError` to the `error` response property `oneOf` list for the response status `413` - added `#/components/schemas/BetaInvalidRequestError, #/components/schemas/BetaAuthenticationError, #/components/schemas/BetaBillingError, #/components/schemas/BetaPermissionError, #/components/schemas/BetaNotFoundError, #/components/schemas/BetaRateLimitError, #/components/schemas/BetaGatewayTimeoutError, #/components/schemas/BetaAPIError, #/components/schemas/BetaOverloadedError` to the `error` response property `oneOf` list for the response status `429` - added `#/components/schemas/BetaInvalidRequestError, #/components/schemas/BetaAuthenticationError, #/components/schemas/BetaBillingError, #/components/schemas/BetaPermissionError, #/components/schemas/BetaNotFoundError, #/components/schemas/BetaRateLimitError, #/components/schemas/BetaGatewayTimeoutError, #/components/schemas/BetaAPIError, #/components/schemas/BetaOverloadedError` to the `error` response property `oneOf` list for the response status `431` - added `#/components/schemas/BetaInvalidRequestError, #/components/schemas/BetaAuthenticationError, #/components/schemas/BetaBillingError, #/components/schemas/BetaPermissionError, #/components/schemas/BetaNotFoundError, #/components/schemas/BetaRateLimitError, #/components/schemas/BetaGatewayTimeoutError, #/components/schemas/BetaAPIError, #/components/schemas/BetaOverloadedError` to the `error` response property `oneOf` list for the response status `499` - added `#/components/schemas/BetaInvalidRequestError, #/components/schemas/BetaAuthenticationError, #/components/schemas/BetaBillingError, #/components/schemas/BetaPermissionError, #/components/schemas/BetaNotFoundError, #/components/schemas/BetaRateLimitError, #/components/schemas/BetaGatewayTimeoutError, #/components/schemas/BetaAPIError, #/components/schemas/BetaOverloadedError` to the `error` response property `oneOf` list for the response status `500` - added `#/components/schemas/BetaInvalidRequestError, #/components/schemas/BetaAuthenticationError, #/components/schemas/BetaBillingError, #/components/schemas/BetaPermissionError, #/components/schemas/BetaNotFoundError, #/components/schemas/BetaRateLimitError, #/components/schemas/BetaGatewayTimeoutError, #/components/schemas/BetaAPIError, #/components/schemas/BetaOverloadedError` to the `error` response property `oneOf` list for the response status `501` - added `#/components/schemas/BetaInvalidRequestError, #/components/schemas/BetaAuthenticationError, #/components/schemas/BetaBillingError, #/components/schemas/BetaPermissionError, #/components/schemas/BetaNotFoundError, #/components/schemas/BetaRateLimitError, #/components/schemas/BetaGatewayTimeoutError, #/components/schemas/BetaAPIError, #/components/schemas/BetaOverloadedError` to the `error` response property `oneOf` list for the response status `503` - added `#/components/schemas/BetaInvalidRequestError, #/components/schemas/BetaAuthenticationError, #/components/schemas/BetaBillingError, #/components/schemas/BetaPermissionError, #/components/schemas/BetaNotFoundError, #/components/schemas/BetaRateLimitError, #/components/schemas/BetaGatewayTimeoutError, #/components/schemas/BetaAPIError, #/components/schemas/BetaOverloadedError` to the `error` response property `oneOf` list for the response status `504` - the `error` response's property type changed from `object` to no type for status `400` - the `error` response's property type changed from `object` to no type for status `401` - the `error` response's property type changed from `object` to no type for status `403` - the `error` response's property type changed from `object` to no type for status `404` - the `error` response's property type changed from `object` to no type for status `408` - the `error` response's property type changed from `object` to no type for status `409` - the `error` response's property type changed from `object` to no type for status `412` - the `error` response's property type changed from `object` to no type for status `413` - the `error` response's property type changed from `object` to no type for status `429` - the `error` response's property type changed from `object` to no type for status `431` - the `error` response's property type changed from `object` to no type for status `499` - the `error` response's property type changed from `object` to no type for status `500` - the `error` response's property type changed from `object` to no type for status `501` - the `error` response's property type changed from `object` to no type for status `503` - the `error` response's property type changed from `object` to no type for status `504` - added `invalid_request_error, authentication_error, billing_error, permission_error, not_found_error, rate_limit_error, timeout_error, api_error, overloaded_error` discriminator mapping keys to the `error` response property for the response status `400` - added `invalid_request_error, authentication_error, billing_error, permission_error, not_found_error, rate_limit_error, timeout_error, api_error, overloaded_error` discriminator mapping keys to the `error` response property for the response status `401` - added `invalid_request_error, authentication_error, billing_error, permission_error, not_found_error, rate_limit_error, timeout_error, api_error, overloaded_error` discriminator mapping keys to the `error` response property for the response status `403` - added `invalid_request_error, authentication_error, billing_error, permission_error, not_found_error, rate_limit_error, timeout_error, api_error, overloaded_error` discriminator mapping keys to the `error` response property for the response status `404` - added `invalid_request_error, authentication_error, billing_error, permission_error, not_found_error, rate_limit_error, timeout_error, api_error, overloaded_error` discriminator mapping keys to the `error` response property for the response status `408` - added `invalid_request_error, authentication_error, billing_error, permission_error, not_found_error, rate_limit_error, timeout_error, api_error, overloaded_error` discriminator mapping keys to the `error` response property for the response status `409` - added `invalid_request_error, authentication_error, billing_error, permission_error, not_found_error, rate_limit_error, timeout_error, api_error, overloaded_error` discriminator mapping keys to the `error` response property for the response status `412` - added `invalid_request_error, authentication_error, billing_error, permission_error, not_found_error, rate_limit_error, timeout_error, api_error, overloaded_error` discriminator mapping keys to the `error` response property for the response status `413` - added `invalid_request_error, authentication_error, billing_error, permission_error, not_found_error, rate_limit_error, timeout_error, api_error, overloaded_error` discriminator mapping keys to the `error` response property for the response status `429` - added `invalid_request_error, authentication_error, billing_error, permission_error, not_found_error, rate_limit_error, timeout_error, api_error, overloaded_error` discriminator mapping keys to the `error` response property for the response status `431` - …5 more - **2026-08-18** `d3515f9e9eca` — 45 breaking, 60 info - added `#/components/schemas/BetaTargetStoreHeldError` to the `error` response property `oneOf` list for the response status `400` - added `#/components/schemas/BetaTargetStoreHeldError` to the `error` response property `oneOf` list for the response status `401` - added `#/components/schemas/BetaTargetStoreHeldError` to the `error` response property `oneOf` list for the response status `403` - added `#/components/schemas/BetaTargetStoreHeldError` to the `error` response property `oneOf` list for the response status `404` - added `#/components/schemas/BetaTargetStoreHeldError` to the `error` response property `oneOf` list for the response status `408` - added `#/components/schemas/BetaTargetStoreHeldError` to the `error` response property `oneOf` list for the response status `409` - added `#/components/schemas/BetaTargetStoreHeldError` to the `error` response property `oneOf` list for the response status `412` - added `#/components/schemas/BetaTargetStoreHeldError` to the `error` response property `oneOf` list for the response status `413` - added `#/components/schemas/BetaTargetStoreHeldError` to the `error` response property `oneOf` list for the response status `429` - added `#/components/schemas/BetaTargetStoreHeldError` to the `error` response property `oneOf` list for the response status `431` - added `#/components/schemas/BetaTargetStoreHeldError` to the `error` response property `oneOf` list for the response status `499` - added `#/components/schemas/BetaTargetStoreHeldError` to the `error` response property `oneOf` list for the response status `500` - added `#/components/schemas/BetaTargetStoreHeldError` to the `error` response property `oneOf` list for the response status `501` - added `#/components/schemas/BetaTargetStoreHeldError` to the `error` response property `oneOf` list for the response status `503` - added `#/components/schemas/BetaTargetStoreHeldError` to the `error` response property `oneOf` list for the response status `504` - the `error` response's property type changed from no type to `object` for status `400` - the `error` response's property type changed from no type to `object` for status `401` - the `error` response's property type changed from no type to `object` for status `403` - the `error` response's property type changed from no type to `object` for status `404` - the `error` response's property type changed from no type to `object` for status `408` - the `error` response's property type changed from no type to `object` for status `409` - the `error` response's property type changed from no type to `object` for status `412` - the `error` response's property type changed from no type to `object` for status `413` - the `error` response's property type changed from no type to `object` for status `429` - the `error` response's property type changed from no type to `object` for status `431` - the `error` response's property type changed from no type to `object` for status `499` - the `error` response's property type changed from no type to `object` for status `500` - the `error` response's property type changed from no type to `object` for status `501` - the `error` response's property type changed from no type to `object` for status `503` - the `error` response's property type changed from no type to `object` for status `504` - removed the required property `request_id` from the response with the `400` status - removed the required property `request_id` from the response with the `401` status - removed the required property `request_id` from the response with the `403` status - removed the required property `request_id` from the response with the `404` status - removed the required property `request_id` from the response with the `408` status - removed the required property `request_id` from the response with the `409` status - removed the required property `request_id` from the response with the `412` status - removed the required property `request_id` from the response with the `413` status - removed the required property `request_id` from the response with the `429` status - removed the required property `request_id` from the response with the `431` status - …65 more - **2026-08-17** `d2b230555b7f` — 9 breaking, 1 warning, 6 info - the request property `instructions` became not nullable - the request property `model/oneOf[#/components/schemas/BetaDreamModelConfigParams]/speed` became not nullable - response property `instructions` list-of-types was widened by adding types `null` to media type `application/json` of response `200` - response property `session_id` list-of-types was widened by adding types `null` to media type `application/json` of response `200` - the `archived_at` response's property type changed from `string` to no type, and format from `date-time` to no format for status `200` - the `ended_at` response's property type changed from `string` to no type, and format from `date-time` to no format for status `200` - the `error` response's property type changed from `object` to no type for status `200` - removed the required property `error/message` from the response with the `200` status - removed the required property `error/type` from the response with the `200` status - removed `#/components/schemas/BetaSpeed` from the `model/oneOf[#/components/schemas/BetaDreamModelConfigParams]/speed` request property `allOf` list - added `#/components/schemas/BetaSpeed, subschema #2` to the `model/oneOf[#/components/schemas/BetaDreamModelConfigParams]/speed` request property `anyOf` list - request property `instructions` list-of-types was widened by adding types `null` to media type `application/json` - the `instructions` request property's minLength was decreased from `1` to `0` - added `#/components/schemas/BetaDreamError, subschema #2` to the `error` response property `anyOf` list for the response status `200` - added `#/components/schemas/BetaTimestamp, subschema #2` to the `archived_at` response property `anyOf` list for the response status `200` - added `#/components/schemas/BetaTimestamp, subschema #2` to the `ended_at` response property `anyOf` list for the response status `200` - **2026-08-10** `44837c80aabe` — 2 info - added the new optional request property `output_behavior` - added the required property `output_behavior` to the response with the `200` status - **2026-07-10** `7bab1831a710` — 1 info - endpoint added --- [Operation](https://skmtc.dev/anthropics/apis/anthropic-api/docs/v1/dreams?beta=true/post.md) · [API](https://skmtc.dev/anthropics/apis/anthropic-api.md) · [Page](https://skmtc.dev/anthropics/apis/anthropic-api/changes/v1/dreams?beta=true/post)