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Major Changes

  • e1cbf8a: chore(@ai-sdk/rsc): extract to separate package

  • a847c3e: chore: rename reasoning to reasoningText etc

  • 13fef90: chore (ai): remove automatic conversion of UI messages to model messages

  • d964901: - remove setting temperature to 0 by default

    • remove null option from DefaultSettingsMiddleware
    • remove setting defaults for temperature and stopSequences in ai to enable middleware changes

  • 0a710d8: feat (ui): typed tool parts in ui messages

  • 9ad0484: feat (ai): automatic tool execution error handling

  • 63f9e9b: chore (provider,ai): tools have input/output instead of args,result

  • ab7ccef: chore (ai): change source ui message parts to source-url

  • d5f588f: AI SDK 5

  • ec78cdc: chore (ai): remove "data" UIMessage role

  • 6a83f7d: refactoring (ai): restructure message metadata transfer

  • db345da: chore (ai): remove exports of internal ui functions

  • 496bbc1: chore (ui): inline/remove ChatRequest type

  • 72d7d72: chore (ai): stable activeTools

  • 40acf9b: feat (ui): introduce ChatStore and ChatTransport

  • 98f25e5: chore (ui): remove managed chat inputs

  • 2d03e19: chore (ai): remove StreamCallbacks.onCompletion

  • da70d79: chore (ai): remove getUIText helper

  • c60f895: chore (ai): remove useChat keepLastMessageOnError

  • 0560977: chore (ai): improve consistency of generate text result, stream text result, and step result

  • 9477ebb: chore (ui): remove useAssistant hook (breaking change)

  • 1f55c21: chore (ai): send reasoning to the client by default

  • e7dc6c7: chore (ai): remove onResponse callback

  • 8b86e99: chore (ai): replace Message with UIMessage

  • 04d5063: chore (ai): rename default provider global to AI_SDK_DEFAULT_PROVIDER

  • 319b989: chore (ai): remove content from ui messages

  • 14c9410: chore: refactor file towards source pattern (spec)

  • a34eb39: chore (ai): remove data and allowEmptySubmit from ChatRequestOptions

  • f04fb4a: chore (ai): replace useChat attachments with file ui parts

  • f7e8bf4: chore (ai): flatten ui message stream parts

  • 257224b: chore (ai): separate TextStreamChatTransport

  • fd1924b: chore (ai): remove redundant mimeType property

  • 2524fc7: chore (ai): remove ui message toolInvocations property

  • 6fba4c7: chore (ai): remove deprecated experimental_providerMetadata

  • b4b4bb2: chore (ui): rename experimental_resume to resumeStream

  • 441d042: chore (ui): data stream protocol v2 with SSEs

  • ef256ed: chore (ai): refactor and use chatstore in svelte

  • 516be5b: ### Move Image Model Settings into generate options

    Image Models no longer have settings. Instead, maxImagesPerCall can be passed directly to generateImage(). All other image settings can be passed to providerOptions[provider].

    Before

    js await generateImage({ model: luma.image('photon-flash-1', { maxImagesPerCall: 5, pollIntervalMillis: 500, }), prompt, n: 10, });

    After

    js await generateImage({ model: luma.image('photon-flash-1'), prompt, n: 10, maxImagesPerCall: 5, providerOptions: { luma: { pollIntervalMillis: 5 }, }, });

    Pull Request: https://github.com/vercel/ai/pull/6180

  • a662dea: chore (ai): remove sendExtraMessageFields

  • d884051: feat (ai): simplify default provider setup

  • e8324c5: feat (ai): add args callbacks to tools

  • fafc3f2: chore (ai): change file to parts to use urls instead of data

  • 1ed0287: chore (ai): stable sendStart/sendFinish options

  • c7710a9: chore (ai): rename DataStreamToSSETransformStream to JsonToSseTransformStream

  • bfbfc4c: feat (ai): streamText/generateText: totalUsage contains usage for all steps. usage is for a single step.

  • 9ae327d: chore (ui): replace chat store concept with chat instances

  • 9315076: chore (ai): rename continueUntil to stopWhen. Rename maxSteps stop condition to stepCountIs.

  • 247ee0c: chore (ai): remove steps from tool invocation ui parts

  • 109c0ac: chore (ai): rename id to chatId (in post request, resume request, and useChat)

  • 954aa73: feat (ui): extended regenerate support

  • 33eb499: feat (ai): inject message id in createUIMessageStream

  • 901df02: feat (ui): use UI_MESSAGE generic

  • 4892798: chore (ai): always stream tool calls

  • c25cbce: feat (ai): use console.error as default error handler for streamText and streamObject

  • b33ed7a: chore (ai): rename DataStream_ to UIMessage_

  • ed675de: feat (ai): add ui data parts

  • 7bb58d4: chore (ai): restructure prepareRequest

  • ea7a7c9: feat (ui): UI message metadata

  • 0463011: fix (ai): update source url stream part

  • dcc549b: remove StreamTextResult.mergeIntoDataStream method rename DataStreamOptions.getErrorMessage to onError add pipeTextStreamToResponse function add createTextStreamResponse function change createDataStreamResponse function to accept a DataStream and not a DataStreamWriter change pipeDataStreamToResponse function to accept a DataStream and not a DataStreamWriter change pipeDataStreamToResponse function to have a single parameter

  • 35fc02c: chore (ui): rename RequestOptions to CompletionRequestOptions

  • 64f6d64: feat (ai): replace maxSteps with continueUntil (generateText)

  • 175b868: chore (ai): rename reasoning UI parts 'reasoning' property to 'text'

  • 60e2c56: feat (ai): restructure chat transports

  • 765f1cd: chore (ai): remove deprecated useChat isLoading helper

  • cb2b53a: chore (ai): refactor header preparation

  • e244a78: chore (ai): remove StreamData and mergeStreams

  • d306260: feat (ai): replace maxSteps with continueUntil (streamText)

  • 4bfe9ec: chore (ai): remove ui message reasoning property

  • 1766ede: chore: rename maxTokens to maxOutputTokens

  • 2877a74: chore (ai): remove ui message data property

  • 1409e13: chore (ai): remove experimental continueSteps

  • b32e192: chore (ai): rename reasoning to reasoningText, rename reasoningDetails to reasoning (streamText, generateText)

  • 92cb0a2: chore (ai): rename CoreMessage to ModelMessage

  • 2b637d6: chore (ai): rename UIMessageStreamPart to UIMessageChunk

Minor Changes

  • b7eae2d: feat (core): Add finishReason field to NoObjectGeneratedError
  • bcea599: feat (ai): add content to generateText result
  • 48d675a: feat (ai): add content to streamText result
  • c9ad635: feat (ai): add filename to file ui parts

Patch Changes

  • a571d6e: chore(provider-utils): move ToolResultContent to provider-utils

  • de2d2ab: feat(ai): add provider and provider registry middleware functionality

  • c22ad54: feat(smooth-stream): chunking callbacks

  • d88455d: feat (ai): expose http chat transport type

  • e7fcc86: feat (ai): introduce dynamic tools

  • da1e6f0: feat (ui): add generics to ui message stream parts

  • 48378b9: fix (ai): send null as tool output when tools return undefined

  • 5d1e3ba: chore (ai): remove provider re-exports

  • 93d53a1: chore (ai): remove cli

  • e90d45d: chore (rsc): move HANGING_STREAM_WARNING_TIME constant into @ai-sdk/rsc package

  • b32c141: feat (ai): add array support to stopWhen

  • bc3109f: chore (ai): push stream-callbacks into langchain/llamaindex adapters

  • 0d9583c: fix (ai): use user-provided media type when available

  • 38ae5cc: feat (ai): export InferUIMessageChunk type

  • 10b21eb: feat(cli): add ai command line interface

  • 9e40cbe: Allow destructuring output and errorText on ToolUIPart type

  • 6909543: feat (ai): support system parameter in Agent constructor

  • 86cfc72: feat (ai): add ignoreIncompleteToolCalls option to convertToModelMessages

  • 377bbcf: fix (ui): tool input can be undefined during input-streaming

  • d8aeaef: feat(providers/fal): add transcribe

  • ae77a99: chore (ai): rename text and reasoning chunks in streamText fullstream

  • 4fef487: feat: support for zod v4 for schema validation

    All these methods now accept both a zod v4 and zod v3 schemas for validation:

    • generateObject()
    • streamObject()
    • generateText()
    • experimental_useObject() from @ai-sdk/react
    • streamUI() from @ai-sdk/rsc

  • b1e3abd: feat (ai): expose ui message stream headers

  • 4f3e637: fix (ui): avoid caching globalThis.fetch in case it is patched by other libraries

  • 14cb3be: chore(providers/llamaindex): extract to separate package

  • 1f6ce57: feat (ai): infer tool call types in the onToolCall callback

  • 16ccfb2: feat (ai): add readUIMessageStream helper

  • 225f087: fix (ai/mcp): prevent mutation of customEnv

  • ce1d1f3: feat (ai): export mock image, speech, and transcription models

  • fc0380b: feat (ui): resolvable header, body, credentials in http chat transport

  • 6622441: feat (ai): add static/dynamic toolCalls/toolResults helpers

  • 4048ce3: fix (ai): add tests and examples for openai responses

  • 6c42e56: feat (ai): validate ui stream data chunks

  • bedb239: chore (ai): make ui stream parts value optional when it's not required

  • 9b4d074: feat(streamObject): add enum support

  • c8fce91: feat (ai): add experimental Agent abstraction

  • 655cf3c: feat (ui): add onFinish to createUIMessageStream

  • 3e10408: fix(utils/detect-mimetype): add support for detecting id3 tags

  • d5ae088: feat (ui): add sendAutomaticallyWhen to Chat

  • ced8eee: feat(ai): re-export zodSchema from main package

  • c040e2f: fix (ui): inject generated response message id

  • d3960e3: selectTelemetryAttributes more robustness

  • faea29f: fix (provider/openai): multi-step reasoning with text

  • 66af894: fix (ai): respect content order in toResponseMessages

  • 332167b: chore (ai): move maxSteps into UseChatOptions

  • 6b1c55c: feat (ai): introduce GLOBAL_DEFAULT_PROVIDER

  • 5a975a4: feat (ui): update Chat tool result submission

  • 507ac1d: fix (ui/react): update messages immediately with the submitted user message

  • a166433: feat: add transcription with experimental_transcribe

  • 26735b5: chore(embedding-model): add v2 interface

  • c93a8bc: chore(ai): export AsyncIterableStream type from async-iterable-stream module

  • 0d2c085: feat (ai): support string model ids through gateway

  • 2b9bbcd: feat (ai): improve prompt validation error message

  • a8c8bd5: feat(embed-many): respect supportsParallelCalls & concurrency

  • 75c3396: fix (ai): handle errors in 2nd streamText doStream call

  • cb9c9e4: remove deprecated experimental_wrapLanguageModel

  • 9bf7291: chore(providers/openai): enable structuredOutputs by default & switch to provider option

  • 9b0da33: fix (ai): do not send id with start unless specified

  • 28ad69e: fix(react-native): support experimental_attachments without FileList global

  • 0b78e17: chore(ai/generateObject): simplify function signature

  • 20398f2: feat: ai sdk cli documentation + adjusted default model

  • 66962ed: fix(packages): export node10 compatible types

  • b71fe8d: fix(ai): remove jsondiffpatch dependency

  • 7827a49: fix (ai/core): refactor toResponseMessages to filter out empty string/content

  • bd8a36c: feat(embedding-model-v2/embedMany): add response body field

  • d9209ca: fix (image-model): specificationVersion: v1 -> v2

  • b346545: feat (ai): add data ui part schemas

  • 05d2819: feat: allow zod 4.x as peer dependency

  • f2b041e: Fix custom fetch in HttpChatTransport

  • 2a62513: Fix error thrown when emptying messages in onError or onFinish

  • 143c55b: feat (ai): export Chat callback types

  • 9301f86: refactor (image-model): rename ImageModelV1 to ImageModelV2

  • 904fa5e: feat (ai/core): add terminateOnError option to readUIMessageStream

  • 0a87932: core (ai): change transcription model mimeType to mediaType

  • 1675396: fix: avoid job executor deadlock when adding tool result

  • 51f497d: feat (ai): step input message modification in prepareStep

  • cee64b2: fix(otel): change back toolCall attributes of input/output back to args/result for compatibility

  • f04ffe4: feat (ui): add onData callback to Chat

  • bc24722: feat (ai): Add finishReason as a promise on StreamObjectResult to match StreamTextResult

  • b6f9f3c: remove deprecated CoreTool* types

  • 8aa9e20: feat: add speech with experimental_generateSpeech

  • 4617fab: chore(embedding-models): remove remaining settings

  • 8255639: ### Fix use with Google APIs + zod v4's .literal() schema

    Before zod@3.25.49, requests to Google's APIs failed due to a missing type in the provided schema. The problem has been resolved for the ai SDK by bumping our zod peer dependencies to ^3.25.49.

    pull request: https://github.com/vercel/ai/pull/6609

  • f81c720: chore(ai): bundle dependencies in CLI binary

  • cf9af6e: feat (ai): allow sync prepareStep

  • ee38081: Add support for audio/webm to detect-media-type

  • 2e4f9e4: feat (ai): improved error messages when using gateway

  • 3e3b9df: fix (ai/mcp): better support for zero-argument MCP tools

  • cda32ba: fix (ai): send start part in correct position in stream (streamText)

  • 48a7606: feat (ai): support changing the system prompt in prepareSteps

  • cb68df0: feat: add transcription and speech model support to provider registry

  • db64cbe: fix (provider/openai): multi-step reasoning with tool calls

  • 97c35c0: feat (ui): transient data parts

  • 26695a3: feat (ui): add state for text and reasoning ui message parts

  • 90ac328: fix (ui): tool part metadata support in ui messages

  • 60132dd: fixed date formatting for updated mcp protocol version

  • 4a1e0c8: fix(ai-cli): fix bundling and improve authentication error handling

  • c6b64a7: feat (ai): allow async prepareRequest on HttpChatTransport

  • fccf75c: update mcp protocol version

  • 9121250: Expose provider metadata as an attribute on exported OTEL spans

  • ea27cc6: chore (ai): use JSONValue definition from provider

  • 90ca2b9: feat(ai): Record tool call errors on tool call spans recorded in generateText and streamText.

  • 50f0362: fix (ai): fix experimental sendStart/sendFinish options in streamText

  • 825e8d7: release alpha.5

  • 7d97ab6: release alpha.4

  • 0ff02bb: chore(provider-utils): move over jsonSchema

  • 4f3776c: feat (ai): add InferUITools helper

  • 9338f3e: fix (ai): throw error for v1 models

  • 92c8e66: fix(ai/core): properly handle custom separator in provider registry

  • 53569b8: feat (ai): add experimental repairText function to streamObject

  • 82aa95d: fix (ai): merge data ui stream parts correctly

  • e7d2ce3: feat: provider-executed tools

  • add5ac1: feat (ai): make streamText toUIMessageStream async iterable

  • 37a916d: feat (ai): add prepareSteps to streamText

  • 30ac566: fix (ui): text message metadata support in ui messages

  • 8026705: fix (core): send buffered text in smooth stream when stream parts change

  • 9bd5ab5: feat (provider): add providerMetadata to ImageModelV2 interface (#5977)

    The experimental_generateImage method from the ai package now returnes revised prompts for OpenAI's image models.

    ```js const prompt = 'Santa Claus driving a Cadillac';

    const { providerMetadata } = await experimental_generateImage({ model: openai.image('dall-e-3'), prompt, });

    const revisedPrompt = providerMetadata.openai.images[0]?.revisedPrompt;

    console.log({ prompt, revisedPrompt, }); ```

  • ec5933d: chore (ai/mcp): add assertCapability method to experimental MCP client

  • 09f41ac: fix (ui): add message metadata in Chat.sendMessage

  • ff1c81a: feat (ai): add streamText onAbort callback

  • af1d5a5: fix(ai): Unexpected reasoning-start event in extract reasoning middleware

  • cb3b9c9: fix (ai): catch errors in ui message stream

  • 86293e5: fix (ai): use correct generateMessageId in streamText toUIMessageStream

  • d1a034f: feature: using Zod 4 for internal stuff

  • fd65bc6: chore(embedding-model-v2): rename rawResponse to response

  • d92b9a8: fix(ai): add support for MCP protocol version 2025-06-18

  • 102b066: fix (ai): fix invalid fetch call

  • 142576e: feat (ui): support message replacement in chat via messageId param on sendMessage

  • 84343eb: fix (ui): call sendAutomaticallyWhen with updated messages

  • a76a62b: feat (ai): add experimental prepareStep callback to generateText

  • 89ba235: fix (ui): support tool names with dash

  • 8e31d46: feat (ai): export SourceDocumentUIPart

  • bd398e4: fix (core): improve error handling in streamText's consumeStream method

  • 88a8ee5: fix (ai): support abort during retry waits

  • 205077b: fix: improve Zod compatibility

  • d91b50d: chore(ui-utils): merge into ai package

  • e4c8647: feat (ui): allow asynchronous onFinish in createUIMessageStream

  • c808e4d: fix (ui): do not send changing assistant message ids when onFinish is provided

  • e862b5b: feat (ai): allow sync tool.execute

  • 395c85e: feat (ai): add consumeSseStream option to UI message stream responses

  • 5bdff05: Removed deprecated options.throwErrorForEmptyVectors from cosineSimilarity(). Since throwErrorForEmptyVectors was the only option the entire options argument was removed.

    diff - cosineSimilarity(vector1, vector2, options) +cosineSimilarity(vector1, vector2)

  • 13b4f46: feat (ai): export experimental MCPClient and MCPClientConfig interfaces

  • a4f3007: chore: remove ai/react

  • 8e64e9c: feat (ai): allow using provider default temperature by specifying null

  • b983b51: feat (ai): support model message array in prompt

  • 56c232b: fix (ai): remove outdated sendStart jsdoc

  • 7324c21: fix (ai/telemetry): Avoid JSON.stringify on Uint8Arrays for telemetry

  • f10304b: feat(tool-calling): don't require the user to have to pass parameters

  • dd5fd43: feat (ai): support dynamic tools in Chat onToolCall

  • a753b3a: feat (provider/anthropic): cache control for tools

  • 383cbfa: feat (ai): add isAborted to onFinish callback for ui message streams

  • 27deb4d: feat (provider/gateway): Add providerMetadata to embeddings response

  • 5f2b3d4: chore (ai): stable prepareStep

  • 4c8f834: feat: automatically respect rate limit headers in retry logic

    Added automatic support for respecting rate limit headers (retry-after-ms and retry-after) in the SDK's retry logic. When these headers are present and contain reasonable values (0-60 seconds), the retry mechanism will use the server-specified delay instead of exponential backoff. This matches the behavior of Anthropic and OpenAI client SDKs and improves rate limit handling without requiring any API changes.

  • f2c7f19: feat (ui): add Chat.clearError()

  • 7bd025b: fix (ai): fix sync tool execute with streamText

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    • @ai-sdk/provider-utils@3.0.0
    • @ai-sdk/provider@2.0.0
    • @ai-sdk/gateway@1.0.0
Source: README.md, updated 2025-07-31