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Releases

@openrouter/ai-sdk-provider@2.8.1

Patch Changes

• #487 4588197 Thanks @louisgv! - fix: preserve empty reasoning_details arrays in multi-turn conversations

  Some providers (notably DeepSeek V4 in thinking mode) return reasoning_details: []
  on turns where they produced no visible reasoning tokens. They require this empty array
  to be sent back in subsequent requests to maintain conversation state; omitting it
  causes 4xx errors on follow-up turns.

  src/chat/index.ts:

  • Stream finish event now always sets openrouterMetadata.reasoning_details, even when
    the accumulated array is empty (previously guarded by length > 0).
  • Both reasoning-end emit sites now always include providerMetadata.openrouter.reasoning_details,
    removing the length > 0 ternary that would drop the field entirely.

  src/chat/convert-to-openrouter-chat-messages.ts:

  • candidateReasoningDetails selection now uses Array.isArray(messageReasoningDetails)
    instead of messageReasoningDetails.length > 0 — an explicit [] is now treated as
    "metadata was provided" rather than "metadata was absent", and no longer falls through
    to findFirstReasoningDetails.
  • The top-level if (candidateReasoningDetails) guard no longer requires length > 0;
    an empty candidate array still triggers the dedup/signature-filter block.
  • finalReasoningDetails is now always set to uniqueDetails (the deduplicated array),
    never collapsed to undefined. When all entries were duplicate or signature-stripped,
    the empty array is preserved as a meaningful signal.
  • effectiveReasoning still requires finalReasoningDetails.length > 0 — reasoning
    text is never sent alongside an empty details array.