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fix(ai-openai): deduplicate response.output items to prevent invalid JSON concatenation #6178

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IMax153 merged 2 commits into from
Apr 17, 2026
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fix(ai-openai): deduplicate response.output items to prevent invalid JSON concatenation #6178

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cd51106
fix(ai-openai): deduplicate response.output items to prevent invalid …
aayushbaluni Apr 15, 2026
ea6159c
chore: add changeset for @effect/ai-openai patch
aayushbaluni Apr 15, 2026
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5 changes: 5 additions & 0 deletions .changeset/fix-deduplicate-openai-output.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
---
"@effect/ai-openai": patch
---

fix(ai-openai): deduplicate response.output items to prevent invalid JSON concatenation
9 changes: 9 additions & 0 deletions packages/ai/openai/src/OpenAiLanguageModel.ts
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Expand Up @@ -567,7 +567,16 @@ const makeResponse: (
timestamp: DateTime.formatIso(DateTime.unsafeFromDate(createdAt))
})

// Deduplicate output items by ID to handle OpenAI Responses API bug
// where duplicate OutputMessage items appear in response.output
const seenOutputIds = new Set<string>()
for (const part of response.output) {
if (part.id && seenOutputIds.has(part.id)) {
continue
}
if (part.id) {
seenOutputIds.add(part.id)
}
switch (part.type) {
case "message": {
for (const contentPart of part.content) {
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