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fix(openai): send content: null instead of empty string for tool-call-only assistant messages #12605

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fix(openai): send content: null instead of empty string for tool-call-only assistant messages #12605

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fix(openai): send content: null instead of "" for tool-call-only assi…
giulio-leone Feb 14, 2026
373edf3
add changeset for #12389
giulio-leone Feb 14, 2026
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5 changes: 5 additions & 0 deletions .changeset/fix-content-empty-string-null.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
---
'@ai-sdk/openai': patch
---

fix(openai): send content: null instead of empty string for tool-call-only assistant messages. This fixes issues with OpenAI-compatible providers that behave differently with content: "" vs content: null.
2 changes: 1 addition & 1 deletion packages/openai/src/chat/convert-to-openai-chat-messages.test.ts
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Expand Up @@ -455,7 +455,7 @@ describe('tool calls', () => {
expect(result.messages).toEqual([
{
role: 'assistant',
content: '',
content: null,
tool_calls: [
{
type: 'function',
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2 changes: 1 addition & 1 deletion packages/openai/src/chat/convert-to-openai-chat-messages.ts
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Expand Up @@ -175,7 +175,7 @@ export function convertToOpenAIChatMessages({

messages.push({
role: 'assistant',
content: text,
content: text || null,
tool_calls: toolCalls.length > 0 ? toolCalls : undefined,
});

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