ModelBehaviorError: Invalid output type when using @openrouter/ai-sdk-provider with outputType

[rajnandan1]

Describe the bug

ModelBehaviorError: Invalid output type when using openrouter with aisdk and outputType

ModelBehaviorError: Invalid output type
    at executeToolsAndSideEffects (/Users/rajnandan1/Code/node_modules/@openai/agents-core/src/runImplementation.ts:614:13)
    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)
    at async <anonymous> (/Users/rajnandan1/Code/node_modules/@openai/agents-core/src/run.ts:408:32)
    at async <anonymous> (/Users/rajnandan1/Code/node_modules/@openai/agents-core/src/tracing/context.ts:60:20)
    at async <anonymous> (/Users/rajnandan1/Code/aisdk.ts:29:17) {
  state: undefined
}

Debug information

• Agents SDK version: (e.g. v0.0.13)
• Runtime environment (e.g. Node.js v24.1.0)
• "zod": "^3.25.67",
• "@openrouter/ai-sdk-provider": "^0.7.3",
• "@ai-sdk/openai": "^1.3.23",
• "@openai/agents-extensions": "^0.0.13",

Repro steps

import { Agent } from '@openai/agents';
import { aisdk } from '@openai/agents-extensions';
import { createOpenRouter } from '@openrouter/ai-sdk-provider';
import { Runner } from '@openai/agents';
import { z } from 'zod';
import dotenv from 'dotenv';
dotenv.config();
const StartAgentResponseSchema2 = z.object({
	content: z.string().describe('Markdown formatted content ')
});

const modelName = 'anthropic/claude-sonnet-4';
const openrouter = createOpenRouter({
	apiKey: process.env.OPEN_ROUTER_KEY || ''
});
const model = aisdk(openrouter(modelName));

const runner = new Runner({
	model: model,
	tracingDisabled: true
});
const agent = new Agent({
	name: 'Assistant',
	instructions: 'You are a helpful assistant',
	outputType: StartAgentResponseSchema2
});

try {
	const result = await runner.run(agent, 'Write a haiku about  programming.');
	console.log(result.finalOutput);
} catch (e) {
	console.log(e);
}

Expected behavior

{
  'content': 'Function calls itself  \nEndless echoes in the code  \nI see me again'
}

[rajnandan1]

@seratch when will this be released.

[rajnandan1]

Working in 0.0.15

[rajnandan1]

It is still happening, behaviour is that it sometimes works and sometimes it gives the same error

"@openai/agents": "^0.0.15",
"@openai/agents-extensions": "^0.0.15",