Basic Usage

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const response = await fetch('https://openrouter.ai/api/v1/responses', {
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  method: 'POST',
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  headers: {
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    'Authorization': 'Bearer YOUR_OPENROUTER_API_KEY',
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    'Content-Type': 'application/json',
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  },
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  body: JSON.stringify({
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    model: 'openai/o4-mini',
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    input: 'What is the meaning of life?',
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    max_output_tokens: 9000,
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  }),
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});
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const result = await response.json();
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console.log(result);

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const response = await fetch('https://openrouter.ai/api/v1/responses', {
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  method: 'POST',
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  headers: {
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    'Authorization': 'Bearer YOUR_OPENROUTER_API_KEY',
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    'Content-Type': 'application/json',
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  },
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  body: JSON.stringify({
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    model: 'openai/o4-mini',
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    input: [
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      {
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        type: 'message',
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        role: 'user',
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        content: [
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          {
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            type: 'input_text',
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            text: 'Tell me a joke about programming',
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          },
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        ],
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      },
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    ],
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    max_output_tokens: 9000,
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  }),
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});
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const result = await response.json();

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const response = await fetch('https://openrouter.ai/api/v1/responses', {
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  method: 'POST',
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  headers: {
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    'Authorization': 'Bearer YOUR_OPENROUTER_API_KEY',
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    'Content-Type': 'application/json',
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  },
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  body: JSON.stringify({
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    model: 'openai/o4-mini',
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    input: 'Write a short story about AI',
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    stream: true,
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    max_output_tokens: 9000,
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  }),
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});
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const reader = response.body?.getReader();
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const decoder = new TextDecoder();
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while (true) {
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  const { done, value } = await reader.read();
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  if (done) break;
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  const chunk = decoder.decode(value);
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  const lines = chunk.split('\n');
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  for (const line of lines) {
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    if (line.startsWith('data: ')) {
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      const data = line.slice(6);
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      if (data === '[DONE]') return;
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      try {
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        const parsed = JSON.parse(data);
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        console.log(parsed);
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      } catch (e) {
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        // Skip invalid JSON
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      }
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    }
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  }
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}

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try {
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  const response = await fetch('https://openrouter.ai/api/v1/responses', {
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    method: 'POST',
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    headers: {
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      'Authorization': 'Bearer YOUR_OPENROUTER_API_KEY',
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      'Content-Type': 'application/json',
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    },
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    body: JSON.stringify({
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      model: 'openai/o4-mini',
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      input: 'Hello, world!',
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    }),
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  });
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  if (!response.ok) {
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    const error = await response.json();
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    console.error('API Error:', error.error.message);
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    return;
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  }
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  const result = await response.json();
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  console.log(result);
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} catch (error) {
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  console.error('Network Error:', error);
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}

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// First request
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const firstResponse = await fetch('https://openrouter.ai/api/v1/responses', {
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  method: 'POST',
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  headers: {
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    'Authorization': 'Bearer YOUR_OPENROUTER_API_KEY',
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    'Content-Type': 'application/json',
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  },
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  body: JSON.stringify({
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    model: 'openai/o4-mini',
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    input: [
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      {
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        type: 'message',
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        role: 'user',
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        content: [
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          {
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            type: 'input_text',
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            text: 'What is the capital of France?',
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          },
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        ],
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      },
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    ],
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    max_output_tokens: 9000,
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  }),
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});
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const firstResult = await firstResponse.json();
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// Second request - include previous conversation
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const secondResponse = await fetch('https://openrouter.ai/api/v1/responses', {
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  method: 'POST',
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  headers: {
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    'Authorization': 'Bearer YOUR_OPENROUTER_API_KEY',
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    'Content-Type': 'application/json',
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  },
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  body: JSON.stringify({
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    model: 'openai/o4-mini',
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    input: [
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      {
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        type: 'message',
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        role: 'user',
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        content: [
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          {
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            type: 'input_text',
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            text: 'What is the capital of France?',
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          },
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        ],
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      },
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      {
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        type: 'message',
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        role: 'assistant',
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        id: 'msg_abc123',
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        status: 'completed',
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        content: [
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          {
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            type: 'output_text',
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            text: 'The capital of France is Paris.',
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            annotations: []
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          }
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        ]
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      },
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      {
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        type: 'message',
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        role: 'user',
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        content: [
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          {
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            type: 'input_text',
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            text: 'What is the population of that city?',
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          },
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        ],
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      },
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    ],
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    max_output_tokens: 9000,
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  }),
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});
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const secondResult = await secondResponse.json();