Create a chat completion

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    model: 'openai/gpt-5-nano',
    stream: false,
    messages: [{role: 'user', content: 'What is the current datetime in Europe/London?'}],
    tools: [{type: 'gateway:datetime', parameters: {timezone: 'Europe/London'}}],
    tool_choice: 'auto'
  })
};

fetch('https://api.phaseo.app/v1/chat/completions', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://api.phaseo.app/v1/chat/completions"

payload = {
    "model": "openai/gpt-5-nano",
    "stream": False,
    "messages": [
        {
            "role": "user",
            "content": "What is the current datetime in Europe/London?"
        }
    ],
    "tools": [
        {
            "type": "gateway:datetime",
            "parameters": { "timezone": "Europe/London" }
        }
    ],
    "tool_choice": "auto"
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

curl --request POST \
  --url https://api.phaseo.app/v1/chat/completions \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "model": "openai/gpt-5-nano",
  "stream": false,
  "messages": [
    {
      "role": "user",
      "content": "What is the current datetime in Europe/London?"
    }
  ],
  "tools": [
    {
      "type": "gateway:datetime",
      "parameters": {
        "timezone": "Europe/London"
      }
    }
  ],
  "tool_choice": "auto"
}
'

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.phaseo.app/v1/chat/completions"

	payload := strings.NewReader("{\n  \"model\": \"openai/gpt-5-nano\",\n  \"stream\": false,\n  \"messages\": [\n    {\n      \"role\": \"user\",\n      \"content\": \"What is the current datetime in Europe/London?\"\n    }\n  ],\n  \"tools\": [\n    {\n      \"type\": \"gateway:datetime\",\n      \"parameters\": {\n        \"timezone\": \"Europe/London\"\n      }\n    }\n  ],\n  \"tool_choice\": \"auto\"\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Authorization", "Bearer <token>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://api.phaseo.app/v1/chat/completions")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"model\": \"openai/gpt-5-nano\",\n  \"stream\": false,\n  \"messages\": [\n    {\n      \"role\": \"user\",\n      \"content\": \"What is the current datetime in Europe/London?\"\n    }\n  ],\n  \"tools\": [\n    {\n      \"type\": \"gateway:datetime\",\n      \"parameters\": {\n        \"timezone\": \"Europe/London\"\n      }\n    }\n  ],\n  \"tool_choice\": \"auto\"\n}")
  .asString();

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.phaseo.app/v1/chat/completions",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'model' => 'openai/gpt-5-nano',
    'stream' => false,
    'messages' => [
        [
                'role' => 'user',
                'content' => 'What is the current datetime in Europe/London?'
        ]
    ],
    'tools' => [
        [
                'type' => 'gateway:datetime',
                'parameters' => [
                                'timezone' => 'Europe/London'
                ]
        ]
    ],
    'tool_choice' => 'auto'
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

require 'uri'
require 'net/http'

url = URI("https://api.phaseo.app/v1/chat/completions")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"model\": \"openai/gpt-5-nano\",\n  \"stream\": false,\n  \"messages\": [\n    {\n      \"role\": \"user\",\n      \"content\": \"What is the current datetime in Europe/London?\"\n    }\n  ],\n  \"tools\": [\n    {\n      \"type\": \"gateway:datetime\",\n      \"parameters\": {\n        \"timezone\": \"Europe/London\"\n      }\n    }\n  ],\n  \"tool_choice\": \"auto\"\n}"

response = http.request(request)
puts response.read_body

{
  "id": "<string>",
  "nativeResponseId": "<string>",
  "object": "<string>",
  "created": 123,
  "model": "<string>",
  "provider": "<string>",
  "choices": [
    {
      "index": 123,
      "message": {
        "role": "system",
        "content": "<string>",
        "name": "<string>",
        "tool_calls": [
          {
            "id": "<string>",
            "type": "function",
            "function": {
              "name": "<string>",
              "arguments": "<string>",
              "description": "<string>",
              "parameters": {}
            }
          }
        ],
        "images": [
          {
            "type": "image_url",
            "image_url": {
              "url": "<string>"
            },
            "mime_type": "<string>"
          }
        ],
        "audios": [
          {
            "type": "audio_url",
            "audio_url": {
              "url": "<string>"
            },
            "mime_type": "<string>",
            "format": "wav"
          }
        ],
        "audio": {
          "id": "<string>",
          "data": "<string>",
          "expires_at": 123,
          "transcript": "<string>"
        },
        "tool_call_id": "<string>",
        "reasoning_content": "<string>",
        "reasoning": "<string>",
        "reasoning_details": [
          {
            "type": "reasoning.text",
            "id": "<string>",
            "index": 123,
            "format": "<string>",
            "text": "<string>",
            "summary": "<string>",
            "signature": "<string>",
            "data": "<string>"
          }
        ]
      },
      "finish_reason": "stop"
    }
  ],
  "usage": {
    "prompt_tokens": 123,
    "prompt_tokens_details": {
      "cached_tokens": 123,
      "cache_write_tokens": 123,
      "cache_write_tokens_details": {
        "ttl_30m_tokens": 123,
        "ttl_12h_tokens": 123
      }
    },
    "completion_tokens": 123,
    "input_tokens": 123,
    "input_tokens_details": {
      "cached_tokens": 123,
      "cache_write_tokens": 123,
      "cache_write_tokens_details": {
        "ttl_30m_tokens": 123,
        "ttl_12h_tokens": 123
      }
    },
    "output_tokens": 123,
    "total_tokens": 123,
    "server_tool_use": {
      "datetime_requests": 1,
      "web_search_requests": 1,
      "subagent_requests": 1,
      "fusion_requests": 1,
      "search_models_requests": 1,
      "web_fetch_requests": 1,
      "advisor_requests": 1,
      "image_generation_requests": 1,
      "apply_patch_requests": 1
    },
    "cost": 0.001234567,
    "cost_details": {
      "upstream_inference_cost": null
    }
  }
}

{
  "error": {
    "code": "validation_error",
    "message": "Unknown parameter: foo",
    "type": "invalid_request_error",
    "param": "foo"
  },
  "ok": false,
  "code": "validation_error",
  "message": "Human-readable error message",
  "description": "Additional error details.",
  "generation_id": "G-abc123",
  "status_code": 502,
  "error_type": "system",
  "error_origin": "upstream",
  "reason": "all_candidates_failed",
  "attempt_count": 2,
  "failed_providers": [
    "google-ai-studio",
    "openai"
  ],
  "failed_statuses": [
    403,
    429
  ],
  "upstream_error": {
    "code": "PERMISSION_DENIED",
    "message": "The caller does not have permission.",
    "description": "<string>",
    "param": "<string>"
  },
  "failure_sample": [
    {
      "provider": "<string>",
      "type": "<string>",
      "status": 123,
      "upstream_error_code": "<string>",
      "upstream_error_message": "<string>",
      "upstream_error_description": "<string>",
      "upstream_error_param": "<string>",
      "upstream_payload_preview": "<string>",
      "retryable": true
    }
  ],
  "provider_failure_diagnostics": {
    "category": "credentials_not_configured",
    "hint": "<string>",
    "provider": "<string>"
  },
  "routing_diagnostics": {
    "filterStages": [
      {
        "stage": "<string>",
        "beforeCount": 123,
        "afterCount": 123,
        "droppedProviders": [
          {
            "providerId": "<string>",
            "reason": "<string>"
          }
        ]
      }
    ]
  },
  "provider_candidate_diagnostics": {
    "totalProviders": 123,
    "supportsEndpointCount": 123,
    "candidateCount": 123,
    "droppedUnsupportedEndpoint": [
      "<string>"
    ],
    "droppedMissingAdapter": [
      {
        "providerId": "<string>",
        "endpoint": "<string>"
      }
    ]
  },
  "provider_enablement": {
    "capability": "<string>",
    "providersBefore": [
      "<string>"
    ],
    "providersAfter": [
      "<string>"
    ],
    "dropped": [
      {
        "providerId": "<string>",
        "reason": "<string>"
      }
    ]
  },
  "missing_pricing_providers": [
    "<string>"
  ],
  "provider_payment_required_provider": "openai",
  "provider_payment_required_support_notice": "Our upstream provider billing appears to be unavailable. If this persists, contact support.",
  "details": [
    {}
  ]
}