OpenAI

GPT 3.5 Turbo

Name: GPT 3.5 Turbo
Brand: OpenAI
Price: 0.5 USD
Availability: InStock

GPT 3.5 Turbo is a large language model by OpenAI with support for function calling and prompt caching. It supports a 16K token context window with up to 4K tokens of output. Priced at $0.5 per million input tokens and $1.5 per million output tokens, it is one of the most cost-efficient options in its class. Access GPT 3.5 Turbo through Inworld Router with OpenAI SDK compatibility, built-in failover, and intelligent routing across providers.

→Function CallingPrompt Caching

Use This Model

Step 1 — Create Router

curl --location 'https://api.inworld.ai/router/v1/routers' \
--header 'Authorization: Basic <your-api-key>' \
--header 'Content-Type: application/json' \
--data '{
  "name": "compare-frontier-models",
  "defaultRoute": {
    "route_id": "default",
    "variants": [
      {
        "variant": {
          "variant_id": "openai/gpt-3.5-turbo-a",
          "model_id": "openai/gpt-3.5-turbo"
        },
        "weight": 33
      },
      {
        "variant": {
          "variant_id": "openai/gpt-4.1-b",
          "model_id": "openai/gpt-4.1"
        },
        "weight": 33
      },
      {
        "variant": {
          "variant_id": "openai/gpt-4.1-mini-c",
          "model_id": "openai/gpt-4.1-mini"
        },
        "weight": 34
      }
    ]
  }
}'

import requests

response = requests.post(
    "https://api.inworld.ai/router/v1/routers",
    headers={
        "Authorization": "Basic <your-api-key>",
        "Content-Type": "application/json",
    },
    json={
        "name": "compare-frontier-models",
        "defaultRoute": {
            "route_id": "default",
            "variants": [
                {
                    "variant": {
                        "variant_id": "openai/gpt-3.5-turbo-a",
                        "model_id": "openai/gpt-3.5-turbo"
                    },
                    "weight": 33
                },
                {
                    "variant": {
                        "variant_id": "openai/gpt-4.1-b",
                        "model_id": "openai/gpt-4.1"
                    },
                    "weight": 33
                },
                {
                    "variant": {
                        "variant_id": "openai/gpt-4.1-mini-c",
                        "model_id": "openai/gpt-4.1-mini"
                    },
                    "weight": 34
                }
            ]
        }
    },
)
print(response.json())

const response = await fetch(
  "https://api.inworld.ai/router/v1/routers",
  {
    method: "POST",
    headers: {
      Authorization: "Basic <your-api-key>",
      "Content-Type": "application/json",
    },
    body: JSON.stringify({
      name: "compare-frontier-models",
      defaultRoute: {
        route_id: "default",
        variants: [
          {
            variant: {
              variant_id: "openai/gpt-3.5-turbo-a",
              model_id: "openai/gpt-3.5-turbo",
            },
            weight: 33,
          },
          {
            variant: {
              variant_id: "openai/gpt-4.1-b",
              model_id: "openai/gpt-4.1",
            },
            weight: 33,
          },
          {
            variant: {
              variant_id: "openai/gpt-4.1-mini-c",
              model_id: "openai/gpt-4.1-mini",
            },
            weight: 34,
          },
        ],
      },
    }),
  }
);
const data = await response.json();
console.log(data);

Step 2 — Chat Completion

curl --location 'https://api.inworld.ai/v1/chat/completions' \
--header 'Authorization: Basic <your-api-key>' \
--header 'Content-Type: application/json' \
--data '{
  "model": "inworld/compare-frontier-models",
  "messages": [{"role": "user", "content": "Hello!"}]
}'

GPT 3.5 Turbo pricing and providers

Access GPT 3.5 Turbo through OpenAI via Inworld Router or Realtime API. By using the AI provider(s) below you acknowledge you reviewed and agree to their terms listed in the Legal section under the AI provider's name.

					Capabilities	Input modalities	Output modalities
OpenAI	16.4K	4.1K	$0.50	$1.50

Other OpenAI models available through Inworld

Compare GPT 3.5 Turbo with other OpenAI models available through Inworld Router or Realtime API.

					Capabilities
GPT 4.1	1M	32.8K	$2.00	$8.00	+2
GPT 4.1 Mini	1M	32.8K	$0.40	$1.60	+2
GPT 4.1 Nano	1M	32.8K	$0.10	$0.40	+1
GPT 4.1 Nano 2025 04 14	1M	32.8K	$0.10	$0.40	+1
GPT 4o	128K	16.4K	$2.50	$10.00	+1
GPT 4o 2024 08 06	128K	16.4K	$2.50	$10.00	+1
GPT 4o Mini	128K	16.4K	$0.15	$0.60	+1
GPT 4o Mini 2024 07 18	128K	16.4K	$0.15	$0.60	+1
GPT 4o Mini Audio Preview	—	—	$0.15	$0.60	—
GPT 5 Mini	272K	128K	$0.25	$2.00	+4
GPT 5 Nano	272K	128K	$0.05	$0.40	+4
GPT 5.2	272K	128K	$1.75	$14.00	+4
GPT 5.4	1.1M	128K	$2.50	$15.00	+3
GPT 5.4 Mini	272K	128K	$0.75	$4.50	+4
GPT 5.4 Nano	272K	128K	$0.20	$1.25	+4
GPT 5.5	1.1M	128K	$5.00	$30.00	+4
GPT Audio Mini	128K	16.4K	$0.60	$2.40
Openai/gpt Oss 120b	131.1K	131.1K	$0.039	$0.19	+2
Openai/gpt Oss 120b Turbo	—	—	$0.15	$0.60	—
Openai/gpt Oss 20b	131.1K	32.8K	$0.075	$0.30	+2
Openai/gpt Oss Safeguard 20b	131.1K	65.5K	$0.075	$0.30	+2

View all models

Start building with GPT 3.5 Turbo

Access GPT 3.5 Turbo and every other model through Inworld Router or Realtime API. Create your free account and start routing in minutes.

Get Started Free Contact Sales