# OpenAI Chat Completion

Accomplish complex tasks like natural language processing, coding, translation, and creative writing with superior success using openai chat completion and its large context window.

## API Information

- **Model Slug:** openai-chat-completion
- **Branded URL:** https://www.eachlabs.ai/openai/gpt/openai-chat-completion
- **Provider:** OpenAI
- **Category:** Image to Text
- **Output Type:** text
- **Status:** active
- **Base Cost:** $0.0525–$15.75 per million tokens, depending on model and token type
- **Estimated Processing Time:** 1 seconds
- **Interactive Demo:** https://www.eachlabs.ai/ai-models/openai-chat-completion

## Pricing

- **Charge Type:** dynamic
- **Estimate:** $0.0525–$15.75 per million tokens, depending on model and token type
- **Pricing Details:** completion tokens: $15.75
- **Pricing Details:** prompt tokens: $2.63
- **Pricing Details:** completion tokens: $4.72
- **Pricing Details:** prompt tokens: $0.7875
- **Pricing Details:** completion tokens: $1.31
- **Pricing Details:** prompt tokens: $0.21
- **Pricing Details:** completion tokens: $14.70
- **Pricing Details:** prompt tokens: $1.84
- **Pricing Details:** completion tokens: $10.50
- **Pricing Details:** prompt tokens: $1.31
- **Pricing Details:** completion tokens: $10.50
- **Pricing Details:** prompt tokens: $1.31
- **Pricing Details:** completion tokens: $2.10
- **Pricing Details:** prompt tokens: $0.2625
- **Pricing Details:** completion tokens: $0.42
- **Pricing Details:** prompt tokens: $0.0525
- **Pricing Details:** completion tokens: $8.40
- **Pricing Details:** prompt tokens: $2.10
- **Pricing Details:** completion tokens: $1.68
- **Pricing Details:** prompt tokens: $0.42
- **Pricing Details:** completion tokens: $0.42
- **Pricing Details:** prompt tokens: $0.105
- **Pricing Details:** completion tokens: $0.63
- **Pricing Details:** prompt tokens: $0.1575
- **Pricing Details:** completion tokens: $8.40
- **Pricing Details:** prompt tokens: $2.10
- **Pricing Details:** completion tokens: $4.62
- **Pricing Details:** prompt tokens: $1.16
- **Pricing Details:** completion tokens: $4.62
- **Pricing Details:** prompt tokens: $1.16
- **Pricing Details:** completion tokens: $10.50
- **Pricing Details:** prompt tokens: $2.63

## Input Schema

| Parameter | Type | Required | Default | Constraints | Description |
|-----------|------|----------|---------|-------------|-------------|
| user_prompt | string | Yes | - | - | The user message or question for the model. Supports natural language instructions, questions, code tasks, and creative writing. |
| image_url | string | No | - | - | Optional image for vision analysis. When provided, the model analyzes the image alongside the text prompt. Supports JPEG, PNG, GIF, and WebP. Use for image description, visual Q&A, document analysis, or content extraction. |
| system_prompt | string | No | - | - | Instructions that define the model's behavior, tone, and constraints. Use for persona setup, output formatting, domain rules, or safety constraints. |
| model | string | Yes | gpt-4o | gpt-4.1, gpt-4.1-mini, gpt-4.1-nano, gpt-4o, gpt-4o-mini, gpt-5.1, gpt-5, gpt-5-mini, gpt-5-nano, o3-mini, o4-mini | OpenAI model to use. gpt-4.1: best quality/price balance, strong at coding and instruction following. gpt-4.1-mini/nano: faster and cheaper for simpler tasks. gpt-4o/4o-mini: multimodal with vision support. gpt-5/5.1: latest generation, highest capability. o3-mini/o4-mini: reasoning models for complex logic and math. |
| max_tokens | integer | No | 200 | 1–16384 | Maximum tokens in the response. 200 (default): concise answers. 512-1024: detailed explanations. 4096+: long-form content. |
| temperature | number | No | - | 0–2 | Controls response randomness. 0: deterministic. 0.3-0.7: balanced. 1.0 (default): creative. Not supported by o-series reasoning models. |

## Example Request

```bash
curl -X POST https://api.eachlabs.ai/v1/prediction/ \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "openai-chat-completion",
  "input": {
    "model": "gpt-4o",
    "user_prompt": "Hello from EachAI!"
  }
}'
```

## Output Schema

Response returned by `GET /v1/prediction/{id}` when the job completes:

```json
{
  "status": "success",
  "predictionID": "string",
  "output": "text",
  "metrics": {
    "predict_time": "number (seconds)"
  }
}
```

## Polling

```bash
curl https://api.eachlabs.ai/v1/prediction/{PREDICTION_ID} \
  -H "Authorization: Bearer YOUR_API_KEY"
```

| Status | Meaning |
|--------|---------|
| `processing` | Still running — poll again |
| `success` | Done — read `output` |
| `error` | Failed — read `message` / `details` |

## Webhook (alternative to polling)

Pass `"webhook_url": "https://your.host/path"` in the create request. Eachlabs POSTs this payload when the job ends:

```json
{
  "exec_id": "prediction-uuid",
  "status": "succeeded",
  "output": "https://...",
  "error": ""
}
```

`status` is `"succeeded"` or `"failed"`. `exec_id` equals the `predictionID` from create. Return 2xx within 30 seconds.

## Errors

Error body: `{ "status": "error", "message": "...", "details": "..." }`

| Code | Meaning |
|------|---------|
| `400` | Invalid input |
| `401` | Missing / invalid `Authorization` bearer token |
| `404` | Unknown model or prediction id |
| `429` | Rate limit — 100 creates / min, 10 concurrent per key |
| `5xx` | Retry with backoff |

## Overview

**openai-chat-completion — Text-to-Text AI Model**

Developed by OpenAI as part of the **gpt** family, **openai-chat-completion** empowers developers and creators to tackle complex tasks like natural language processing, coding, translation, and creative writing with exceptional accuracy and efficiency. This **text-to-text AI model** stands out with its massive context window—up to 1 million tokens in advanced variants like GPT-4.1-mini—enabling processing of entire documents or lengthy conversations without losing key details. Whether you're building **OpenAI chat completion API** integrations for chatbots or automating content generation, **openai-chat-completion** delivers superior performance for **OpenAI text-to-text** workflows, handling intricate prompts with precise, context-aware responses.

## Usage Notes

- API Base URL: `https://api.eachlabs.ai/v1`
- Authentication: send `Authorization: Bearer YOUR_API_KEY`. Generate a key from the Eachlabs dashboard at https://www.eachlabs.ai/dashboard/api-keys.
- File-typed parameters (`*_url`, `image_url`, `video_url`, `audio_url`, etc.) accept publicly-reachable HTTPS URLs only. Upload your asset first (GCS / S3 / your CDN) and pass the resulting URL. Data-URIs and localhost URLs are rejected.
- For structured parameters (arrays / objects) send real JSON values, not stringified payloads.
- Monetary values are reported in USD; per-token / per-megapixel rates may be billed in micro-cents internally.
- Prefer `webhook_url` over polling for long-running predictions — see the Webhook Callback section.