---
title: "GPT API — All variants, pricing, code samples | RunAPI"
url: "https://runapi.ai/models/gpt.md"
canonical: "https://runapi.ai/models/gpt.md"
locale: "en"
model: "GPT"
provider: "OpenAI"
modality: "text"
variant_count: 11
price_from_cents: 3
---

# GPT

OpenAI's flagship LLM for chat, code generation, and multi-step reasoning tasks.

**Provider:** OpenAI
**Modality:** Text
**Catalog:** 11 variants

GPT is OpenAI's flagship large language model series, with the GPT-5 family delivering state-of-the-art performance in chat, code generation, and multi-step reasoning. Available in multiple capability tiers.

## Variants

| Version | Variant | Pricing | Billing | URL |
|---|---|---|---|---|
| codex-auto-review | `codex-auto-review` | $0.130 | 1K tokens | https://runapi.ai/models/gpt/codex-auto-review.md |
| gpt-5.2 | `5.2` | $0.130 | 1K tokens | https://runapi.ai/models/gpt/5.2.md |
| gpt-5.2-pro | `5.2-pro` | $1.00 | 1K tokens | https://runapi.ai/models/gpt/5.2-pro.md |
| gpt-5.3-codex | `5.3-codex` | $0.130 | 1K tokens | https://runapi.ai/models/gpt/5.3-codex.md |
| gpt-5.3-codex-spark | `5.3-codex-spark` | $0.050 | 1K tokens | https://runapi.ai/models/gpt/5.3-codex-spark.md |
| gpt-5.4 | `5.4` | $0.130 | 1K tokens | https://runapi.ai/models/gpt/5.4.md |
| gpt-5.4-mini | `5.4-mini` | $0.050 | 1K tokens | https://runapi.ai/models/gpt/5.4-mini.md |
| gpt-5.4-nano | `5.4-nano` | $0.030 | 1K tokens | https://runapi.ai/models/gpt/5.4-nano.md |
| gpt-5.4-pro | `5.4-pro` | $1.25 | 1K tokens | https://runapi.ai/models/gpt/5.4-pro.md |
| gpt-5.5 | `5.5` | $0.250 | 1K tokens | https://runapi.ai/models/gpt/5.5.md |
| gpt-5.5-pro | `5.5-pro` | $1.25 | 1K tokens | https://runapi.ai/models/gpt/5.5-pro.md |


## Install

```sh
npm install @runapi.ai/gpt
# or
gem install runapi-gpt
```

## Quickstart

```sh
curl -X POST https://runapi.ai/v1/chat/completions \
  -H "Authorization: Bearer $RUNAPI_KEY" \
  -H "Content-Type: application/json" \
  -d '{ "model": "codex-auto-review", "prompt": "..." }'
```

## Context

GPT is OpenAI's frontier LLM family, spanning standard and mini variants for different cost-performance trade-offs. Through RunAPI, all GPT models share the same API shape and billing.

## FAQ

### Which variant should I start with?

Pick the cheapest variant that meets your quality bar. Most teams start on the fast variant and graduate to pro for production.

### Is there a free tier?

New accounts get free first calls on every model. After that, pay per call.

### Do you stream results?

Where streaming is available, RunAPI streams end-to-end.

### How are failures billed?

Failed generations are not charged.

### Are outputs cached?

Generated outputs are stored and retrievable by task ID. Inputs are not cached.

### Can I use commercially?

Yes — commercial use is included for every variant unless a model license explicitly restricts it, which is called out on the variant page.

### What about rate limits?

Per-key rate limits scale with usage tier. See pricing page for current limits.

### Where can I report issues?

Open an issue on the public GitHub repo or email support.