---
title: OpenAI: GPT 5 Codex API | Text Generation | ModelsLab
description: **Advanced LLM for agentic coding with 400K token context, multimodal input, 25% faster inference, and superior benchmarks in Terminal-Bench, OSWorld for.
url: https://modelslab.com/models/openai/openai-gpt-5-codex/api.md
canonical: https://modelslab.com/models/openai/openai-gpt-5-codex/api.md
type: product
component: Playground/LLM/Index
generated_at: 2026-04-15T02:04:10.776657Z
---

OpenAI: GPT-5 Codex
---

 [LLMs.txt](https://modelslab.com/models/open_router/openai-gpt-5-codex/llms.txt) [.md](https://modelslab.com/models/openai/openai-gpt-5-codex.md)

openai-gpt-5-codex openai Closed Source Model $5.625000 / call

OpenAI: GPT-5 Codex
---

Choose a prompt below to get started or type your own message

 Explain quantum computing in simple terms

 Write a Python function to sort a list

 Create a marketing email for a SaaS product

 Compare REST vs GraphQL APIs

Send

### OpenAI: GPT-5 Codex

openai openai-gpt-5-codex

Copy model ID

PricingInput $1.25 / 1M tokens

Output $10.00 / 1M tokens

API EndpointsOpenAI Compatible

`https://modelslab.com/api/v7/llm/chat/completions`Endpoint

Anthropic Compatible

`https://modelslab.com/api/v7/llm/v1/messages`Messages

`https://modelslab.com/api/v7/llm/v1/messages/count_tokens`Count Tokens

`https://modelslab.com/api/v7/llm/v1/models`Models

Use with Claude Code

cURL Example

ParametersSystem MessageYou are a helpful AI assistant specialized in providing accurate and detailed responses.

Temperature0.7

Max Tokens1000

Top P0.9

Frequency Penalty0

Presence Penalty0

Model Info

Support

Related Models
---

Discover similar models you might be interested in

 [View all LLM Models](https://modelslab.com/models?feature=llmaster)

[Q7](https://modelslab.com/models/qwen/Qwen-Qwen2.5-7B-Instruct-Turbo)[ModelsLab](https://modelslab.com/models/qwen)

 [Qwen2.5 7B Instruct Turbo

Closed Source Model](https://modelslab.com/models/qwen/Qwen-Qwen2.5-7B-Instruct-Turbo)

[![Gemini 2.5 Flash Image Preview ](https://images.stablediffusionapi.com/?Image=https://assets.modelslab.ai/generations/97c6f065-57f9-45b0-a190-08e5f97f70a8.png)](https://modelslab.com/models/google/gemini-2.5-flash-image-preview)[Google](https://modelslab.com/models/google)

 [Gemini 2.5 Flash Image Preview

Closed Source Model](https://modelslab.com/models/google/gemini-2.5-flash-image-preview)

[SL](https://modelslab.com/models/open_router/sao10k-l3-lunaris-8b)[Open Router](https://modelslab.com/models/open_router)

 [Sao10K: Llama 3 8B Lunaris

Closed Source Model](https://modelslab.com/models/open_router/sao10k-l3-lunaris-8b)

[MM](https://modelslab.com/models/open_router/mistralai-mixtral-8x22b-instruct)[Open Router](https://modelslab.com/models/open_router)

 [Mistral: Mixtral 8x22B Instruct

Closed Source Model](https://modelslab.com/models/open_router/mistralai-mixtral-8x22b-instruct)

[![Gemini 3 Pro Preview](https://images.stablediffusionapi.com/?Image=https://assets.modelslab.ai/generations/1846e76f-9d5c-4a35-a43a-82db45b7bb8b.png)](https://modelslab.com/models/google/gemini-3-pro-preview)[Google](https://modelslab.com/models/google)

 [Gemini 3 Pro Preview

Closed Source Model](https://modelslab.com/models/google/gemini-3-pro-preview)

[ML](https://modelslab.com/models/together_ai/meta-llama-Llama-3.1-405B-Instruct)[Together AI](https://modelslab.com/models/together_ai)

 [Meta Llama 3.1 405B Instruct

Closed Source Model](https://modelslab.com/models/together_ai/meta-llama-Llama-3.1-405B-Instruct)

[DV](https://modelslab.com/models/together_ai/deepseek-ai-DeepSeek-V3.2-Exp)[Together AI](https://modelslab.com/models/together_ai)

 [Deepseek V3.2 Exp

Closed Source Model](https://modelslab.com/models/together_ai/deepseek-ai-DeepSeek-V3.2-Exp)

[L2](https://modelslab.com/models/together_ai/LiquidAI-LFM2-24B-A2B)[Together AI](https://modelslab.com/models/together_ai)

 [LFM2-24B-A2B

Closed Source Model](https://modelslab.com/models/together_ai/LiquidAI-LFM2-24B-A2B)

[G3](https://modelslab.com/models/together_ai/google-gemma-3-270m-it)[Together AI](https://modelslab.com/models/together_ai)

 [Gemma 3 270M It

Closed Source Model](https://modelslab.com/models/together_ai/google-gemma-3-270m-it)

[QC](https://modelslab.com/models/together_ai/Qwen-Qwen3-Coder-Next-FP8)[Together AI](https://modelslab.com/models/together_ai)

 [Qwen3 Coder Next Fp8

Closed Source Model](https://modelslab.com/models/together_ai/Qwen-Qwen3-Coder-Next-FP8)

[VU](https://modelslab.com/models/open_router/cognitivecomputations-dolphin-mistral-24b-venice-edition-free)[Open Router](https://modelslab.com/models/open_router)

 [Venice: Uncensored (free)

Closed Source Model](https://modelslab.com/models/open_router/cognitivecomputations-dolphin-mistral-24b-venice-edition-free)

[Q7](https://modelslab.com/models/together_ai/Qwen-Qwen2.5-7B-Instruct)[Together AI](https://modelslab.com/models/together_ai)

 [Qwen2.5 7B Instruct

Closed Source Model](https://modelslab.com/models/together_ai/Qwen-Qwen2.5-7B-Instruct)

[MM](https://modelslab.com/models/open_router/mistralai-mistral-small-3.1-24b-instruct)[Open Router](https://modelslab.com/models/open_router)

 [Mistral: Mistral Small 3.1 24B

Closed Source Model](https://modelslab.com/models/open_router/mistralai-mistral-small-3.1-24b-instruct)

[ML](https://modelslab.com/models/together_ai/togethercomputer-meta-llama-3.1-8B-Instruct-AWQ-INT4)[Together AI](https://modelslab.com/models/together_ai)

 [Meta Llama 3.1 8B Instruct Awq Int4

Closed Source Model](https://modelslab.com/models/together_ai/togethercomputer-meta-llama-3.1-8B-Instruct-AWQ-INT4)

[OO](https://modelslab.com/models/open_router/openai-o3-mini)[Open Router](https://modelslab.com/models/open_router)

 [OpenAI: o3 Mini

Closed Source Model](https://modelslab.com/models/open_router/openai-o3-mini)

[M1](https://modelslab.com/models/open_router/gryphe-mythomax-l2-13b)[Open Router](https://modelslab.com/models/open_router)

 [MythoMax 13B

Closed Source Model](https://modelslab.com/models/open_router/gryphe-mythomax-l2-13b)

[AA](https://modelslab.com/models/open_router/aion-labs-aion-1.0-mini)[Open Router](https://modelslab.com/models/open_router)

 [AionLabs: Aion-1.0-Mini

Closed Source Model](https://modelslab.com/models/open_router/aion-labs-aion-1.0-mini)

[MM](https://modelslab.com/models/open_router/mistralai-ministral-8b-2512)[Open Router](https://modelslab.com/models/open_router)

 [Mistral: Ministral 3 8B 2512

Closed Source Model](https://modelslab.com/models/open_router/mistralai-ministral-8b-2512)

About OpenAI: GPT-5 Codex
---

GPT-5-Codex is a specialized version of GPT-5 optimized for software engineering and coding workflows. It is designed for both interactive development sessions and long, independent execution of complex engineering tasks....

### Technical Specifications

Model IDopenai-gpt-5-codexCategoryLLM ModelsTaskText GenerationPrice$5.625000 per million tokensAddedFebruary 20, 2026

### Key Features

- Chat completion and multi-turn conversation API
- Streaming response with token-by-token output
- Function calling and tool use support
- System prompts and role-based messaging
- JSON mode and structured output

### Quick Start

Integrate OpenAI: GPT-5 Codex into your application with a single API call. Get your API key from the [pricing page](https://modelslab.com/pricing) to get started.

PythonJavaScriptcURLPHP

```
<code>import requests
import json

url = "https://modelslab.com/api/v7/llm/chat/completions"

headers = {
    "Content-Type": "application/json"
}

data = {
        "model_id": "openai-gpt-5-codex",
        "messages": [
            {
                "role": "user",
                "content": "Hello!"
            }
        ],
        "max_tokens": 1000,
        "key": "YOUR_API_KEY"
    }

try:
    response = requests.post(url, headers=headers, json=data)
    response.raise_for_status()  # Raises an HTTPError for bad responses (4XX or 5XX)
    result = response.json()
    print("API Response:")
    print(json.dumps(result, indent=2))
except requests.exceptions.HTTPError as http_err:
    print(f"HTTP error occurred: {http_err} - {response.text}")
except Exception as err:
    print(f"Other error occurred: {err}")</code>
```

View the [full API documentation](https://modelslab.com/models/openai/openai-gpt-5-codex/api) for SDKs, code examples in Python, JavaScript, and more.

### Pricing

OpenAI: GPT-5 Codex API costs $5.625000 per million tokens. Pay only for what you use with no minimum commitments. [View pricing plans](https://modelslab.com/pricing)

### Use Cases

- AI chatbots and virtual assistants
- Code generation and developer tools
- Content writing and copywriting automation
- Data analysis, summarization, and extraction

[Browse LLM Models](https://modelslab.com/models?feature=llmaster) [More from Openai](https://modelslab.com/models/open_router) [View Pricing](https://modelslab.com/pricing)

OpenAI: GPT-5 Codex FAQ
---

### What is OpenAI: GPT-5 Codex?

GPT-5-Codex is a specialized version of GPT-5 optimized for software engineering and coding workflows. It is designed for both interactive development sessions and long, independent execution of complex engineering tasks....

### How do I use the OpenAI: GPT-5 Codex API?

You can integrate OpenAI: GPT-5 Codex into your application with a single API call. Sign up on ModelsLab to get your API key, then use the model ID "openai-gpt-5-codex" in your API requests. We provide SDKs for Python, JavaScript, and cURL examples in the API documentation.

### How much does OpenAI: GPT-5 Codex cost?

OpenAI: GPT-5 Codex costs $5.625000 per million tokens. ModelsLab uses pay-per-use pricing with no minimum commitments. A free tier is available to get started.

### What is the OpenAI: GPT-5 Codex model ID?

The model ID for OpenAI: GPT-5 Codex is "openai-gpt-5-codex". Use this ID in your API requests to specify this model.

### Does OpenAI: GPT-5 Codex have a free tier?

Yes, ModelsLab offers a free tier that lets you try OpenAI: GPT-5 Codex and other AI models. Sign up to get free API credits and start building immediately.

---

*This markdown version is optimized for AI agents and LLMs.*

**Links:**
- [Website](https://modelslab.com)
- [API Documentation](https://docs.modelslab.com)
- [Blog](https://modelslab.com/blog)

---
*Generated by ModelsLab - 2026-04-15*