> ## Documentation Index
> Fetch the complete documentation index at: https://docs.splox.io/llms.txt
> Use this file to discover all available pages before exploring further.
# OpenAI
> GPT-4, GPT-5, o-series reasoning models, and Codex
**OpenAI** provides industry-leading AI models:
* **GPT-5 Series** - Latest generation language models
* **o-series** - Advanced reasoning capabilities
* **Multimodal** - Vision and audio understanding
* **Codex** - Specialized code generation
***
## Available Models
### GPT-5.1 Series
Enhanced GPT-5 models with improved performance.
| Model | Input | Output | Best For |
| ---------------------- | -------- | --------- | --------------------------------------- |
| **GPT-5.1** | \$1.63/M | \$13.00/M | General purpose, balanced performance |
| **GPT-5.1 Chat** | \$1.63/M | \$13.00/M | Chat applications, conversational AI |
| **GPT-5.1 Codex** | \$1.63/M | \$13.00/M | Code generation, development assistance |
| **GPT-5.1 Codex Max** | \$1.63/M | \$13.00/M | Advanced code generation, complex tasks |
| **GPT-5.1 Codex Mini** | \$1.63/M | \$13.00/M | Lightweight code tasks, fast responses |
### GPT-5 Series
Latest generation models with enhanced capabilities.
| Model | Input | Output | Best For |
| --------------------- | --------- | ---------- | ------------------------------------------- |
| **GPT-5 Pro** | \$19.50/M | \$156.00/M | Complex analysis, research, premium quality |
| **GPT-5** | \$1.62/M | \$13.00/M | General purpose, production apps |
| **GPT-5 Chat Latest** | \$1.62/M | \$13.00/M | Chat applications, conversational AI |
| **GPT-5 Codex** | \$1.62/M | \$13.00/M | Code generation, debugging, development |
| **GPT-5 Mini** | \$0.33/M | \$2.60/M | High-volume, cost-efficient tasks |
| **GPT-5 Nano** | \$0.07/M | \$0.52/M | Simple tasks, embeddings, classification |
### GPT-4o Series
Multimodal models with vision capabilities.
| Model | Input | Output | Best For |
| ------------------------------------------- | -------- | --------- | ------------------------------------ |
| **GPT-4o** | \$3.25/M | \$13.00/M | Vision, multimodal tasks, production |
| **GPT-4o (2024-11-20)** | \$3.25/M | \$13.00/M | Latest stable 4o |
| **GPT-4o (2024-05-13)** | \$3.25/M | \$13.00/M | Original 4o release |
| **GPT-4o Search Preview** | \$3.25/M | \$13.00/M | Search-enhanced queries |
| **GPT-4o Search Preview (2025-03-11)** | \$3.25/M | \$13.00/M | Dated search preview |
| **GPT-4o Mini** | \$0.20/M | \$0.78/M | Fast, cost-efficient vision |
| **GPT-4o Mini (2024-07-18)** | \$0.20/M | \$0.78/M | Stable mini release |
| **GPT-4o Mini Search Preview** | \$0.20/M | \$0.78/M | Budget search tasks |
| **GPT-4o Mini Search Preview (2025-03-11)** | \$0.20/M | \$0.78/M | Dated mini search |
### GPT-4.1 Series
Reliable, proven models for production.
| Model | Input | Output | Best For |
| ----------------------------- | -------- | --------- | ---------------------------------- |
| **GPT-4.1** | \$2.60/M | \$10.40/M | Production applications, stability |
| **GPT-4.1 (2025-04-14)** | \$2.60/M | \$10.40/M | Dated stable version |
| **GPT-4.1 Mini** | \$0.52/M | \$2.08/M | Cost-efficient production |
| **GPT-4.1 Mini (2025-04-14)** | \$0.52/M | \$2.08/M | Dated mini version |
| **GPT-4.1 Nano** | \$0.13/M | \$0.52/M | High-volume, simple tasks |
| **GPT-4.1 Nano (2025-04-14)** | \$0.13/M | \$0.52/M | Dated nano version |
### o-series (Reasoning Models)
Advanced reasoning models that "think" before responding.
| Model | Input | Output | Best For |
| ------------------------- | ---------- | ---------- | ----------------------------------- |
| **o1 Pro** | \$195.00/M | \$780.00/M | Premium reasoning, complex research |
| **o1 Pro (2025-03-19)** | \$195.00/M | \$780.00/M | Dated pro version |
| **o3 Deep Research** | \$130.00/M | \$520.00/M | Extended multi-step research |
| **o3** | \$13.00/M | \$52.00/M | Complex reasoning, math, code |
| **o3 (2025-04-16)** | \$13.00/M | \$52.00/M | Dated o3 version |
| **o4-mini Deep Research** | \$26.00/M | \$104.00/M | Cost-effective research |
| **o1** | \$19.50/M | \$78.00/M | Advanced reasoning tasks |
| **o1 (2024-12-17)** | \$19.50/M | \$78.00/M | Dated o1 version |
| **o3 Mini** | \$1.43/M | \$5.72/M | Balanced reasoning tasks |
| **o3 Mini (2025-01-31)** | \$1.43/M | \$5.72/M | Dated mini version |
| **o4-mini** | \$0.71/M | \$2.86/M | Fast reasoning, lower cost |
| **o4-mini (2025-04-16)** | \$0.71/M | \$2.86/M | Dated o4-mini version |
***
## Best Practices
### Model Selection
* Latest capabilities
* Best overall performance
* Production applications
* Cutting-edge features
* Vision tasks
* Multimodal needs
* Consistent quality
* Stable production
* Complex reasoning
* Math problems
* Code debugging
* Research tasks
* High-volume requests
* Simple tasks
* Cost optimization
* Fast responses
### Prompt Caching
**Optimize costs with prompt caching:**
* **First request**: Full cost (\$1.25/M for GPT-5)
* **Cached requests**: 90% discount (\$0.13/M)
* **Cache duration**: 5 minutes of inactivity
**Perfect for:**
* Chatbots with large system prompts
* Document analysis with consistent context
* Multi-turn conversations
* RAG applications with static knowledge
### Context Windows
OpenAI models support large context:
* **GPT-4o**: Up to **128K tokens** (\~100K words)
* **GPT-5**: Up to **128K tokens** (\~100K words)
* **o-series**: Up to **128K tokens** (includes reasoning tokens)
***
## Support
Need help with OpenAI integration?
Official OpenAI documentation
Official pricing details
Browse our guides
Get help from the community