GPT-4 & Codex
by OpenAI
OpenAI's GPT-4 is one of the most widely-used large language models, powering ChatGPT, Codex, and thousands of applications. It offers strong general-purpose capabilities across coding, writing, analysis, and creative tasks with a mature API ecosystem.
Best For
- General-purpose AI tasks
- Application development via API
- Code generation (Codex)
- Content creation at scale
- Plugin and tool ecosystems
Limitations
- Can be verbose in responses
- Knowledge cutoff applies
- API costs at scale
- Rate limiting on free tier
Key Features
GPT-4o multimodal model
Function calling / tool use
DALL-E image generation
Whisper speech-to-text
Assistants API with retrieval
Fine-tuning support
Pricing
Free tier with ChatGPT. Plus plan at $20/month. API: GPT-4o at $2.50/$10 per million input/output tokens.