# LLM Models — Topic Index

> Reference catalog of language models across providers. Use when selecting a model for a task, comparing capabilities, or checking API availability.

| Article | Summary | Source | Updated |
|---------|---------|--------|---------|
| [[wiki/llm-models/openai-model-catalog\|OpenAI Model Catalog]] | All OpenAI API models: GPT-5.x, o-series reasoning, audio/realtime, embeddings, moderation | OpenAI API Docs | 2026-04-17 |
| [[wiki/llm-models/claude-model-catalog\|Claude Model Catalog]] | Opus/Sonnet/Haiku 4.x — IDs, context windows, when to use each, API usage, Fast Mode | Claude Code system context | 2026-04-17 |