# Feature Compatibility

## Feature Compatibility

### Fully Supported

```
✓ chat.completions.create
✓ Streaming responses
✓ Function/tool calling
✓ JSON mode
✓ System messages
✓ Multi-turn conversations
✓ Temperature, top_p, max_tokens
✓ Stop sequences
✓ Presence/frequency penalty
```

### OpenRouter Extras

```
Additional features via OpenRouter:
- Access to 100+ models (not just OpenAI)
- Automatic fallbacks
- Cost tracking per request
- Model comparison
- Provider routing
```

### Not Applicable

```
✗ Assistants API (OpenAI specific)
✗ File uploads to OpenAI
✗ Fine-tuning API
✗ Embeddings (use directly or separate service)
✗ Images (DALL-E - use directly)
✗ Audio (Whisper - use directly)
```
