# LLM Gateway – Features & Implementation Status

This document provides a high-level overview of the LLM Gateway's capabilities and the current production status of each component.

## Core Features

- **Unified Interface**: Single API surface for text, image, video, and audio generation, abstracting away provider-specific SDKs.
- **Provider Agnostic**: Switch between Gemini, Hugging Face, Stability, WaveSpeed, etc., via configuration or runtime parameters.
- **Subscription Enforcement**: Strict pre-flight checks against user plans (Free, Basic, Pro, Enterprise) before any API call.
- **Cost Awareness**: Granular tracking of input/output tokens, request counts, and media generation costs per provider/model.
- **Resilience**: Built-in retries (exponential backoff) for transient failures (rate limits, timeouts).
- **Observability**: Centralized logging (`APIUsageLog`) and usage aggregation (`UsageSummary`) for all modalities.
- **Streaming Support**: (Partial) Infrastructure exists for text streaming, though primarily used for blocking responses currently.

## Implementation Status

### 1. Text Generation
| Feature | Provider | Status | Notes |
| :--- | :--- | :--- | :--- |
| **Chat/Completion** | Google Gemini | ✅ Production | Default provider. Supports `gemini-2.0-flash`. |
| **Chat/Completion** | Hugging Face | ✅ Production | via Inference Providers (e.g., `mistralai/Mistral-7B`). |
| **Structured JSON** | Gemini | ✅ Production | Uses `response_schema` for reliable parsing. |
| **Structured JSON** | Hugging Face | ✅ Production | Uses `response_format={ "type": "json_object" }`. |

### 2. Image Generation
| Feature | Provider | Status | Notes |
| :--- | :--- | :--- | :--- |
| **Text-to-Image** | Google Gemini | ✅ Production | Imagen 3 models. |
| **Text-to-Image** | Hugging Face | ✅ Production | FLUX.1 via fal-ai/Black Forest Labs. |
| **Text-to-Image** | Stability AI | ✅ Production | Core/SD3 models. |
| **Text-to-Image** | WaveSpeed | ✅ Production | High-speed generation. |
| **Image Editing** | WaveSpeed | ✅ Production | Inpainting, background removal, face swap. |

### 3. Video Generation
| Feature | Provider | Status | Notes |
| :--- | :--- | :--- | :--- |
| **Text-to-Video** | WaveSpeed | ✅ Production | HunyuanVideo-1.5, LTX-2 Pro. |
| **Image-to-Video** | WaveSpeed | 🚧 Planned | Roadmap item. |

### 4. Audio Generation
| Feature | Provider | Status | Notes |
| :--- | :--- | :--- | :--- |
| **Text-to-Speech** | Gemini | ✅ Production | Audio generation capability. |
| **Text-to-Speech** | WaveSpeed | ✅ Production | Fast TTS. |
| **Speech-to-Text** | Gemini | ✅ Production | Transcription (via `audio_to_text_generation`). |

### 5. Research & Tools
| Feature | Provider | Status | Notes |
| :--- | :--- | :--- | :--- |
| **Web Search** | Tavily | ✅ Production | Integrated for grounded research. |
| **Web Search** | Serper | ✅ Production | Google Search API alternative. |
| **Web Search** | Exa | ✅ Production | Neural search. |

## Roadmap & Next Steps

- **Streaming Standardization**: Unify streaming interfaces across all text providers for consistent frontend UX.
- **Model Fallbacks**: Automatic failover to secondary providers if the primary is down (currently manual/env-based).
- **Fine-tuning Support**: Add gateway endpoints for triggering and using fine-tuned jobs.
- **Caching Layer**: Redis-based semantic caching for frequent queries to reduce costs.
