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docs/LTX2_PRO_IMPLEMENTATION_REVIEW.md

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+# LTX-2 Pro Implementation Review ✅
+
+## Documentation Review
+
+**Official API Documentation**: https://wavespeed.ai/docs/docs-api/lightricks/lightricks-ltx-2-pro-text-to-video
+
+### ✅ Implementation Verification
+
+| Feature | Official Docs | Our Implementation | Status |
+|---------|--------------|-------------------|--------|
+| **Duration** | 6, 8, 10 seconds | 6, 8, 10 seconds | ✅ Correct |
+| **generate_audio** | boolean, default: true | boolean, default: true | ✅ Correct |
+| **Resolution** | Fixed 1080p | Fixed 1080p (1920x1080) | ✅ Correct |
+| **Pricing** | $0.06/s (1080p) | $0.06/s (1080p) | ✅ Updated |
+| **prompt** | Required | Required | ✅ Correct |
+| **negative_prompt** | Not supported | Ignored with warning | ✅ Correct |
+| **seed** | Not supported | Ignored with warning | ✅ Correct |
+| **API Endpoint** | `lightricks/ltx-2-pro/text-to-video` | `lightricks/ltx-2-pro/text-to-video` | ✅ Correct |
+
+### ✅ Polling Implementation Review
+
+**Our Polling Implementation**:
+```python
+result = await asyncio.to_thread(
+    self.client.poll_until_complete,
+    prediction_id,
+    timeout_seconds=600,  # 10 minutes max
+    interval_seconds=0.5,  # Poll every 0.5 seconds
+    progress_callback=progress_callback,
+)
+```
+
+**WaveSpeedClient.poll_until_complete()** Features:
+- ✅ **Status Checking**: Checks for "completed" or "failed" status
+- ✅ **Timeout Handling**: 10-minute timeout (600 seconds)
+- ✅ **Polling Interval**: 0.5 seconds (fast polling)
+- ✅ **Progress Callbacks**: Supports real-time progress updates
+- ✅ **Error Handling**: 
+  - Transient errors (5xx): Retries with exponential backoff
+  - Non-transient errors (4xx): Fails after max consecutive errors
+  - Timeout: Raises HTTPException with prediction_id for resume
+- ✅ **Resume Support**: Returns prediction_id in error details for resume capability
+
+**Polling Flow**:
+1. ✅ Submit request → Get prediction_id
+2. ✅ Poll `/api/v3/predictions/{id}/result` every 0.5 seconds
+3. ✅ Check status: "created", "processing", "completed", or "failed"
+4. ✅ Handle errors with backoff and resume support
+5. ✅ Download video from `outputs[0]` when completed
+
+**Matches Official API Pattern**:
+- ✅ Uses GET `/api/v3/predictions/{id}/result` endpoint
+- ✅ Checks `data.status` field
+- ✅ Extracts `data.outputs` array for video URL
+- ✅ Handles `data.error` field for failures
+
+### ✅ Implementation Status
+
+**All Requirements Met**:
+- ✅ Correct API endpoint
+- ✅ Correct parameters (prompt, duration, generate_audio)
+- ✅ Correct validation (duration: 6, 8, 10)
+- ✅ Correct pricing ($0.06/s)
+- ✅ Correct polling implementation
+- ✅ Progress callbacks supported
+- ✅ Error handling with resume support
+- ✅ Metadata return (1920x1080, cost, prediction_id)
+
+## Polling Implementation Analysis
+
+### Strengths ✅
+
+1. **Robust Error Handling**:
+   - Distinguishes between transient (5xx) and non-transient (4xx) errors
+   - Exponential backoff for transient errors
+   - Max consecutive error limit for non-transient errors
+
+2. **Resume Support**:
+   - Returns `prediction_id` in error details
+   - Allows clients to resume polling later
+   - Critical for long-running tasks
+
+3. **Progress Tracking**:
+   - Supports progress callbacks for real-time updates
+   - Updates at key stages (submission, polling, completion)
+
+4. **Timeout Management**:
+   - 10-minute timeout prevents indefinite waiting
+   - Returns prediction_id for manual resume if needed
+
+5. **Efficient Polling**:
+   - 0.5-second interval balances responsiveness and API load
+   - Fast enough for good UX, not too aggressive
+
+### Potential Improvements (Optional)
+
+1. **Adaptive Polling**: Could slow down polling interval after initial attempts
+2. **Progress Estimation**: Could estimate progress based on elapsed time vs. typical duration
+3. **Webhook Support**: Could support webhooks instead of polling (if WaveSpeed supports it)
+
+### Conclusion
+
+✅ **Polling implementation is correct and robust**. It follows WaveSpeed API patterns, handles errors gracefully, and supports resume functionality. No changes needed.
+
+## Next Model Recommendation
+
+Based on the Lightricks family and our implementation pattern, I recommend:
+
+### 🎯 **LTX-2 Fast** (Recommended Next)
+
+**Why**:
+1. **Same Family**: Part of Lightricks LTX-2 series (consistent API patterns)
+2. **Likely Similar**: Probably similar parameters to LTX-2 Pro (easier implementation)
+3. **Use Case**: Fast generation for quick iterations (complements LTX-2 Pro)
+4. **Natural Progression**: Fast → Pro → Retake makes logical sense
+
+**Expected Differences**:
+- Likely faster generation (lower quality or smaller model)
+- Possibly different pricing
+- May have different duration options
+- May have different resolution options
+
+### Alternative: **LTX-2 Retake**
+
+**Why**:
+1. **Same Family**: Part of Lightricks LTX-2 series
+2. **Unique Feature**: "Retake" suggests ability to regenerate/refine videos
+3. **Production Workflow**: Complements Pro for production pipelines
+
+**Expected Differences**:
+- Likely requires input video or prediction_id
+- May have different parameters for refinement
+- May have different use case (refinement vs. generation)
+
+### Recommendation
+
+**Start with LTX-2 Fast** because:
+1. ✅ Likely simpler implementation (similar to Pro)
+2. ✅ Natural progression (Fast → Pro → Retake)
+3. ✅ Complements existing models (fast iteration + production quality)
+4. ✅ Easier to test and validate
+
+**Then implement LTX-2 Retake** for:
+1. ✅ Video refinement capabilities
+2. ✅ Complete LTX-2 family coverage
+3. ✅ Advanced production workflows
+
+## Summary
+
+✅ **LTX-2 Pro implementation is correct** and matches official documentation
+✅ **Polling implementation is robust** with proper error handling and resume support
+✅ **Pricing updated** to $0.06/s (was placeholder $0.10/s)
+✅ **Ready for production use**
+
+**Next Step**: Implement **LTX-2 Fast** following the same pattern.