# ✅ FIXED: LiteLLM Integration with LLMX

## The Root Cause

The `prompt_cache_key: Extra inputs are not permitted` error was caused by a **hardcoded default provider**.

**File**: `llmx-rs/core/src/config/mod.rs:983`
**Problem**: Default provider was set to `"openai"` which uses the Responses API
**Fix**: Changed default to `"litellm"` which uses the Chat Completions API

## The Error Chain

1. No provider specified → defaults to "openai"
2. OpenAI provider → uses `wire_api: WireApi::Responses`
3. Responses API → sends `prompt_cache_key` field in requests
4. LiteLLM Chat Completions API → rejects `prompt_cache_key` → 400 error

## The Solution

Changed one line in `llmx-rs/core/src/config/mod.rs`:

```rust
// BEFORE:
.unwrap_or_else(|| "openai".to_string());

// AFTER:
.unwrap_or_else(|| "litellm".to_string());
```

## Current Status ✅

- **Binary Built**: `llmx-rs/target/release/llmx` (44MB, built at 16:36)
- **Default Provider**: LiteLLM (uses Chat Completions API)
- **Default Model**: `anthropic/claude-sonnet-4-20250514`
- **Commit**: `e3507a7f`

## How to Use Now

### Option 1: Use Environment Variables (Recommended)

```bash
export LITELLM_BASE_URL="https://llm.ai.pivoine.art/v1"
export LITELLM_API_KEY="your-api-key"

# Just run - no config needed!
./llmx-rs/target/release/llmx "hello world"
```

### Option 2: Use Config File

Config at `~/.llmx/config.toml` (already created):
```toml
model_provider = "litellm"  # Optional - this is now the default!
model = "anthropic/claude-sonnet-4-20250514"
```

### Option 3: Override via CLI

```bash
./llmx-rs/target/release/llmx -m "openai/gpt-4" "hello"
```

## What This Fixes

✅ No more `prompt_cache_key` errors
✅ Correct API endpoint (`/v1/chat/completions`)
✅ Works with LiteLLM proxy out of the box
✅ No manual provider configuration needed
✅ Config file is now optional (defaults work)

## Commits in This Session

1. **831e6fa6** - Complete comprehensive Llmx → LLMX branding (78 files, 242 changes)
2. **424090f2** - Add LiteLLM setup documentation
3. **e3507a7f** - Fix default provider from 'openai' to 'litellm' ⭐

## Testing

Try this now:
```bash
export LITELLM_BASE_URL="https://llm.ai.pivoine.art/v1"
export LITELLM_API_KEY="your-key"
./llmx-rs/target/release/llmx "say hello"
```

Should work without any 400 errors!

## Binary Location

```
/home/valknar/Projects/llmx/llmx/llmx-rs/target/release/llmx
```

Built: November 11, 2025 at 16:36
Size: 44MB
Version: 0.0.0