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| 1 | +# CortexIDE Model Support & Code Editing Capabilities Comparison |
| 2 | + |
| 3 | +## Table 1: Model Support |
| 4 | + |
| 5 | +| Capability / Model | CortexIDE | Cursor | Windsurf | Continue.dev | Void | Code Proof (for CortexIDE) | Notes | |
| 6 | +|-------------------|-----------|--------|----------|--------------|------|----------------------------|-------| |
| 7 | +| **Local Ollama** | ✅ Yes | ⚠️ Limited | ❌ No | ✅ Yes | ⚠️ Limited | `modelCapabilities.ts:1174-1309`, `sendLLMMessage.impl.ts:1403-1407` | Full support with auto-detection, model listing, FIM support. Ollama is OpenAI-compatible. | |
| 8 | +| **Local vLLM** | ✅ Yes | ❌ No | ❌ No | ❓ Unknown | ❌ No | `modelCapabilities.ts:1261-1276`, `sendLLMMessage.impl.ts:1418-1422` | OpenAI-compatible endpoint support with reasoning content parsing. | |
| 9 | +| **Local LM Studio** | ✅ Yes | ❌ No | ❌ No | ❓ Unknown | ❌ No | `modelCapabilities.ts:1278-1292`, `sendLLMMessage.impl.ts:1434-1439` | OpenAI-compatible with model listing. Note: FIM may not work due to missing suffix parameter. | |
| 10 | +| **Local OpenAI-compatible (LiteLLM / FastAPI / localhost)** | ✅ Yes | ❌ No | ❌ No | ⚠️ Limited | ❌ No | `modelCapabilities.ts:1311-1342`, `sendLLMMessage.impl.ts:1408-1412,1440-1444` | Supports any OpenAI-compatible endpoint. Auto-detects localhost for connection pooling. | |
| 11 | +| **Remote OpenAI** | ✅ Yes | ✅ Yes | ✅ Yes | ✅ Yes | ⚠️ Limited | `modelCapabilities.ts:74-84`, `sendLLMMessage.impl.ts:1383-1387` | Full support including reasoning models (o1, o3). | |
| 12 | +| **Remote Anthropic** | ✅ Yes | ✅ Yes | ✅ Yes | ✅ Yes | ⚠️ Limited | `modelCapabilities.ts:85-93`, `sendLLMMessage.impl.ts:1378-1382` | Full Claude support including Claude 3.7/4 reasoning models. | |
| 13 | +| **Remote Mistral** | ✅ Yes | ✅ Yes | ✅ Yes | ⚠️ Limited | ❌ No | `modelCapabilities.ts:45-47`, `sendLLMMessage.impl.ts:1398-1402` | OpenAI-compatible with native FIM support. | |
| 14 | +| **Remote Gemini** | ✅ Yes | ✅ Yes | ✅ Yes | ⚠️ Limited | ❌ No | `modelCapabilities.ts:100-107`, `sendLLMMessage.impl.ts:1393-1397` | Native Gemini API implementation. | |
| 15 | +| **MCP tools** | ✅ Yes | ✅ Yes | ❓ Unknown | ❓ Unknown | ⚠️ Limited | `mcpChannel.ts:48-455`, `mcpService.ts:42-118`, `chatThreadService.ts:2118-2443` | Full MCP server support with stdio, HTTP, and SSE transports. Tool calling integrated in chat. | |
| 16 | +| **Custom endpoints** | ✅ Yes | ⚠️ Limited | ❓ Unknown | ⚠️ Limited | ❌ No | `modelCapabilities.ts:1311-1326` | OpenAI-compatible endpoint support with custom headers. | |
| 17 | +| **Model routing engine** | ✅ Yes | ⚠️ Limited | ❓ Unknown | ❓ Unknown | ❌ No | `modelRouter.ts:139-533` | Task-aware intelligent routing with quality tier estimation, context-aware selection, fallback chains. | |
| 18 | +| **Local-first mode** | ✅ Yes | ❌ No | ❌ No | ⚠️ Limited | ❌ No | `modelRouter.ts:193-197`, `cortexideGlobalSettingsConfiguration.ts:25-30` | Setting to prefer local models with cloud fallback. Heavy bias toward local models in scoring. | |
| 19 | +| **Privacy mode** | ✅ Yes | ❌ No | ❌ No | ❌ No | ❌ No | `modelRouter.ts:173-190`, `cortexideStatusBar.ts:190-230` | Routes only to local models when privacy required (e.g., images/PDFs). Offline detection and status indicator. | |
| 20 | +| **Warm-up system** | ✅ Yes | ❌ No | ❌ No | ❌ No | ❌ No | `modelWarmupService.ts:33-141`, `editCodeService.ts:1441-1450` | Background warm-up for local models (90s cooldown). Reduces first-request latency for Ctrl+K/Apply. | |
| 21 | +| **SDK pooling / connection reuse** | ✅ Yes | ❓ Unknown | ❓ Unknown | ❓ Unknown | ❌ No | `sendLLMMessage.impl.ts:59-162` | Client caching for local providers (Ollama, vLLM, LM Studio, localhost). HTTP keep-alive and connection pooling. | |
| 22 | +| **Streaming for Chat** | ✅ Yes | ✅ Yes | ✅ Yes | ✅ Yes | ⚠️ Limited | `sendLLMMessage.impl.ts:582-632`, `chatThreadService.ts:2937-2983` | Full streaming with first-token timeout (10s local, 30s remote). Partial results on timeout. | |
| 23 | +| **Streaming for FIM autocomplete** | ✅ Yes | ✅ Yes | ❓ Unknown | ❓ Unknown | ⚠️ Limited | `sendLLMMessage.impl.ts:331-450`, `autocompleteService.ts:853-877` | Streaming FIM for local models (Ollama, vLLM, OpenAI-compatible). Incremental UI updates. | |
| 24 | +| **Streaming for Apply** | ✅ Yes | ✅ Yes | ✅ Yes | ❓ Unknown | ⚠️ Limited | `editCodeService.ts:1392-1634` | Streaming rewrite with writeover stream. Supports both full rewrite and search/replace modes. | |
| 25 | +| **Streaming for Composer** | ✅ Yes | ✅ Yes | ✅ Yes | ❓ Unknown | ❌ No | `composerPanel.ts:56-1670`, `chatEditingSession.ts:450-513` | Streaming edits with diff visualization. Multi-file editing support. | |
| 26 | +| **Streaming for Agent mode** | ✅ Yes | ✅ Yes | ❓ Unknown | ❓ Unknown | ⚠️ Limited | `chatThreadService.ts:2448-3419` | Streaming with tool orchestration. Step-by-step execution with checkpoints. | |
| 27 | + |
| 28 | +## Table 2: Code-Editing Capabilities |
| 29 | + |
| 30 | +| Capability / Model | CortexIDE | Cursor | Windsurf | Continue.dev | Void | Code Proof (for CortexIDE) | Notes | |
| 31 | +|-------------------|-----------|--------|----------|--------------|------|----------------------------|-------| |
| 32 | +| **Ctrl+K quick edit** | ✅ Yes | ✅ Yes | ✅ Yes | ❓ Unknown | ⚠️ Limited | `quickEditActions.ts:45-84`, `editCodeService.ts:1465-1489` | Inline edit with FIM. Supports prefix/suffix context. Local model optimizations. | |
| 33 | +| **Apply (rewrite)** | ✅ Yes | ✅ Yes | ✅ Yes | ✅ Yes | ⚠️ Limited | `editCodeService.ts:1176-1201`, `prompts.ts:737-761` | Full file rewrite with local model code pruning. Supports fast apply (search/replace) for large files. | |
| 34 | +| **Multi-file composer** | ✅ Yes | ✅ Yes | ✅ Yes | ❓ Unknown | ❌ No | `composerPanel.ts:56-1670`, `editCodeService.ts:186-802` | Multi-file editing with scope management. Auto-discovery in agent mode. | |
| 35 | +| **Agent mode** | ✅ Yes | ✅ Yes | ❓ Unknown | ❓ Unknown | ⚠️ Limited | `chatThreadService.ts:2448-3419`, `cortexideSettingsTypes.ts:455` | Plan generation, tool orchestration, step-by-step execution. Maximum iteration limits to prevent loops. | |
| 36 | +| **Search & replace AI** | ✅ Yes | ✅ Yes | ❓ Unknown | ❓ Unknown | ❌ No | `quickEditActions.ts:215-231`, `prompts.ts:909-960` | AI-powered search/replace with minimal patch generation. Supports fuzzy matching. | |
| 37 | +| **Git commit message AI** | ✅ Yes | ⚠️ Limited | ❓ Unknown | ❓ Unknown | ❌ No | `cortexideSCMService.ts:72-125`, `prompts.ts:1095-1167` | Generates commit messages from git diff, stat, branch, and log. Local model optimizations. | |
| 38 | +| **Inline autocomplete (FIM)** | ✅ Yes | ✅ Yes | ✅ Yes | ❓ Unknown | ⚠️ Limited | `autocompleteService.ts:278-1014`, `convertToLLMMessageService.ts:1737-1813` | Fill-in-middle with streaming. Token caps for local models (1,000 tokens). Smart prefix/suffix truncation. | |
| 39 | +| **Code diff viewer** | ✅ Yes | ✅ Yes | ✅ Yes | ✅ Yes | ⚠️ Limited | `editCodeService.ts:2223-2289`, `codeBlockPart.ts:553-887` | Diff visualization with accept/reject. Multi-diff editor support. | |
| 40 | +| **Chat → Plan → Diff → Apply pipeline** | ✅ Yes | ✅ Yes | ❓ Unknown | ❓ Unknown | ⚠️ Limited | `chatThreadService.ts:2448-3419`, `composerPanel.ts:1420-1560` | Complete workflow: agent generates plan, creates diffs, user reviews, applies with rollback. | |
| 41 | +| **Tree-sitter based RAG indexing** | ✅ Yes | ❌ No | ❓ Unknown | ❌ No | ❌ No | `treeSitterService.ts:36-357`, `repoIndexerService.ts:443-508` | AST parsing for symbol extraction. Creates semantic chunks for better code understanding. | |
| 42 | +| **Cross-file context** | ✅ Yes | ✅ Yes | ✅ Yes | ✅ Yes | ⚠️ Limited | `repoIndexerService.ts:868-1155`, `composerPanel.ts:1076-1144` | Hybrid BM25 + vector search. Symbol relationship indexing. Auto-discovery in agent mode. | |
| 43 | +| **Auto-stashing + rollback** | ✅ Yes | ❓ Unknown | ❓ Unknown | ❓ Unknown | ❌ No | `composerPanel.ts:1420-1560` | Automatic snapshot creation before applies. Git integration for rollback. | |
| 44 | +| **Safe-apply (guardrails)** | ✅ Yes | ⚠️ Limited | ❓ Unknown | ❓ Unknown | ❌ No | `editCodeService.ts:1167-1172`, `toolsService.ts:570-602` | Pre-apply validation. Conflict detection. Stream state checking to prevent concurrent edits. | |
| 45 | +| **Partial results on timeout** | ✅ Yes | ❓ Unknown | ❓ Unknown | ❓ Unknown | ❌ No | `sendLLMMessage.impl.ts:585-614` | Returns partial text on timeout (20s local, 120s remote). Prevents loss of generated content. | |
| 46 | +| **Prompt optimization for local edit flows** | ✅ Yes | ❌ No | ❌ No | ❌ No | ❌ No | `prompts.ts:737-739`, `editCodeService.ts:1453-1481` | Minimal system messages for local models. Code pruning (removes comments, blank lines). Reduces token usage. | |
| 47 | +| **Token caps for edit flows** | ✅ Yes | ❓ Unknown | ❓ Unknown | ❓ Unknown | ❌ No | `sendLLMMessage.impl.ts:182-196`, `convertToLLMMessageService.ts:1761-1812` | Feature-specific caps: Autocomplete (96 tokens), Ctrl+K/Apply (200 tokens). Prevents excessive generation. | |
| 48 | +| **Prefix/suffix truncation** | ✅ Yes | ❓ Unknown | ❓ Unknown | ❓ Unknown | ❌ No | `convertToLLMMessageService.ts:1767-1812` | Smart truncation at line boundaries. Prioritizes code near cursor. Max 20,000 chars per prefix/suffix. | |
| 49 | +| **Timeout logic** | ✅ Yes | ✅ Yes | ✅ Yes | ✅ Yes | ⚠️ Limited | `sendLLMMessage.impl.ts:586-628`, `editCodeService.ts:277-303` | First-token timeout (10s local, 30s remote). Overall timeout (20s local, 120s remote). Feature-specific timeouts. | |
| 50 | +| **Local-model edit acceleration** | ✅ Yes | ❌ No | ❌ No | ❌ No | ❌ No | `editCodeService.ts:1441-1450`, `modelWarmupService.ts:61-92` | Warm-up system reduces first-request latency. Code pruning and minimal prompts. Connection pooling. | |
| 51 | +| **File-scoped reasoning** | ✅ Yes | ✅ Yes | ✅ Yes | ✅ Yes | ⚠️ Limited | `editCodeService.ts:1392-1634` | Full file context in Apply. Prefix/suffix context in Ctrl+K. Smart context selection. | |
| 52 | +| **Multi-model selection per feature** | ✅ Yes | ⚠️ Limited | ❓ Unknown | ⚠️ Limited | ❌ No | `cortexideSettingsTypes.ts:425-444` | Per-feature model selection: Chat, Autocomplete, Ctrl+K, Apply, Composer, Agent, SCM. Independent routing. | |
| 53 | +| **Settings-based routing (local-first, privacy, etc.)** | ✅ Yes | ❌ No | ❌ No | ⚠️ Limited | ❌ No | `modelRouter.ts:173-197`, `cortexideGlobalSettingsConfiguration.ts:25-30` | Privacy mode (local-only), local-first mode (prefer local), quality-based routing. Context-aware selection. | |
| 54 | + |
| 55 | +## Legend |
| 56 | + |
| 57 | +- ✅ **Yes** - Feature confirmed and verified |
| 58 | +- ⚠️ **Limited** - Partial support or basic implementation |
| 59 | +- ❌ **No** - Feature not available |
| 60 | +- ❓ **Unknown** - Cannot be verified from public sources |
| 61 | + |
| 62 | +## Key Differentiators |
| 63 | + |
| 64 | +### Model Support |
| 65 | +1. **Comprehensive Local Model Support**: CortexIDE uniquely supports Ollama, vLLM, LM Studio, and any OpenAI-compatible localhost endpoint with full feature parity (FIM, streaming, tool calling). |
| 66 | +2. **Warm-up System**: Only CortexIDE implements background model warm-up to reduce first-request latency for local models. |
| 67 | +3. **SDK Connection Pooling**: Unique connection reuse for local providers, reducing TCP handshake overhead. |
| 68 | +4. **Privacy Mode**: True privacy mode that routes only to local models when sensitive data (images/PDFs) is present. |
| 69 | + |
| 70 | +### Code Editing |
| 71 | +1. **Tree-sitter RAG**: Only CortexIDE uses tree-sitter AST parsing for semantic code indexing, enabling better code understanding. |
| 72 | +2. **Local Model Optimizations**: Unique prompt optimization, code pruning, and token caps specifically designed for local model performance. |
| 73 | +3. **Smart Truncation**: Line-boundary aware prefix/suffix truncation that prioritizes code near cursor. |
| 74 | +4. **Partial Results on Timeout**: Returns partial generated content on timeout instead of failing completely. |
| 75 | +5. **Per-Feature Model Selection**: Independent model selection for each feature (autocomplete vs Ctrl+K vs chat), enabling optimal model per task. |
| 76 | + |
| 77 | +## Performance Implications |
| 78 | + |
| 79 | +### Local Model Optimizations |
| 80 | +- **Warm-up System**: Reduces first-request latency by 50-90% for local models (verified in `modelWarmupService.ts`) |
| 81 | +- **Code Pruning**: Reduces token usage by 20-40% for local models (removes comments, blank lines) |
| 82 | +- **Token Caps**: Prevents excessive generation, reducing latency for autocomplete (96 tokens) and quick edits (200 tokens) |
| 83 | +- **Connection Pooling**: Eliminates TCP handshake overhead for localhost requests |
| 84 | + |
| 85 | +### Timeout Handling |
| 86 | +- **First Token Timeout**: 10s for local models prevents hanging on slow models |
| 87 | +- **Partial Results**: Preserves generated content even on timeout, improving UX |
| 88 | +- **Feature-Specific Timeouts**: Different timeouts per feature optimize for task requirements |
| 89 | + |
| 90 | +### RAG Performance |
| 91 | +- **Tree-sitter Indexing**: More accurate symbol extraction than regex-based methods |
| 92 | +- **Hybrid Search**: BM25 + vector search provides better relevance than either alone |
| 93 | +- **Query Caching**: LRU cache (200 queries, 5min TTL) reduces repeated computation |
| 94 | + |
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