Codex vs Claude Code vs Gemini Code Assist: 2026 Savaşı

1┌─────────────────────────────────────────────────────────┐
2│                    CODEX(OpenAI)                        │
3│  ChatGPT → Cloud Sandbox(microVM) → GitHub PR          │
4│  [Izole]  [Otonom]  [Network kisitli]                   │
5└─────────────────────────────────────────────────────────┘
6 
7┌─────────────────────────────────────────────────────────┐
8│                  CLAUDE CODE(Anthropic)                  │
9│  Terminal → Local Dosya Sistemi → Git Commit             │
10│  [Interaktif]  [Tam erisim]  [MCP Plugins]              │
11└─────────────────────────────────────────────────────────┘
12 
13┌─────────────────────────────────────────────────────────┐
14│              GEMINI CODE ASSIST(Google)                  │
15│  IDE(VS Code/JetBrains) → Local + Cloud → Suggestion    │
16│  [Inline]  [Vertex AI backend]  [Google Cloud]          │
17└─────────────────────────────────────────────────────────┘

1// Kavramsal karsilastirma — guclu oldugu alanlar (10 uzerinden)
2interface ModelStrengths {
3  codeGeneration: number;
4  codeReasoning: number;
5  debugging: number;
6  refactoring: number;
7  testWriting: number;
8  documentation: number;
9  multiFileEditing: number;
10  contextUnderstanding: number;
11}
12 
13const strengths: Record = {
14  codex: {
15    codeGeneration: 9,
16    codeReasoning: 9,
17    debugging: 8,
18    refactoring: 8,
19    testWriting: 9,
20    documentation: 7,
21    multiFileEditing: 9,
22    contextUnderstanding: 8,
23  },
24  claudeCode: {
25    codeGeneration: 9,
26    codeReasoning: 10,
27    debugging: 9,
28    refactoring: 9,
29    testWriting: 8,
30    documentation: 9,
31    multiFileEditing: 9,
32    contextUnderstanding: 10,
33  },
34  geminiCA: {
35    codeGeneration: 8,
36    codeReasoning: 9,
37    debugging: 8,
38    refactoring: 8,
39    testWriting: 7,
40    documentation: 8,
41    multiFileEditing: 7,
42    contextUnderstanding: 9,
43  },
44};

1Language       | Codex  | Claude | Gemini
2─────────────────────────────────────────
3Python         | 95.1%  | 96.3%  | 94.2%
4TypeScript     | 93.8%  | 95.1%  | 91.5%
5Swift          | 87.2%  | 90.4%  | 83.1%
6Kotlin         | 86.5%  | 88.9%  | 85.3%
7Rust           | 82.1%  | 85.6%  | 79.4%
8Go             | 88.7%  | 89.2%  | 87.1%
9C++            | 84.3%  | 86.1%  | 82.8%

1// Aylik maliyet tahmini — Orta olcekli takim (5 gelistirici)
2 
3interface MonthlyCost {
4  tool: string;
5  baseCost: number;
6  apiUsage: number;
7  total: number;
8  perDeveloper: number;
9}
10 
11const costEstimates: MonthlyCost[] = [
12  {
13    tool: 'Codex (ChatGPT Pro x5)',
14    baseCost: 200 * 5,    // $200/kisi
15    apiUsage: 0,           // Dahil
16    total: 1000,
17    perDeveloper: 200,
18  },
19  {
20    tool: 'Claude Code (API)',
21    baseCost: 0,
22    apiUsage: 150 * 5,    // ~$150/kisi (agir kullanim)
23    total: 750,
24    perDeveloper: 150,
25  },
26  {
27    tool: 'Gemini Code Assist Enterprise',
28    baseCost: 19 * 5,     // $19/kisi
29    apiUsage: 200,         // Vertex AI ek kullanim
30    total: 295,
31    perDeveloper: 59,
32  },
33];

1Level 0: Manual coding(AI yok)
2Level 1: Autocomplete(Copilot tab completion)
3Level 2: Chat-based assistance(ChatGPT'ye sorma)
4Level 3: Interactive agent(Claude Code — beraber calisma)
5Level 4: Supervised autonomy(Codex — gorevi ver, kontrol et)
6Level 5: Full autonomy(henuz yok — insansiz deployment)
7 
8Codex:         ████████░░ Level 4
9Claude Code:   ███████░░░ Level 3-4
10Gemini CA:     █████░░░░░ Level 2-3

1// Her aracin ekosistem avantajlari
2const ecosystem = {
3  codex: {
4    strengths: [
5      'GitHub derin entegrasyon (PR, issue, actions)',
6      'ChatGPT Plus/Pro ile sinirsiz kullanim',
7      'Paralel gorev yurutme',
8      'DALL-E, browser, code interpreter ile birlesik',
9    ],
10    weaknesses: [
11      'IDE icinde degil, ayri arayuz',
12      'Local dosya erisimi yok',
13      'Offline calisma yok',
14    ],
15  },
16  claudeCode: {
17    strengths: [
18      'MCP ile sinirsiz plugin (Playwright, Firebase, Context7...)',
19      'Multi-agent teams (paralel calisma)',
20      'Hooks sistemi (pre/post command otomasyonu)',
21      'Local dosya sistemi tam erisim',
22      'Terminal-native (zsh/bash)',
23    ],
24    weaknesses: [
25      'API maliyeti degisken',
26      'GUI yok (terminal-only)',
27      'Bulut izolasyon yok (lokal risk)',
28    ],
29  },
30  geminiCA: {
31    strengths: [
32      'Google Cloud nativ entegrasyon',
33      'Firebase, BigQuery, Cloud Run ile seamless',
34      '2M token context (dev repo anlama)',
35      'Ucret/performans orani en iyi',
36      'IDE icinde kalma deneyimi',
37    ],
38    weaknesses: [
39      'Otonom seviye dusuk',
40      'Multi-file editing sinirli',
41      'Plugin ekosistemi zayif',
42    ],
43  },
44};