Model Comparison
Fable 5.1 vs GPT 5.3 Codex
Fable 5.1 ranks #5 on the AI IQ leaderboard with an estimated IQ of 137, while GPT 5.3 Codex ranks #66 on the AI IQ leaderboard with an estimated IQ of 112. The table below puts the two models side by side across the seven capability dimensions, emotional reasoning, cost, speed, and context window.
Where They Sit on the IQ Bell Curve
Both models highlighted on the standard normal IQ distribution of every tracked model
| Fable 5.1Anthropic | GPT 5.3 CodexOpenAI | |
|---|---|---|
| Rank | #5 | #66 |
| IQ | 137 | 112 |
| Abstract Reasoning | 124 | 84 |
| Mathematical Reasoning | 147 | 103 |
| Academic Reasoning | 136 | 129 |
| Programmatic Reasoning | 146 | 124 |
| Computer Use | 142 | 113 |
| Reliability | 135 | 115 |
| Knowledge Work | 132 | 113 |
| Emotional Reasoning | — | — |
| Effective Cost / 1M Tokens | $90.23 | $18.57 |
| Sticker Price / 1M I/O Tokens | $60.00 | $15.75 |
| Speed | 68 tok/s | 83 tok/s |
| Context Window | 1M | 400K |
| Released | 2026-09-01 | 2026-02-05 |
| Open Weights | No | No |
More comparisons
- Fable 5.1 vs Deepseek V4 Pro
- Fable 5.1 vs Gemini 4 Argon
- Fable 5.1 vs Glm 5.3
- Fable 5.1 vs GPT 6 Astra
- Fable 5.1 vs Grok 4.7
- Fable 5.1 vs Kimi K3
- Fable 5.1 vs Mimo V2.6 Pro
- Fable 5.1 vs Minimax M3
- Fable 5.1 vs Muse Wonder Full
- Fable 5.1 vs Qwen3.8 Max 0902
- GPT 5.3 Codex vs Deepseek V4 Pro
- GPT 5.3 Codex vs Gemini 4 Argon
- GPT 5.3 Codex vs Glm 5.3
- GPT 5.3 Codex vs GPT 6 Astra
- GPT 5.3 Codex vs Grok 4.7
- GPT 5.3 Codex vs Kimi K3
- All comparisons