OpenAI: GPT-5.4 wins on more metrics (5 of 9), but the right pick depends on what you optimize for — see the breakdown below.
| Metric | Anthropic: Claude Fable 5 | OpenAI: GPT-5.4 |
|---|---|---|
| Intelligence Index | 64.9✓ | 56.8 |
| Coding Index | 62.0✓ | 57.2 |
| GPQA Diamond | 93%✓ | 92% |
| Design Arena Elo | 1417✓ | 1303 |
| Speed (tokens/sec) | — | 62✓ |
| Latency | — | 982ms✓ |
| Input price /M | $10.00 | $2.50✓ |
| Output price /M | $50.00 | $15.00✓ |
| Context window | 1M | 1.1M✓ |
| Capabilities | ReasoningToolsJSONVision | ReasoningToolsJSONVision |