Claude Fable 5 vs Gemini 3.8 Flash
Claude Fable 5 (Anthropic) and Gemini 3.8 Flash (Google) compared on price, context window, speed and independent benchmarks. Claude Fable 5 scores higher on the Artificial Analysis Intelligence Index (62.1 vs 58.7), while Gemini 3.8 Flash is 13.3× cheaper on a blended basis. Pick Claude Fable 5 for the hardest tasks and Gemini 3.8 Flash when cost dominates.
| Claude Fable 5 | Gemini 3.8 Flash | |
|---|---|---|
| Provider | Anthropic | |
| Input $/1M | $10.0 | $0.75 |
| Output $/1M | $50.0 | $3.75 |
| Blended $/1M (3:1) | $20.0 | $1.50 |
| Cached input $/1M | $1.00 | $0.07 |
| Context window | 1M | 1.0M |
| Knowledge cutoff | 2026-01 | — |
| License | proprietary | proprietary |
| Speed (tok/s) | 68 | 417 |
| Artificial Analysis Intelligence Index | 62.1 | 58.7 |
| LMArena Elo | 1494 | — |
| GPQA Diamond | 92.6% | 95.3% |
| AIME | 99.7%* | — |
| SWE-bench Verified | 95% | — |
| MMLU-Pro | 91.5%* | — |
| Humanity's Last Exam | 55.5% | 47.8% |