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Claude Fable 5.1 vs Gemini 3.8 Flash

Claude Fable 5.1Anthropic
Gemini 3.8 FlashGoogle
Our take

Claude Fable 5.1 wins 4 of 4 categories, but Gemini 3.8 Flash is 13.3× cheaper for everyday text work. Pick Claude Fable 5.1 when quality matters most, Gemini 3.8 Flash at volume.

Overall92Best71
Coding89Best66
Writing90Best80
Support83Best78
Value73Best66
Input / 1M$10.00$0.75Best
Output / 1M$50.00$3.75Best
Blended / 1M$20.00$1.50Best
Context window1M1MBest
Open weightsNoNo
Released1 Sept 20262 Sept 2026

Your monthly bill

50k
Claude Fable 5.1$4.0k
Gemini 3.8 Flash$300Cheapest
List prices, a quarter of the tokens as output. Scores are provisional, from Arena and Epoch AI.