Is Claude Fable 5.1 or Gemini 3.8 Flash cheaper?

Gemini 3.8 Flash is cheaper for a typical request of 1,000 input and 500 output tokens: $0.002625 versus $0.035 for Claude Fable 5.1, about 93% less.

What are the per-token prices of Claude Fable 5.1 and Gemini 3.8 Flash?

Claude Fable 5.1 costs $10.00 input and $50.00 output per million tokens. Gemini 3.8 Flash costs $0.75 input and $3.75 output per million tokens.

Which has the larger context window, Claude Fable 5.1 or Gemini 3.8 Flash?

Gemini 3.8 Flash has the larger context window: 1.05M tokens versus 1M for Claude Fable 5.1.

Anthropic vs Google

Claude Fable 5.1 vs Gemini 3.8 Flash: pricing comparison

Gemini 3.8 Flash costs 13.3× less than Claude Fable 5.1 for a typical 1,000-input, 500-output request. Here is how the two compare on price, context and discounts.

Prices last updated: September 25, 2026

	Claude Fable 5.1	Gemini 3.8 Flash
Provider	Anthropic	Google
Input per 1M tokens	$10.00	$0.75
Output per 1M tokens	$50.00	$3.75
Context window	1M	1.05M
Batch discount	50% off	50% off
Typical request (1,000 in / 500 out)	$0.035	$0.002625
Monthly at 1,000 requests/day	$1,050.00	$78.75

Claude Fable 5.1: Anthropic's most capable widely released model.

Gemini 3.8 Flash: Promotional rate through 31 December 2026; scheduled to rise to $1.50 / $7.50.

Compare with your own numbers

Input tokens

Output tokens

Requests / day

Claude Fable 5.1 per request: $0.035
Per month: $1,050.00

Gemini 3.8 Flash per request: $0.002625
Per month: $78.75

Cost by task

Cost per 1,000 requests at standard prices.
Task	Tokens (in / out)	Claude Fable 5.1	Gemini 3.8 Flash
Short chat reply	500 / 300	$20.00	$1.50
RAG answer	6,000 / 600	$90.00	$6.75
Summarize a long document	12,000 / 1,000	$170.00	$12.75
Output-heavy generation	1,000 / 4,000	$210.00	$15.75

Output tokens usually dominate the bill — see input vs output token cost.

Frequently asked questions

Is Claude Fable 5.1 or Gemini 3.8 Flash cheaper?: Gemini 3.8 Flash is cheaper for a typical request of 1,000 input and 500 output tokens: $0.002625 versus $0.035 for Claude Fable 5.1, about 93% less.
What are the per-token prices of Claude Fable 5.1 and Gemini 3.8 Flash?: Claude Fable 5.1 costs $10.00 input and $50.00 output per million tokens. Gemini 3.8 Flash costs $0.75 input and $3.75 output per million tokens.
Which has the larger context window, Claude Fable 5.1 or Gemini 3.8 Flash?: Gemini 3.8 Flash has the larger context window: 1.05M tokens versus 1M for Claude Fable 5.1.

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