Anthropic: Claude Fable 5.1 vs Google: Gemini 3.1 Pro Preview Custom Tools — pricing compared

Side-by-side API pricing for Anthropic: Claude Fable 5.1 and Google: Gemini 3.1 Pro Preview Custom Tools, normalized to $/1M tokens from the live OpenRouter feed.

Token Price Index › Browse › Anthropic: Claude Fable 5.1 vs Google: Gemini 3.1 Pro Preview Custom Tools

On blended cost, Google: Gemini 3.1 Pro Preview Custom Tools ($4.50/M) is about 78% cheaper than Anthropic: Claude Fable 5.1 ($20.00/M) per 1M tokens. Google: Gemini 3.1 Pro Preview Custom Tools wins on input price, Google: Gemini 3.1 Pro Preview Custom Tools on output, and Google: Gemini 3.1 Pro Preview Custom Tools has the larger context window.

Subscribe — $9/mo
Anthropic: Claude Fable 5.1 pricingGoogle: Gemini 3.1 Pro Preview Custom Tools pricingBrowse all
ModelContextInput $/MOutput $/MBlended $/M
Anthropic: Claude Fable 5.1visioncache
anthropic
1,000,000$10.00/M$50.00/M$20.00/M
Google: Gemini 3.1 Pro Preview Custom Toolsvisioncache
google
1,048,576$2.00/M$12.00/M$4.50/M

Frequently asked questions

Is Anthropic: Claude Fable 5.1 or Google: Gemini 3.1 Pro Preview Custom Tools cheaper?
On a blended basis Google: Gemini 3.1 Pro Preview Custom Tools is cheaper at $4.50/M per 1M tokens versus $20.00/M for Anthropic: Claude Fable 5.1 — about 78% less. Blended weights input 3:1 over output.
Anthropic: Claude Fable 5.1 vs Google: Gemini 3.1 Pro Preview Custom Tools: input token cost?
Anthropic: Claude Fable 5.1 charges $10.00/M per 1M input tokens; Google: Gemini 3.1 Pro Preview Custom Tools charges $2.00/M. Google: Gemini 3.1 Pro Preview Custom Tools is cheaper on input.
Anthropic: Claude Fable 5.1 vs Google: Gemini 3.1 Pro Preview Custom Tools: output token cost?
Anthropic: Claude Fable 5.1 charges $50.00/M per 1M output tokens; Google: Gemini 3.1 Pro Preview Custom Tools charges $12.00/M. Google: Gemini 3.1 Pro Preview Custom Tools is cheaper on output.
Which has the larger context window, Anthropic: Claude Fable 5.1 or Google: Gemini 3.1 Pro Preview Custom Tools?
Anthropic: Claude Fable 5.1 supports 1,000,000 tokens and Google: Gemini 3.1 Pro Preview Custom Tools supports 1,048,576 tokens, so Google: Gemini 3.1 Pro Preview Custom Tools handles longer inputs in a single call.
How do I track Anthropic: Claude Fable 5.1 and Google: Gemini 3.1 Pro Preview Custom Tools price changes?
Token Price Index Pro ($9/mo) emails you the instant either model changes price, so a hike never catches you out.

Get price-drop alerts for models you use

$9/mo · cancel anytime

Pro subscribers get emailed the instant a model they track drops in price, plus a weekly cheapest-per-task digest and full CSV/JSON export.

Subscribe — $9/mo
Data: OpenRouter public model API, normalized to $/1M tokens. Blended = (3×input + output)/4. Generated 19 Oct 2026 22:00 UTC. Prices change often — confirm on the provider before committing spend.