Claude Fable 5.1 vs Grok 4.20 (Reasoning): API price and specs

Grok 4.20 (Reasoning) is 80% cheaper than Claude Fable 5.1 on input price.

Grok 4.20 (Reasoning) is 92% cheaper than Claude Fable 5.1 on output price.

Grok 4.20 (Reasoning) is 86% cheaper than Claude Fable 5.1 on a 1M-in / 200k-out workload.

Grok 4.20 (Reasoning) has a 100% larger context than Claude Fable 5.1.

Field	Claude Fable 5.1	Grok 4.20 (Reasoning)
Lowest input, per 1M	$5.00 +400%	$1.00
Median input, per 1M	$10.00 +700%	$1.25
Lowest output, per 1M	$25.00 +1150%	$2.00
Median output, per 1M	$50.00 +1900%	$2.50
Lowest unit price	—	—
Cost of 1M in + 200k out	$10.00 +614.3%	$1.40
Context	1M +50%	2M
Max output	128K +93.6%	2M
Providers	30	10 +66.7%
Regions	EU, GLOBAL, US	US
Accepts	application/pdf, file, image, image/gif, image/jpeg, image/png, image/webp, pdf, text	image, pdf, text
Returns	text	text
Type	Text models	Text models
Free option	no	no
Cheapest provider	iteracompute	vercel

Your own workload: how many tokens the model gets (input) and gives back (output) - for example, in a month. The "Cost" row of the table above is recalculated for these numbers, for each model.

Computed from current offers each time the page opens; the best value of a row is bold, the percent is how far behind the best.

Providers selling both

aihubmix, aiml, azure, edenai, google-vertex, impossibl, jiekou, trustedrouter, vercel

Frequently asked questions

Which is cheaper, Claude Fable 5.1 or Grok 4.20 (Reasoning)?

Grok 4.20 (Reasoning) is 80% cheaper than Claude Fable 5.1 on input price. Grok 4.20 (Reasoning) is 92% cheaper than Claude Fable 5.1 on output price. Grok 4.20 (Reasoning) is 86% cheaper than Claude Fable 5.1 on a 1M-in / 200k-out workload.

Which has the larger context, Claude Fable 5.1 or Grok 4.20 (Reasoning)?

Claude Fable 5.1: 1M tokens; Grok 4.20 (Reasoning): 2M tokens.

Where can I use both Claude Fable 5.1 and Grok 4.20 (Reasoning)?

aihubmix, aiml, azure, edenai, google-vertex, impossibl, jiekou, trustedrouter, vercel