Grok 4.20 vs Mistral Medium 3.5

Grok 4.20 costs 17% less on input and 67% less on output than Mistral Medium 3.5 ($1.25 / $2.50 versus $1.50 / $7.50 per million tokens). Grok 4.20 accepts more context (2 M). On capabilities, Grok 4.20 has a reasoning mode. Mistral Medium 3.5 offers a batch tier at half price for jobs that do not need an immediate answer.

Grok 4.20 is cheaper: $1.25 per million input tokens and $2.50 per million output tokens, versus $1.50 / $7.50 for Mistral Medium 3.5.

Grok 4.20 accepts 2 M tokens of context; Mistral Medium 3.5 accepts 262 K.

Mistral Medium 3.5 was released on 05/01/2026; Grok 4.20 on 03/31/2026.

With 1,500 input and 400 output tokens per request: Grok 4.20: $28.75; Mistral Medium 3.5: $52.50 a month, at list price.

From the public catalogs of OpenRouter, models.dev and LiteLLM, which publish each provider's list prices. They sync once a day and the last update date is shown above the comparison.

It is what the provider charges per million tokens you send (input) or the model generates (output). A token is roughly 4 characters. Output almost always costs more than input.