xAI

Grok 4.20 (Reasoning)

Type
language model
Context
2,000K tokens
Max output
30K
Released
9 March 2026
API string
grok-4-20-beta-0309-reasoning

Prices by provider

Provider Input, $ per 1M Output, $ per 1M In our data since
302.AI $2 $6 31 Jul 2026
LLM Gateway $2 $6 31 Jul 2026
xAI $2 $6 31 Jul 2026

Only the base tier and only per-token prices are shown. Batch, discounted and cached rates, as well as prices per image or per second of video, do not go into this table: they cannot stand in the same column as a price per million tokens.

The date in the last column is the day this price first entered our collection. The price may well be older: before that day we simply were not recording it. It has not changed since — otherwise a new row with a new date would stand in its place.

Measurement results

Task set Result Run conditions Measured by
Arena Score in French 1,477.38 1,462–1,493
Arena Score in Russian 1,460.08 1,452–1,468
Arena Score, programming 1,458.81 1,453–1,465
Arena Score in English 1,457.27 1,452–1,462
Arena Score, mathematics 1,457.07 1,446–1,468
Arena Score, multi-turn dialogue 1,456.81 1,450–1,464
Arena Score, hard prompts 1,451.85 1,447–1,456
Arena Score, overall 1,451.73 1,448–1,456
Arena Score in Spanish 1,448.44 1,433–1,464
Arena Score, expert questions 1,439.3 1,431–1,448
Arena Score, long queries 1,437.5 1,432–1,443
Arena Score, creative writing 1,433.4 1,426–1,440
Arena Score, instruction following 1,419.91 1,414–1,425
Arena Score, web development 1,373.68 1,367–1,380
Arena Score, understanding diagrams 1,265.18 1,256–1,274
Arena Score, text recognition in images 1,262.72 1,256–1,269
Arena Score, working with images 1,261.56 1,255–1,268