Grok 4.20 (Reasoning)

xai/grok-4.20-0309-reasoning

Maker: xAI, United States
Released: 2026-03-09
Family: grok
Weights: closed
Tasks: text.chat, text.reasoning, code, vision.understand, vision.extract
Cheapest offering: Google Vertex AI, about $0.002 for a typical text.chat call

Try it in the sandbox Use it from the API

Offerings

Provider	Model id at the provider	Status	Price per 1M tokens	Per-unit prices	Limits	Capabilities (level)
Google Vertex AI	`xai/grok-4.20-reasoning`	ga	Input: $1.25 Output: $2.5 Cache read: $0.2 Input, prompts over 200,000 tokens: $2.5 Output, prompts over 200,000 tokens: $5 Cache read, prompts over 200,000 tokens: $0.4 Since 2026-11-03 · models.dev, MIT	none	Context: 2,000,000 tokens Max output: 30,000 tokens	`input.text` claimed `input.image` claimed `input.pdf` claimed `output.text` claimed `tools` claimed `structured_output` claimed `reasoning` claimed `tool_choice` claimed `prompt_caching` claimed `web_search` claimed
xAI	`grok-4.20-0309-reasoning`	ga	Input: $1.25 Output: $2.5 Cache read: $0.2 Input, prompts over 200,000 tokens: $2.5 Output, prompts over 200,000 tokens: $5 Cache read, prompts over 200,000 tokens: $0.4 Unverified: sources disagree by more than 5%Since 2026-11-03 · models.dev, MIT	none	Context: 1,000,000 tokens Max output: 30,000 tokens	`input.text` claimed `input.image` claimed `input.pdf` claimed `output.text` claimed `tools` claimed `structured_output` claimed `reasoning` claimed `tool_choice` claimed `prompt_caching` claimed `web_search` claimed

Quality scores

Basis	Score (0–1)	Raw	Measured	Source
`epoch:gpqa_diamond`	0.927	0.8933	2026-07-13	Epoch AI, CC-BY-4.0, normalized by Nanner Tech
`epoch:frontiermath`	0.479	0.4491	2026-07-13	Epoch AI, CC-BY-4.0, normalized by Nanner Tech

Aliases

Other names the API accepts for this model.

grok-4.20-0309-reasoning
xai/grok-4.20-reasoning

Use it from the API

Look this model up, or ask for the best model for its task on the providers that offer it. See the quickstart and the API reference.

Look up this model

curl 'https://rhumbdata.com/v1/models/xai/grok-4.20-0309-reasoning' \
  -H "Authorization: Bearer $RHUMB_KEY"

Resolve text.chat on its providers

curl 'https://rhumbdata.com/v1/resolve?task=text.chat&providers=vertex,xai' \
  -H "Authorization: Bearer $RHUMB_KEY"

Built from catalog version 2026-11-04.3 of 2026-11-04. Prices are list prices per 1M tokens unless marked otherwise; every score shows its source's notice (see Attributions).