Grok 4.20
xAIfamily · Grokdocs.x.ai/developers/models/grok-4.20-0309-reaso
Grok 4.20 is a reasoning model from SpaceXAI with industry-leading speed and agentic tool calling capabilities. It combines the lowest hallucination rate on the market with strict prompt adherance, delivering...
Updated 5 h ago · first seen 11 Sept 2026
model_01M294WW257REBD60NE44YGEZQ
Overview
Identity
Identity block not returned by the API for this entity.
Openness
Openness not classified yet — no sourced evidence to place this model in the ontology.
Key facts
- Release date
Source:OpenRouter public model & pricing listingT2observed 12 h agomedium
- Status
Source:Artificial AnalysisT2observed 10 h agomedium
- Knowledge cutoff
Source:OpenRouter public model & pricing listingT2observed 12 h agomedium
- Official page
Source:xAI — docsT1observed 10 h agohigh
- API model id
Source:xAI — docsT1observed 10 h agohigh
- Openrouter id
Source:OpenRouter public model & pricing listingT2observed 12 h agomedium
Architecture
- Tokenizer
Source:OpenRouter public model & pricing listingT2observed 12 h agomedium
Capabilities
Modalities
- Modalities
- imagetext
- Input
- textimage
- Output
- text
Capabilities
Tool calling
Yes
OpenRouter public model & pricing listing · T2
Structured output
Yes
OpenRouter public model & pricing listing · T2
Reasoning
Yes
OpenRouter public model & pricing listing · T2
Vision
Yes
OpenRouter public model & pricing listing · T2
Audio
Unavailable
Fine-tuning available
Unavailable
- Context window
Source:xAI — docsT1observed 10 h agohigh
- Max output
Source:OpenRouter public model & pricing listingT2observed 12 h agomedium
- Knowledge cutoff
Source:OpenRouter public model & pricing listingT2observed 12 h agomedium
- Tokenizer
Source:OpenRouter public model & pricing listingT2observed 12 h agomedium
Benchmarks7
Compare with another model →Comparable same task and conditions · Partially comparable same task, conditions differ (effort, temperature, judge) · Not comparable different variant or metric
No benchmark results recorded
Providers & Pricing2
All offers in the price terminal →USD per 1M tokens as published by each provider (USD). Rows are append-only: every change is kept in the history below.
Price history
Output price · USD / 1M tokens 1 provider
- xAI API
- xAI APIfirst observed $2.511 Sept 2026
Input price · USD / 1M tokens 1 provider
- xAI API
- xAI APIfirst observed $1.2511 Sept 2026
Timeline12
Full timeline →Grok 4.20 scores 25.66 on Artificial Analysis Intelligence Index
artificial_analysisGrok 4.20: context length changed from 2000000 to 1000000
Context window2M tokens→1M tokensxaiGrok 4.20: modalities input changed from ["image", "text"] to ["text", "image"]
Input modalitiesimage, text→text, imagexaixAI API lists Grok 4.20 at $1.25 in / $2.5 out per 1M tokens
openrouter
Change history31
Viewing AI Atlas as of 12 Sept 2026 — attributes exactly as the atlas knew them on that day; later corrections are not shown.
Back to today →Attributes as of 12 Sept 2026 29 claims in force
- Family
- Grok
- Release date
- 31 Mar 2026
- Status
- deprecated
- Openness
- proprietary
- Context window
- 1M tokens
- Max output
- 1.8M tokens
- Knowledge cutoff
- Sept 2025
- Modalities
- image, text
- Input modalities
- text, image
- Output modalities
- text
- Tokenizer
- Grok
- API model id
- grok-4.20-0309-reasoning
- Official page
- Aa context window
- 2,000,000
- Aa deprecated
- Yes
- Aa openness
- proprietary
- Batch api
- Yes
- File input
- Yes
- Aa median output tokens per second
- 101.1
- Openrouter id
- x-ai/grok-4.20
- Openrouter listed at
- 31 Mar 2026
- Reasoning
- Yes
- Regions
- us-east-1, us-west-2
- Structured output
- Yes
- Supported parameters
- include_reasoning, logprobs, max_tokens, reasoning, response_format, seed, structured_outputs, temperature, tool_choice, tools, top_logprobs, top_p
- Tool calling
- Yes
- Vision
- Yes
- Weights available
- No
Familyfamily1
Release daterelease_date1
Statusstatus1
Opennessopenness1
Context windowcontext_length5conflicting claims
Max outputmax_output_tokens1
Knowledge cutoffknowledge_cutoff1
Modalitiesmodalities1
Input modalitiesmodalities_input4conflicting claims
Output modalitiesmodalities_output1
Tokenizertokenizer1
API model idapi_model_id1
Official pageofficial_url1
Batch apibatch_api1
Descriptiondescription1
File inputfile_input1
Aa median output tokens per secondmetric.aa_median_output_tokens_per_second1
Openrouter idopenrouter_id1
Reasoningreasoning1
Regionsregions1
Structured outputstructured_output1
Supported parameterssupported_parameters1
Tool callingtool_calling1
Visionvision1
Claims are temporal and append-only: a new observation closes the previous claim (valid_to) instead of overwriting it. Conflicting claims from different sources are kept side by side and flagged — never averaged. Methodology →
Provenance
Attributed facts
25
Source tiers
T1T27 / 18
Freshest observation
5 h ago
Conflicts
7 flagged
Source documents 4
Tier 1 = official/primary, 2 = quality secondary, 3 = community, 4 = unverified. Every snapshot is archived; see all sources and the methodology.
Data quality (66/100) measures how well AI Atlas knows this entity — completeness, primary-source ratio, freshness, conflicts — never how good the model is. Methodology →