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xAI: Grok 4.20 (Reasoning)

Reasoning Grok for document-heavy analysis and long-horizon tool use

Source-linked grok Closed weights Released 2026-03-09
API record Report
InputT
OutputT
Input price$1.25/M
Output price$2.5/M
Context1M
Max output30K
Providers11
Inference availability

Providers

Provider-specific identifiers, limits, and listed prices per million tokens. Every row links back to the provider's own documentation.

Report a price
Providers offering Grok 4.20 (Reasoning)
ProviderProvider model IDContextMax outputInputOutputCache readCapabilitiesDocs
DevPass (LLM Gateway) grok-4-20-reasoning 2M 30K $1.25 $2.5 $0.2 ReasoningToolsJSON Docs ↗
Impossibl xai/grok-4.20-0309-reasoning 1M 30K $1.25 $2.5 $0.2 ReasoningToolsJSON Docs ↗
Eden AI xai/grok-4.20-0309-reasoning 1M 30K $1.25 $2.5 $0.2 ReasoningToolsJSON Docs ↗
Vertex xai/grok-4.20-reasoning 2M 30K $1.25 $2.5 $0.2 ReasoningToolsJSON Docs ↗
xAI grok-4.20-0309-reasoning 1M 30K $1.25 $2.5 $0.2 ReasoningToolsJSON Docs ↗
Cloudflare AI Gateway grok/grok-4.20-0309-reasoning 1M 30K $1.25 $2.5 $0.2 ReasoningToolsJSON Docs ↗
Merge Gateway xai/grok-4.20-0309-reasoning 1M 1M $1.25 $2.5 $0.2 ReasoningToolsJSON Docs ↗
Cloudflare AI Gateway xai/grok-4.20-0309-reasoning 2M 30K $2 $6 $0.2 ReasoningToolsJSON Docs ↗
Azure grok-4-20-reasoning 262K 8.192K $2 $6 ReasoningTools Docs ↗
DevPass (LLM Gateway) grok-4-20-beta-0309-reasoning 2M 30K $2 $6 $0.2 ReasoningToolsJSON Docs ↗
Ofox x-ai/grok-4.20 2M 128K $4 $12 $0.4 ReasoningToolsJSON Docs ↗

Capability badges appear only where the provider catalog explicitly lists support. A blank cell means the source is silent, not that the feature is absent.

Listed rates

Price across providers

Input price per million tokens as published by each provider. Bars are drawn from listed rates only — no traffic weighting, since the catalog observes no requests.

Lowest input $1.25/M

Across 11 priced providers

Median input $1.25/M

Midpoint of listed rates

Highest input $4/M

3.2× the lowest listed rate

Output range $2.5 – $12

Per million output tokens

DevPass (LLM Gateway) $1.25/M
Impossibl $1.25/M
Eden AI $1.25/M
Vertex $1.25/M
xAI $1.25/M
Cloudflare AI Gateway $1.25/M
Merge Gateway $1.25/M
Cloudflare AI Gateway $2/M
Azure $2/M
DevPass (LLM Gateway) $2/M
Ofox $4/M
Cost calculator

Estimate a workload

$0.00
Excludes taxes, non-token charges, and tiered discounts.

7 providers list the identical $1.25 input rate, so price alone will not separate them — compare context limits, max output, and capabilities above.

Context limits also differ by provider, from 262K to 2M tokens. Compare the provider table above before choosing on price alone.

Specification

Capabilities

Recorded from the source catalog and provider listings.

Reasoning Yes
Tool calling Yes
Structured output Yes
Attachments Yes
Vision input Yes
× Open weights No
Creator
xAI
Model family
grok
Knowledge cutoff
Not documented
License
Not documented
Release date
2026-03-09
Model ID
xai/grok-4.20-0309-reasoning
Published evaluations

Benchmarks

Every result stays attached to its source, version, metric and harness. Scores from different versions are never merged, and the profile below plots each benchmark against its own population rather than on a shared scale.

Benchmark registry
No published benchmark results

ModelBench does not infer quality from price, context size, or model name. When a source publishes a comparable result, it appears here with its version and link.

Read the methodology
Catalog activity

Change log

Field-level changes detected between successful source imports.

Full change log
No changes recorded

This record has not changed within the retained import history.

Provenance

Sources & verification

Every figure on this page traces back to one of these records.

Methodology
Public API

Use this record

Fetch the complete source-linked model record. No key, no account, no rate-limited tier.

API documentation
Endpoint
GET https://model.kyssta.lol/api/v1/models/xai/grok-4.20-0309-reasoning
curl
curl "https://model.kyssta.lol/api/v1/models/xai/grok-4.20-0309-reasoning"
Common questions

Frequently asked questions

Answered directly from the stored record — nothing here is generated beyond the catalog's own fields.

What is Grok 4.20 (Reasoning)?

Reasoning Grok for document-heavy analysis and long-horizon tool use. It is published by xAI and catalogued here from Models.dev.

How much does Grok 4.20 (Reasoning) cost?

Listed input pricing starts at $1.25 per million tokens from DevPass (LLM Gateway), rising to $4 across 11 listed providers.

What is the context length of Grok 4.20 (Reasoning)?

Grok 4.20 (Reasoning) accepts up to 1M tokens of context and returns up to 30K output tokens.

Does Grok 4.20 (Reasoning) support tool calling and structured output?

Provider catalogs list support for tool calling, structured output, reasoning, and image input.

Which providers serve Grok 4.20 (Reasoning)?

9 providers list this model: DevPass (LLM Gateway), Impossibl, Eden AI, Vertex, xAI, Cloudflare AI Gateway and 3 more.

Are the weights for Grok 4.20 (Reasoning) open?

No. This model is served through hosted APIs only.

When was Grok 4.20 (Reasoning) released?

The catalog records a release date of 2026-03-09, last verified Sep 11, 2026.

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