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Grok 4.20 (Reasoning)

API ID grok-4.20-0309-reasoning

grok-4.20-0309-reasoning is an xAI model. Standard price: from $1.25 input and from $2.50 output per 1M tokens.

Status
Active
Released
—
Shutdown
none announced
Replacement
—

No deprecation or shutdown date has been announced as of October 15, 2026.

Benchmarks

Scores as each source published them
or

Comparing with Grok 4 (0709), the previous model in this line. A score is compared only with the same benchmark from the same source, at the same setting where both have it. Full comparison: prices, limits, features

Arena

ArenaGrok 4.20 (Reasoning)Grok 4 (0709)ChangeRankDateSource
Text
By category
  • Math 1465 rank 61 vs 1425 (+40)
  • Creative writing 1445 rank 50 vs 1394 (+51)
  • Instruction following 1447 rank 69 vs 1396 (+51)
  • Hard prompts 1489 rank 51 vs 1420 (+69)
  • Long prompts 1466 rank 68 vs 1416 (+50)
  • Multi-turn 1478 rank 42 vs 1413 (+65)
  • Expert 1477 rank 77 vs 1429 (+48)
1472 ±41411 ±4+6146 of 415
66,463 votes		Oct 13, 2026source
Text: Coding1511 ±61435 ±7+7659 of 410
18,372 votes		Oct 13, 2026source
WebDev1375 ±6not rated101 of 142
15,477 votes		Oct 13, 2026source
Vision1256 ±61184 ±7+7250 of 165
26,828 votes		Oct 9, 2026source
Document1439 ±7not rated35 of 44
20,948 votes		Sep 13, 2026source

Rated as grok-4.20-beta-0309-reasoning; Grok 4 (0709) as grok-4-0709. Ratings come from people voting between two anonymous answers; Text, Vision and Document are style-controlled, as on arena.ai. Not rated on Search, where Grok 4 (0709) is. Data: Arena (arena.ai), CC BY 4.0.

Epoch AI

BenchmarkGrok 4.20 (Reasoning)Grok 4 (0709)ChangeSettingRunSource
FrontierMath Tier 417.1%not runJul 13, 2026source
FrontierMath Tiers 1-344.9%not runJul 13, 2026source
GPQA Diamond89.3%87.0%+2.3 ptsJul 13, 2026source
OTIS Mock AIME 2024-202592.2%84.0%+8.2 ptsJul 13, 2026source
SimpleQA Verified30.2%not runAug 27, 2026source

Run independently by Epoch AI. Data: Epoch AI, Capabilities & benchmarking (epoch.ai/benchmarks), CC BY.

On cloud platforms

All platform dates
PlatformPlatform IDStateShutdownTime leftReplacementSource
Microsoft Foundryversion 1grok-4-20-reasoningActiveApr 6, 2027173 days—source

Read daily from each platform's own pages. The shutdown date and countdown on this page use xAI's own date. Time left counts to 00:00 UTC on the shutdown date, which is the evening before in ET.

Price history

USD per 1M tokens, standard tier
$0.00$1.00$2.00$3.00Oct 2026In $1.25Out $2.50Oct 5, 2026 to Oct 15, 2026: Input $1.25, Output $2.50
$0.00$1.00$2.00$3.00Oct 2026In $1.25Out $2.50Oct 5, 2026 to Oct 15, 2026: Input $1.25, Output $2.50

We started recording this model's prices on Oct 5, 2026. The history grows with each daily check.

Show as a table
FromTypePrice
Oct 5, 2026Input$1.25
Oct 5, 2026Output$2.50

Prices

USD per 1M tokens, every type and band, by tier
TypeBandPrice $/1MIn effect
Standard
inputup to 200k prompt$1.25
inputover 200k prompt$2.50
cached inputup to 200k prompt$0.20
cached inputover 200k prompt$0.40
outputup to 200k prompt$2.50
outputover 200k prompt$5.00

Changelog

Changes we detected on xAI's pages

No changes recorded yet.

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Last checked · Sources: xAI pricing, xAI notices, xAI release notes