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xAI / lineage

xAI Grok family

Grok generations and Fast-labelled rows retain their own evidence. Reasoning effort and multi-agent behaviour are model-specific controls, not a shared family setting.

Family research reviewed · Official source notes below

Standard models
7
Independently rated
3 / 7
Known token rates
7 / 7
Global balanced frontier
0

Before you choose

Reasoning controls differ

The current reasoning guide distinguishes ordinary effort from multi-agent effort. Its Responses API reasoning representation also differs from ordinary Chat Completions.

Grok reasoning documentation ↗

Compare exact catalogue rows

USD per 1M tokens. In / out are listed base rates; expand billing conditions before planning a request. LMArena scores measure the general preference board, not success on your engineering task. Unknown stays unknown.

Catalogue members

ModelLMArenaInput / output $/MContext / max outputCapabilities & conditions
Grok 4.7
CheckCompareFull evidence ↗
x-ai/grok-4.7		Unrated$1.60 / $4.80Context tiers apply
Billing details
Cached input
$0.400
Separate reasoning
Not separately listed
  • Above 200,000 input tokens: $3.20 in / $9.60 out; cached $0.800.

Tool, media, cache-write and service-tier charges may add dimensions. Read the full model evidence.

500,000Output 450,000text · image · fileTools yes · reasoning yesWeights unknownReleased 2026-09-21
Grok 4.6
CheckCompareFull evidence ↗
x-ai/grok-4.6		1429.9±5.8 interval half-widthEffort: high$2.00 / $6.00Context tiers apply
Billing details
Cached input
$0.500
Separate reasoning
Not separately listed
  • Above 200,000 input tokens: $4.00 in / $12.00 out; cached $1.00.

Tool, media, cache-write and service-tier charges may add dimensions. Read the full model evidence.

500,000Output 450,000text · image · fileTools yes · reasoning yesClosed weightsReleased 2026-08-12
Grok 4.5
CheckCompareFull evidence ↗
x-ai/grok-4.5		1450.1±4.7 interval half-widthEffort: default$2.00 / $6.00Context tiers apply
Billing details
Cached input
$0.300
Separate reasoning
Not separately listed
  • Above 200,000 input tokens: $4.00 in / $12.00 out; cached $0.600.

Tool, media, cache-write and service-tier charges may add dimensions. Read the full model evidence.

500,000Output 450,000text · image · fileTools yes · reasoning yesClosed weightsReleased 2026-07-08
Grok Build 0.1
CheckCompareFull evidence ↗
x-ai/grok-build-0.1		Unrated$1.00 / $2.00Context tiers apply
Billing details
Cached input
$0.200
Separate reasoning
Not separately listed
  • Above 200,000 input tokens: $2.00 in / $4.00 out; cached $0.400.

Tool, media, cache-write and service-tier charges may add dimensions. Read the full model evidence.

256,000Output 230,400text · image · fileTools yes · reasoning yesClosed weightsReleased 2026-05-20
Grok 4.3
CheckCompareFull evidence ↗
x-ai/grok-4.3		1397.7±3.7 interval half-widthEffort: default$1.25 / $2.50Context tiers apply
Billing details
Cached input
$0.200
Separate reasoning
Not separately listed
  • Above 200,000 input tokens: $2.50 in / $5.00 out; cached $0.400.

Tool, media, cache-write and service-tier charges may add dimensions. Read the full model evidence.

1,000,000Output 900,000text · image · fileTools yes · reasoning yesClosed weightsReleased 2026-04-30
Grok 4.20 Multi-Agent
CheckCompareFull evidence ↗
x-ai/grok-4.20-multi-agent		Unrated$1.25 / $2.50Context tiers apply
Billing details
Cached input
$0.200
Separate reasoning
Not separately listed
  • Above 200,000 input tokens: $2.50 in / $5.00 out; cached $0.400.

Tool, media, cache-write and service-tier charges may add dimensions. Read the full model evidence.

2,000,000Output 1,800,000text · image · fileTools no · reasoning yesWeights unknownReleased 2026-03-31
Grok 4.20
CheckCompareFull evidence ↗
x-ai/grok-4.20		Unrated$1.25 / $2.50Context tiers apply
Billing details
Cached input
$0.200
Separate reasoning
Not separately listed
  • Above 200,000 input tokens: $2.50 in / $5.00 out; cached $0.400.

Tool, media, cache-write and service-tier charges may add dimensions. Read the full model evidence.

2,000,000Output 1,800,000text · image · fileTools yes · reasoning yesClosed weightsReleased 2026-03-31

Free and batch variants

These rows have different access or processing conditions. They are excluded from the standard-row counts above. A variant without a standard base remains a separately named variant.

Sources and scope

  • Grok reasoning documentation ↗

    Exact named models on the vendor platform; not a promise about every reseller

    Checked 2026-09-22 · official document opened and inspected

Source review does not refresh a price or transplant a benchmark score. Read the method and correction policy.

Questions this page answers

Are the xAI Grok family models interchangeable?

No. These are exact catalogue rows with separate capability, pricing and rating evidence. Compare the checkpoint, serving endpoint, reasoning settings and required input types. A family name does not establish equivalent behaviour.

How many xAI rows are compared here?

7 standard rows, of which 3 have an accepted LMArena general score and 7 have known input and output token rates. 1 related free or batch variants are listed separately.

What do the prices and frontier counts mean?

Prices below are listed US dollars per million input or output tokens, before request-specific context tiers and other billing dimensions. The frontier count comes from the global balanced view. Neither a family price range nor a benchmark difference proves your task will be cheaper or more successful.

How current are the official notes?

The linked family research was reviewed 2026-09-22. That date is separate from each accepted catalogue observation and each vendor’s effective date. An official note applies to its named platform, not automatically to every reseller.

Evidence & Ask