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Model infoModelsSnapshot: 15 Oct 2026

xAI / Grok Build

Grok Build 0.1

Text generation and tool use through the Grok API.

availableClosed weightsText generationAgentsReasoningCoding
Official documentation (opens in a new tab)Reviewed 12 Oct 2026
14 of 20 specification fields collected
Context window256K256,000 tokens
Maximum outputNot collectedAwaiting source review
Input / 1M tokens$1.00xAI API
Output / 1M tokens$2.00USD · observed 12 Oct 2026

Specifications

Provider-documented facts. “Not collected” means we have not verified that field yet, not that the feature is unsupported.

Maximum output
Not collected
Streaming
SupportedSource for Streaming (opens in a new tab)

SSE streaming is documented for text-output models.

Batch processing
Not supportedSource for Batch processing (opens in a new tab)

Not supported

Fine-tuning
Not collected
Knowledge cutoff
Not collected
Release date
2026-05Source for Release date (opens in a new tab)

API availability announcement month from the provider changelog; exact day not collected.

Parameters
Not collected
Architecture
Not collected
Languages
Not collected
API aliases
grok-code-fast-1, grok-code-fast, grok-code-fast-1-0825Source for API aliases (opens in a new tab)

Routing aliases may point to a newer release. They are not additional independent models.

Published availability regions
us-east-1, us-west-2Source for Published availability regions (opens in a new tab)

Published model regions are not a processing-location guarantee for the global endpoint.

Published request quota
37 requests/secondSource for Published request quota (opens in a new tab)

Published card quota; team-specific rate limits may differ.

Published token quota
10,000,000 tokens/minuteSource for Published token quota (opens in a new tab)

Published card quota; team-specific rate limits may differ.

Context caching
SupportedSource for Context caching (opens in a new tab)

Documented on at least one recorded endpoint. See Caching for host, lifecycle and billing restrictions.

Access & pricing

Prices belong to an endpoint and billing tier. A provider listing does not guarantee access for every account or region.

API model ID
grok-build-0.1
Access
API account required. Model access and quotas depend on the team and location.
Regions
Global endpoint; processing location is not guaranteed.
INPUT / 1M TOKENS$1.00
OUTPUT / 1M TOKENS$2.00

Global standard token rates. At 200,000 prompt tokens or more, higher rates apply to all tokens in the request. Tool charges are additional. Cached input price: $0.20 / 1M tokens (base tier).

Pricing by prompt length, USD / 1M tokens
Input lengthInputOutputCached input
Below 200,000 prompt tokens$1.00$2.00$0.20
200,000 or more prompt tokens$2.00$4.00$0.40
USD · observed 12 Oct 2026 · Pricing evidence (opens in a new tab)

Data & enterprise terms

Provider documents no training on API inputs or outputs without explicit permission, and default 30-day audit retention. Team-level zero data retention changes available features; consult the linked policy for scope and exceptions.

Read the service policy (opens in a new tab)

Caching

Caching can reuse earlier input processing. Availability, lifetime and billing depend on the endpoint. A cache hit still generates a new response.

01 / INITIAL INPUTProcess & retain

The system processes eligible input and retains reusable state.

02 / LATER REQUESTCheck available state

Reuse depends on matching input, session state and the cache policy.

03 / CACHE HITReuse & generate

Reusing state can reduce repeated work. Any charges follow the billing rules below.

xAI API

grok-build-0.1
Documented
Support evidence (opens in a new tab)
How it works
Automatic prefix cachingSource for How it works (opens in a new tab)
Minimum reusable input
Not collected
Lifetime & refresh
No guaranteed duration. Entries can be evicted because of load or server restarts.Source for Lifetime & refresh (opens in a new tab)
How to enable it
Keep the initial messages unchanged. Use x-grok-conv-id, or prompt_cache_key in Responses, to improve routing consistency.Source for How to enable it (opens in a new tab)
Usage fields
Chat: usage.prompt_tokens_details.cached_tokens. Responses: usage.input_tokens_details.cached_tokens.Source for Usage fields (opens in a new tab)
Billing rules
Cached input uses the rate for the selected model and endpoint. Uncached input and output are billed separately; observe any prompt-length tiers.Source for Billing rules (opens in a new tab)
Limits & data boundaries
Hits are best effort. Editing or reordering early messages breaks prefix reuse. Streaming and tool-call history are supported.Source for Limits & data boundaries (opens in a new tab)
Cache reads, writes & storage
ChargeApplies toRate / unit
Cache read1Text tokens · Below 200,000 prompt tokens$0.20 / 1M tokensPricing evidence (opens in a new tab)
Cache read1Text tokens · 200,000 or more prompt tokens$0.40 / 1M tokensPricing evidence (opens in a new tab)

Rate conditions

  1. Global standard token rates. At 200,000 prompt tokens or more, higher rates apply to all tokens in the request. Tool charges are additional.

Observed 12 Oct 2026. Write rates and storage fees are different charges; use the billing rules above.

Caching reviewed 12 Oct 2026

What the measurements say

No benchmark observations have been added for this model. We do not turn a vendor description into a performance score.

Latency and throughput depend on the host, request size, reasoning settings and load. There is no measured speed or global usage figure in this record.

The record behind the model

Why it is included

Developer-documented proprietary hosted Grok release. No public weights identified for this release in the reviewed documentation; public Grok 1 and Grok 2 base-weight releases are excluded.

Classification evidence (opens in a new tab)

Sources reviewed