SylphxModels

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Grok Build family · v0.1

Grok Build 0.1

x-ai/grok-build-0.1

Grok Build 0.1 on Sylphx Models · 256K of context. One Responses contract, with list prices published per million tokens.

Released
Apr 16, 2026 · 163 days old
Provider
xAI
Context
256,000 tokens
Get an API keySee a request sampleRead the docs
Input $1.155 / MOutput $2.31 / MCached input $0.231 / MFull rate sheet
Context window256,000tokens per request
Max output256,000tokens per response
Input$1.155 / Mper million tokens
Output$2.31 / Mper million tokens
Cached input$0.231 / M80% off input
ReleasedApr 16, 2026163 days old

Pricing

USD per million tokens
Input
$1.155
Output
$2.31
Cached input
$0.231

$1.44 for 750,000 input and 250,000 output tokens.

Assumption: one batch of 750,000 input plus 250,000 output tokens at the published list prices — recompute for your own mix. Blended $1.444 per million at a 3:1 mix.

Chat replies · 3:1 input:output
$1.444 / M
Long documents · 9:1 input:output
$1.271 / M
Heavy output · 1:1 input:output
$1.732 / M
Cache write
$1.155 / M
Currency and unit
USD / million tokens

Cached input reads cost 80% less than fresh input tokens.

Full rate sheet and billing rules.

Specification

Context window
256,000 tokens
Max output
256,000 tokens
Input modalities
Not published
Output modalities
Not published
Family
Grok Build
Version
v0.1
Provider
xAI
Released
Apr 16, 2026 · 163 days old
Model id
x-ai/grok-build-0.1

Data posture

Standard

By default, prompts and outputs sent to this model are not used to train models.

Training on what you send · default
No
Zero Data Retention · default
Yes
curl https://api.sylphx.ai/v1/responses \
  -H "Authorization: Bearer $SYLPHX_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "x-ai/grok-build-0.1",
    "input": "Summarise this incident report in three bullets.",
    "stream": false
  }'

How to call it

Send the official Responses document to the base URL above with your Sylphx API key and this exact model id. Streaming arrives as ordered events with one terminal event.

  • Retries: send an Idempotency-Key and a retry replays the original response instead of billing twice.
  • Errors: typed envelopes tell you whether to retry, wait, or fix the request.
  • Keys: create and revoke Sylphx API keys in the Sylphx console.
QuickstartResponses APIErrors and retries

Related models

Derived from this catalog: same provider first, then the same family, then the nearest neighbours by input price and context window.

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Nearest by input price and context window

Independent evaluation

We do not publish benchmark scores for this model — we have not verified any. These external leaderboards run their own tests, so check them against your own workload.

Not our numbers
Every xAI model →