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xAI · Balanced

Grok Build 0.1

Added May 20, 2026

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Use in the app

Grok Build 0.1 is SpaceXAI's fast coding model trained specifically for agentic software engineering workflows. It supports text and image inputs with text output, and is optimized for interactive coding agents, tool use, and multi-step development tasks. Currently in early access. Content policy rejections can still be charged: SpaceXAI may pass through a $0.05 moderation-failure fee, or a $0.055 usage-guidelines violation fee, depending on which rejection upstream returns.

  • Reasoning
  • Tools
  • Vision
  • Structured output
Input
Text, Images
Output
Text
Discovery tier
Balanced

Pricing

USD per 1M tokens
Input
$1.00
Output
$2.00
Cache read
$0.20

Reference prices as published by the model provider. API example

Specifications

Context window
256K
Max output
—
Average output (7 days)
3K tokens
Longer than 96% of 473 models

Side by side

Grok Build 0.1 compared

Specifications, prices, speed and benchmark scores next to each other. Benchmarks below show every compared model too.

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Grok Build 0.1xAIThis modelGrok 4.3xAIRemove
ProviderxAIxAI
Discovery tierBalancedBalanced
AddedMay 20, 2026Apr 30, 2026
Limits
Context window256K1MBest
Average output3K tokens466 tokens
Pricing, USD per 1M tokens
Input$1.00Best$1.25
Output$2.00Best$2.50
Cache read$0.20$0.20
Performance
Throughput—357.8 tok/s
Time to first token—17.5 s
Request success (24h)—100.0%
Benchmark indexes
Intelligence Index27.2Best14.0
Coding Index51.5Best35.2
Capabilities
ReasoningYesYes
ToolsYesYes
VisionYesYes
Structured outputYesYes
Reasoning effort——

Public evaluations

Benchmarks

Independent evaluation results, with how each score ranks among the models in the Noumen catalog.

  • Grok Build 0.1
  • Grok 4.3

Intelligence Index

  • Grok Build 0.127.2
  • Grok 4.314.0

Grok Build 0.1: Better than 69% of 326 scored models

3.8Catalog models by score55.1

Indexes

  • Coding Index

    Composite of the coding evaluations

    • Grok Build 0.1: 51.5Top
    • Grok 4.3: 35.2

Agentic work

  • AutomationBench-AA

    Workflow automation, penalized for guardrail violations

    • Grok Build 0.1: —
    • Grok 4.3: 0.9%

  • AutomationBench-AA tasks completed

    Workflows finished end to end without a guardrail violation

    • Grok Build 0.1: —
    • Grok 4.3: 0.2%

  • AA-Briefcasev1.1

    Agentic knowledge work, rated head to head

    • Grok Build 0.1: —
    • Grok 4.3: 724 Elo

  • GDPval-AAv2.1

    Economically valuable occupational tasks, rated head to head

    • Grok Build 0.1: 1,065 EloTop
    • Grok 4.3: 941 Elo

Document reasoning

  • GDP.pdf

    Professional reasoning over PDF documents, all-pass rate

    • Grok Build 0.1: —
    • Grok 4.3: 2.8%

  • AA-LCRv1.1

    Reasoning across long documents

    • Grok Build 0.1: 74.7%Top
    • Grok 4.3: 32.3%

  • MLCR-AA

    Long-context reasoning over medical records

    • Grok Build 0.1: —
    • Grok 4.3: 5.6%

Reasoning and knowledge

  • Humanity’s Last Exam

    Expert-level questions across academic fields

    • Grok Build 0.1: 38.3%Top
    • Grok 4.3: 6.8%

  • GPQA Diamond

    Graduate-level science questions

    • Grok Build 0.1: 89.5%Top
    • Grok 4.3: 65.8%

  • IFBench

    Following precise output instructions

    • Grok Build 0.1: —
    • Grok 4.3: 47.6%

Coding

  • Terminal-Benchv4.0

    Practical software engineering in a terminal

    • Grok Build 0.1: —
    • Grok 4.3: 0.0%

  • SciCode

    Scientific computing in Python

    • Grok Build 0.1: —
    • Grok 4.3: 39.4%

Legacy evaluations

  • Terminal-Bench Hard

    Earlier terminal task suite

    • Grok Build 0.1: —
    • Grok 4.3: 18.9%

  • τ²-Bench Telecom

    Tool use in a customer-support simulation

    • Grok Build 0.1: —
    • Grok 4.3: 65.8%

  • AA-LCR (unversioned)

    Long-context reasoning, earlier grading

    • Grok Build 0.1: 74.7%Top
    • Grok 4.3: 32.3%

Scores from Artificial Analysis, updated Oct 26, 2026. Artificial Analysis

Developers

Use it through the API

Noumen’s API is OpenAI-compatible: any Chat Completions client works with a base URL and a key.

Read the quickstart
curl https://www.noumen.xyz/api/v1/chat/completions \
  -H "Authorization: Bearer $NOUMEN_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "x-ai/grok-build-0.1",
    "messages": [{ "role": "user", "content": "Explain this stack trace." }]
  }'
import os
from openai import OpenAI

client = OpenAI(base_url="https://www.noumen.xyz/api/v1", api_key=os.environ["NOUMEN_API_KEY"])
reply = client.chat.completions.create(
    model="x-ai/grok-build-0.1",
    messages=[{"role": "user", "content": "Explain this stack trace."}],
)
print(reply.choices[0].message.content)

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