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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 modelSolar Pro 4upstageRemove
ProviderxAIupstage
Discovery tierBalancedEfficient
AddedMay 20, 2026Aug 11, 2026
Limits
Context window256K524.29KBest
Max output—131.07K
Average output3K tokens546 tokens
Pricing, USD per 1M tokens
Input$1.00$0.03Best
Output$2.00$0.12Best
Cache read$0.20$0.006Best
Performance
Throughput—122.5 tok/s
Time to first token—3.6 s
Request success (24h)—99.9%
Benchmark indexes
Intelligence Index27.2Best26.6
Coding Index51.5—
Capabilities
ReasoningYesNo
ToolsYesYes
VisionYesNo
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
  • Solar Pro 4

Intelligence Index

  • Grok Build 0.127.2
  • Solar Pro 426.6

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: 51.5
    • Solar Pro 4: —

Agentic work

  • AutomationBench-AA

    Workflow automation, penalized for guardrail violations

    • Grok Build 0.1: —
    • Solar Pro 4: 13.6%

  • AutomationBench-AA tasks completed

    Workflows finished end to end without a guardrail violation

    • Grok Build 0.1: —
    • Solar Pro 4: 2.4%

  • AA-Briefcasev1.1

    Agentic knowledge work, rated head to head

    • Grok Build 0.1: —
    • Solar Pro 4: 1,093 Elo

  • GDPval-AAv2.1

    Economically valuable occupational tasks, rated head to head

    • Grok Build 0.1: 1,065 Elo
    • Solar Pro 4: 1,106 EloTop

Document reasoning

  • GDP.pdf

    Professional reasoning over PDF documents, all-pass rate

    • Grok Build 0.1: —
    • Solar Pro 4: 7.0%

  • AA-LCRv1.1

    Reasoning across long documents

    • Grok Build 0.1: 74.7%Top
    • Solar Pro 4: 70.7%

Reasoning and knowledge

  • Humanity’s Last Exam

    Expert-level questions across academic fields

    • Grok Build 0.1: 38.3%Top
    • Solar Pro 4: 29.8%

  • GPQA Diamond

    Graduate-level science questions

    • Grok Build 0.1: 89.5%Top
    • Solar Pro 4: 89.1%

Coding

  • Terminal-Benchv4.0

    Practical software engineering in a terminal

    • Grok Build 0.1: —
    • Solar Pro 4: 0.0%

  • SciCode

    Scientific computing in Python

    • Grok Build 0.1: —
    • Solar Pro 4: 48.0%

Legacy evaluations

  • AA-LCR (unversioned)

    Long-context reasoning, earlier grading

    • Grok Build 0.1: 74.7%Top
    • Solar Pro 4: 70.7%

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)

xAI

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