xAI · Balanced
Grok Build 0.1
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.
| Grok Build 0.1xAIThis model | Grok 4.5xAIRemove | |
|---|---|---|
| Provider | xAI | xAI |
| Discovery tier | Balanced | Frontier |
| Added | May 20, 2026 | Jul 8, 2026 |
| Limits | ||
| Context window | 256K | 500KBest |
| Average output | 3K tokens | 1K tokens |
| Pricing, USD per 1M tokens | ||
| Input | $1.00Best | $2.00 |
| Output | $2.00Best | $6.00 |
| Cache read | $0.20Best | $0.30 |
| Performance | ||
| Throughput | — | 54.2 tok/s |
| Time to first token | — | 2.5 s |
| Request success (24h) | — | 100.0% |
| Benchmark indexes | ||
| Intelligence Index | 27.2 | 38.8Best |
| Coding Index | 51.5 | 72.4Best |
| Capabilities | ||
| Reasoning | Yes | Yes |
| Tools | Yes | Yes |
| Vision | Yes | Yes |
| Structured output | Yes | Yes |
| Reasoning effort | — | low, medium, high |
Public evaluations
Benchmarks
Independent evaluation results, with how each score ranks among the models in the Noumen catalog.
- Grok Build 0.1
- Grok 4.5
Intelligence Index
- Grok Build 0.127.2
- Grok 4.538.8
Grok Build 0.1: Better than 69% of 326 scored models
Indexes
Coding Index
Composite of the coding evaluations
- Grok Build 0.1: 51.5
- Grok 4.5: 72.4Top
Agentic work
AutomationBench-AA
Workflow automation, penalized for guardrail violations
- Grok Build 0.1: —
- Grok 4.5: 57.9%
AutomationBench-AA tasks completed
Workflows finished end to end without a guardrail violation
- Grok Build 0.1: —
- Grok 4.5: 26.3%
AA-Briefcasev1.1
Agentic knowledge work, rated head to head
- Grok Build 0.1: —
- Grok 4.5: 1,278 Elo
GDPval-AAv2.1
Economically valuable occupational tasks, rated head to head
- Grok Build 0.1: 1,065 Elo
- Grok 4.5: 1,381 EloTop
Document reasoning
GDP.pdf
Professional reasoning over PDF documents, all-pass rate
- Grok Build 0.1: —
- Grok 4.5: 18.8%
AA-LCRv1.1
Reasoning across long documents
- Grok Build 0.1: 74.7%
- Grok 4.5: 79.3%Top
MLCR-AA
Long-context reasoning over medical records
- Grok Build 0.1: —
- Grok 4.5: 16.1%
Reasoning and knowledge
Humanity’s Last Exam
Expert-level questions across academic fields
- Grok Build 0.1: 38.3%
- Grok 4.5: 42.7%Top
GPQA Diamond
Graduate-level science questions
- Grok Build 0.1: 89.5%
- Grok 4.5: 93.1%Top
Coding
Terminal-Benchv4.0
Practical software engineering in a terminal
- Grok Build 0.1: —
- Grok 4.5: 10.6%
SciCode
Scientific computing in Python
- Grok Build 0.1: —
- Grok 4.5: 55.0%
Legacy evaluations
AA-LCR (unversioned)
Long-context reasoning, earlier grading
- Grok Build 0.1: 74.7%
- Grok 4.5: 79.3%Top
Scores from Artificial Analysis, updated Oct 26, 2026. Artificial Analysis
- Grok Build 0.1
- Grok 4.5
| Leaderboard | Grok Build 0.1 | Grok 4.5 |
|---|---|---|
| Vision Style Control · Chinese | Not in top 20 | #16 · 1330.1 |
| Vision Style Control · Creative Writing Vision | Not in top 20 | #14 · 1280.9 |
| Search Overall | Not in top 20 | #10 · 1215.9 |
| Document Style Control Overall | Not in top 20 | #16 · 1464.3 |
Ranks among Noumen catalog models on LMArena leaderboards. Only top-20 placements are listed.LMArena
- Grok Build 0.1
- Grok 4.5
| Leaderboard | Grok Build 0.1 | Grok 4.5 |
|---|---|---|
| FrontierCode Main | Not in top 20 | #20 · 42.4% |
| FrontierCode Extended | Not in top 20 | #18 · 56.5% |
Ranks among Noumen catalog models on FrontierCode leaderboards. Only top-20 placements are listed.FrontierCode
- Grok Build 0.1
- Grok 4.5
| Leaderboard | Grok Build 0.1 | Grok 4.5 |
|---|---|---|
| ARC-AGI-3 (Default harness) | Not in top 20 | #16 · 0.3% |
Ranks among Noumen catalog models on ARC Prize leaderboards. Only top-20 placements are listed.ARC Prize
Developers
Use it through the API
Noumen’s API is OpenAI-compatible: any Chat Completions client works with a base URL and a key.
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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