x-ai·Aug 26, 2025

xAI: Grok Code Fast 1

x-ai/grok-code-fast-1

context

256K

Max Output

10K

Input / 1M

$0.20

Output / 1M

$1.50

About

Grok Code Fast 1 is a low-cost reasoning model from xAI built specifically for agentic coding workflows, with reasoning traces visible in the response so developers can steer its behavior. It was built from a separate architecture with a pre-training corpus of programming-related data and post-training drawn from real pull requests and practical coding tasks, and is optimized for tool use such as grep, terminal operations, and file editing across languages including TypeScript, Python, Java, Rust, C++, and Go. The model emphasizes speed and prompt caching for high-volume iterative work, supports a 256,000-token context window, and reportedly scored 70.8% on the SWE-Bench-Verified subset using xAI's internal harness.

Capabilities

Context Length: 256K
Max Output: 10K
Reasoning: Yes
In: text
Out: text

Benchmarks

View leaderboard

21.6#78 of 133

Intelligence Index

23.7#80 of 118

Coding Index

43.3#41 of 63

Math Index

Reasoning & Knowledge

MMLU-Pro79.3%

GPQA Diamond72.7%

HLE7.5%

Coding & Agentic

LiveCodeBench65.7%

SciCode36.2%

Terminal-Bench Hard17.4%

Math

AIME 202543.3%

Source: Artificial Analysis

Pricing

Full pricing

Type	Price / 1M tokens
Input	$0.20
Output	$1.50
Cache Read	$0.02
Web Search	$0.0050 / call

API

API reference

OpenAI-compatible · Model ID x-ai/grok-code-fast-1

curl https://api.elliotgate.com/v1/chat/completions \
  -H "Authorization: Bearer sk-omg-your-api-key" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "x-ai/grok-code-fast-1",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'