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What is Grok Code Fast 1?

Grok Code Fast 1 is the latest model in the Grok family, engineered to deliver fast, economical, and developer-friendly performance for agentic coding. Recognizing the inefficiencies of slower reasoning models, the team at xAI built it from the ground up with a fresh architecture and a dataset tailored to software engineering. Its training corpus combines programming-heavy pre-training with real-world code reviews and pull requests, ensuring strong alignment with actual developer workflows. The model demonstrates versatility across the development stack, excelling at TypeScript, Python, Java, Rust, C++, and Go. In performance tests, it consistently outpaces competitors with up to 190 tokens per second, backed by caching optimizations that achieve over 90% hit rates. Integration with launch partners like GitHub Copilot, Cursor, Cline, and Roo Code makes it instantly accessible for everyday coding tasks. Grok Code Fast 1 supports everything from building new applications to answering complex codebase questions, automating repetitive edits, and resolving bugs in record time. The cost structure is intentionally designed to maximize accessibility, at just $0.20 per million input tokens and $1.50 per million outputs. Real-world human evaluations complement benchmark scores, confirming that the model performs reliably in day-to-day software engineering. For developers, teams, and platforms, Grok Code Fast 1 offers a future-ready solution that blends speed, affordability, and practical coding intelligence.

What is GPT‑5.3‑Codex‑Spark?

GPT-5.3-Codex-Spark is a specialized, ultra-fast coding model designed to enable real-time collaboration within the Codex platform. As a streamlined variant of GPT-5.3-Codex, it prioritizes latency-sensitive workflows where immediate responsiveness is critical. When deployed on Cerebras’ Wafer Scale Engine 3 hardware, Codex-Spark delivers more than 1000 tokens per second, dramatically accelerating interactive development sessions. The model supports a 128k context window, allowing developers to maintain broad project awareness while iterating quickly. It is optimized for making minimal, precise edits and refining logic or interfaces without automatically executing additional steps unless instructed. OpenAI implemented extensive infrastructure upgrades—including persistent WebSocket connections and inference stack rewrites—to reduce time-to-first-token by 50% and cut client-server overhead by up to 80%. On software engineering benchmarks such as SWE-Bench Pro and Terminal-Bench 2.0, Codex-Spark demonstrates strong capability while completing tasks in a fraction of the time required by larger models. During the research preview, usage is governed by separate rate limits and may be queued during peak demand. Codex-Spark is available to ChatGPT Pro users through the Codex app, CLI, and VS Code extension, with API access for select design partners. The model incorporates the same safety and preparedness evaluations as OpenAI’s mainline systems. This release signals a shift toward dual-mode coding systems that combine rapid interactive loops with delegated long-running tasks. By tightening the iteration cycle between idea and execution, GPT-5.3-Codex-Spark expands what developers can build in real time.

Media

Media

Integrations Supported

C
Cline
Dessix
Devin Desktop
Go
Java
JavaScript
Kilo Code
Laravel
Microsoft Foundry Models
OpenRouter
PHP
Roo Code
Shiori
TypeScript
Visual Studio
Visual Studio Code

Integrations Supported

Codex CLI
OpenAI
OpenAI Codex

API Availability

Has API

API Availability

Has API

Pricing Information

$0.20 per million input tokens
$0.20 per million input tokens
$1.50 per million output tokens
$0.02 per million cached tokens
Free Version
Free Trial Offered?

Pricing Information

Pricing not provided

Supported Platforms

SaaS
Windows
Mac
Linux

Supported Platforms

SaaS

Customer Service / Support

Web-Based Support

Customer Service / Support

Web-Based Support

Training Options

Documentation Hub

Training Options

Documentation Hub

Company Facts

Organization Name

SpaceXAI

Date Founded

2023

Company Location

United States

Company Website

x.ai

Company Facts

Organization Name

OpenAI

Date Founded

2015

Company Location

United States

Company Website

openai.com

Categories and Features

Agentic AI

Not specified

AI Coding Agents

Not specified

AI Coding Models

Not specified

AI Models

Not specified

Categories and Features

Agentic AI

Not specified

AI Coding Agents

Not specified

AI Coding Models

Not specified

AI Models

Not specified

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