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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.

What is Claude Sonnet 5?

Claude Sonnet 5 is Anthropic’s most advanced frontier model, engineered for sustained reasoning and complex, multi-stage tasks. It is optimized for long-horizon coding, agentic systems, and intensive interaction with computers and software tools. Sonnet 5 achieves state-of-the-art performance on the SWE-bench Verified benchmark, reflecting its deep software engineering expertise. It also leads the OSWorld benchmark, which evaluates real-world computer use capabilities. One of its defining strengths is the ability to maintain focus and coherence for more than 30 hours on demanding workflows. The model introduces major improvements in tool execution, memory management, and large-context reasoning. These upgrades allow it to handle extended conversations, multi-agent coordination, and iterative problem solving. Sonnet 5 supports context editing and persistent memory tools to maintain continuity across sessions. It can also execute code and create files directly within Claude applications. The model demonstrates strong understanding across technical and professional domains, including law, finance, and science. Claude Sonnet 5 is deployed under AI Safety Level 3 standards. Built-in classifiers and safeguards reduce risks related to prompt injection and sensitive outputs.

Media

Media

No images available

Integrations Supported

Microsoft Foundry
Amazon Bedrock
Brokk
Claude Pro
ClickUp Brain
Codex CLI
Devin
Doraverse
Emergent
F#
Go
Google Antigravity
IntelliJ IDEA
LaunchLemonade
OpenCode
ReSharper
Sup AI
Thread Deck
Vertex AI
Zo

Integrations Supported

Microsoft Foundry
Amazon Bedrock
Brokk
Claude Pro
ClickUp Brain
Codex CLI
Devin
Doraverse
Emergent
F#
Go
Google Antigravity
IntelliJ IDEA
LaunchLemonade
OpenCode
ReSharper
Sup AI
Thread Deck
Vertex AI
Zo

API Availability

Has API

API Availability

Has API

Pricing Information

Pricing not provided.
Free Trial Offered?
Free Version

Pricing Information

Pricing not provided.
Free Trial Offered?
Free Version

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Company Facts

Organization Name

OpenAI

Date Founded

2015

Company Location

United States

Company Website

openai.com

Company Facts

Organization Name

Anthropic

Date Founded

2021

Company Location

United States

Company Website

claude.ai

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