Codex Knowledge Base
The Codex Subscription API: Programmatic Access to GPT-5.5 Through Your ChatGPT Plan
When OpenAI launched GPT-5.5 on 23 April 2026, a curious limitation accompanied the announcement: the model is available only through ChatGPT subscription.
Codex Labs and the GSI Network: What Enterprise-Scale Codex Deployment Means for CLI Power Users
On 21 April 2026, OpenAI announced Codex Labs alongside partnerships with seven Global Systems Integrators (GSIs) — Accenture, Capgemini, CGI, Cognizant.
The Codex CLI Speed Stack: Fast Mode, Reasoning Effort, Spark, and Performance Tuning
Codex CLI now ships four independent speed levers, each with its own trade-off envelope. This article maps every lever — Fast service tier, reasoning.
Codex CLI for Polyglot Codebases: Hierarchical AGENTS.md, Per-Directory Config, and Multi-Language Workflow Patterns
Most Codex CLI guides assume a single-language repository. Reality is messier — a TypeScript frontend, Go API gateway, Python ML services, and Rust.
Codex CLI Plugin Marketplace: Building, Distributing, and Managing Extensions at Scale
OpenAI launched the Codex plugin marketplace on 26 March 2026, packaging skills, MCP servers, and app integrations into shareable, installable bundles that.
Codex CLI as an MCP Server: Building Multi-Agent Workflows with the Agents SDK
Running Codex CLI as a Model Context Protocol (MCP) server unlocks a fundamentally different operating mode.
MCP Debugging and Diagnostics in Codex CLI: The Complete Troubleshooting Guide
Model Context Protocol servers are the primary extension mechanism for Codex CLI, connecting agents to external tools, APIs, and data sources.
Scripting the Issue-to-PR Pipeline: Automating the Complete GitHub Workflow with Codex CLI
GPT-5.5 landed yesterday with a 60% hallucination reduction and an 82.7% score on Terminal-Bench 2.0 .
v0.124 Hooks Migration Guide: From hooks.json to Inline config.toml
Codex CLI v0.124.0, released on 23 April 2026, marks hooks as stable and introduces inline hook definitions directly inside config.toml and requirements.toml.
Codex Chronicle and Screen-Context Memories: Ambient Developer Awareness for AI Coding Agents
On 20 April 2026, OpenAI shipped Chronicle as a research preview inside the Codex macOS app . The feature augments Codex's existing memory system with.