Search stories, models, companies…
Subscribe

Popular topics

OpenAI83Anthropic81Google Gemini45Claude Code27Coding agents51Model Context Protocol (MCP)13
The week in AI, in one email.
Topic · Product

Codex

Codex is OpenAI's coding agent, available in the terminal, in editors, in the cloud and inside ChatGPT. The name is older than the product: OpenAI used it in 2021 for a code-generation model that powered the first GitHub Copilot, and reused it in 2025 for the agent covered here.

18 stories · updated Oct 9
Follow via RSSGet Codex alerts

Key facts

Checked Oct 9
Codex CLI introduced
April 16, 2025 (open source)
Codex cloud agent
May 16, 2025 (codex-1)
CLI license
Apache-2.0

Latest on Codex

Agents · AnalysisThe case against unattended agents: what went wrong, and how sandboxing actually worksFrom a deleted production database to poisoned npm releases, documented agent failures share a pattern. Here's what the sandboxes in Claude Code, Codex and Copilot actually enforce.·9 min readAgents · BenchmarksSWE-bench, Terminal-Bench and METR: what coding-agent evaluations measure, and what their results don't proveOpenAI dropped SWE-bench Verified, Terminal-Bench is on version 4.0, and METR can't yet pin down AI's effect on developer speed. What published evaluations show, and their limits.·8 min readProducts · CompareChatGPT vs Claude for coding and writing: plans, models and limits comparedBoth start at $20 and go to $200 or more. We compare the models each plan gets, Codex vs Claude Code, context, limits and what leaderboards show.·Checked Oct 9Agents · CompareClaude Code vs Codex vs Cursor: features, prices and limits compared (October 2026)All three now run in the terminal, the IDE and the cloud. The real differences are how they meter usage, how they sandbox commands, and which models you get. Verified against official pages.·Checked Oct 9Agents · ExplainerOpenAI Codex explained: where it runs, which models and limits you get, and how its sandbox worksWhat Codex is in October 2026, from OpenAI's docs and pricing pages: where it runs, which plans get which models, how far the allowance goes, and what its sandbox enforces.·7 min readDevelopers · GuideHow to write a CLAUDE.md or AGENTS.md file that coding agents actually followWhere each agent looks for its instructions, how long the file should be, what to put in it, and how to check the agent is reading it, from Claude Code, Codex, Cursor and Copilot docs.·10 min readIndustry · ExplainerOpenAI explained: who controls it, what it sells, and how it makes moneyFrom a 2015 nonprofit to a public benefit corporation reportedly seeking a $1.4 trillion valuation: OpenAI's structure, Microsoft deal, products, prices and revenue.·7 min readAgents · ExplainerWhat "agentic" really means in 2026Every AI product now calls itself agentic. Here's the definition the labs themselves use, how the tool loop works, and how to tell a real agent from a relabeled chatbot.·6 min read

Nothing in this format on this page — try another filter or the next page.