Agent
Codex
Software engineering agent developed by OpenAI · Agent · Runs on ChatGPT
Made by OpenAI
The best way to build with agents. Codex accelerates real engineering work, from planning and building features to refactors, reviews, and releases.
Official page: openai.com/codex (opens in a new tab)
Sourced from
- openai.com
“The best way to build with agents. Codex accelerates real engineering work, from planning and building features to refactors, reviews, and releases.”
- Wikipedia
“Codex is an AI coding agent developed by OpenAI for software engineering tasks such as writing code and fixing bugs, released in April 2025 as Codex CLI.”
Named in 14 pieces
Agent Infrastructure
OpenAI Promises Codex Reset as Claude Pro Users Hit Limits
OpenAI's Codex lead pledged a daily fix or reset for 28 days, as Anthropic's own increase to Claude Pro nets out as a cut.
Agent Infrastructure
Five Memory Vendors Claim the Lead on One Benchmark
past.dev posted the highest BEAM scores yet, four rivals claimed the same crown since April, and AI Lately grades nine memory layers.
Frontier Models
Claude Tops 20 Reasoning AIs, and Sol Shines on Price
Claude Opus 5.5 reasons best of the 20 AIs we scored, OpenAI's GPT-6.1 Sol buys the most reasoning per dollar, and the tests keep breaking.
Consumer AI
OpenAI Gives Every ChatGPT Plan GPT-6 and Lets It Choose the Layout
OpenAI moved GPT-6 into the Chat tab for paid plans on Oct. 7 and free plans on Oct. 8, with a feature called Intelligent UI that lets the model decide whether an answer arrives as text, a chart, a form or a tool.
Frontier Models
Anthropic Posts Haiku 5.5 and OpenAI Answers With GPT-6 Four Minutes Later
Anthropic's Haiku 5.5 post landed at 2:01 p.m. Eastern on Oct. 7 and OpenAI's GPT-6 post at 2:05, the third time this year the two labs have shipped within an hour of each other, and the gap keeps shrinking.
Safety & Security
Oaths and Open Weights: Tuesday's Signal
OpenAI's Sam Altman tells the public to accept AI's harms as the price of its benefits, while Jacob Coxon tells New York City's Council that humanity is losing the argument.
Hiring & Talent
Successors and Syndicates: Saturday's Signal
Microsoft swaps veteran executives for a younger bench, a safety nonprofit sues OpenAI over a rogue agent, and Broadcom lines up a financing package that makes it both Anthropic's supplier and its lender.
Agent Infrastructure
OpenAI Launches Dots, Agents That Start Work Before You Ask
OpenAI unveiled dots at DevDay on Tuesday: always-on agents with their own cloud computers that read your connected apps and act on what they find. Pro plans from $100 a month and Business Premium get them first, with Pro held back in the EEA, Switzerland and the UK.
Consumer AI
The Signal Brief: Saturday's Swarms, Successions, and Scrutiny
A hardware engineer's debut keynote as Apple's chief executive, a lone attacker's AI-agent swarm breaching 395 organizations in a day, and Washington's scrutiny of Nvidia's Groq deal show trust becoming the industry's scarcest currency.
Research
Proof and Provenance: OpenAI's Millennium Moment
OpenAI's ten-thousand-agent proof of the Navier-Stokes equations showed frontier capability, and Sébastien Bubeck's handling of Tristan Buckmaster and Levent Alpöge's rival work showed what happens to credit when automation arrives first.
Agent Infrastructure
Agent Security Becomes a Board Matter
OpenAI's agents breached Hugging Face through reward hacking, Nvidia bought the compromised platform days later, and CrowdStrike posted its best quarter ever selling defenses against exactly that scenario.
Frontier Models
GPT-5 and the Cadence Behind It
OpenAI shipped GPT-5 and an open-weight sibling two days apart, then kept a numbered cadence running through 2026 while Jakub Pachocki, Mark Chen, Jerry Tworek and new arrival Noam Shazeer redrew the research org underneath it.
Applied AI
Coding Agents' Revenue Race
Cursor-maker Anysphere rode a $9.9 billion valuation to $29.3 billion in five months while Cognition bought Windsurf outright, turning software engineering into 2026's fastest-compounding subscription business.