OpenAI launches GPT-5.3-Codex, which it says runs 25% faster, enabling longer-running tasks, and “is our first model that was instrumental in creating itself”
ZDNET's key takeaways — GPT-5.3-Codex helped debug and deploy parts of itself. — Codex can be steered mid-task without losing context.
ZDNET David Gewirtz
Related Coverage
- Introducing Trusted Access for Cyber OpenAI
- GPT-5.3-Codex Hacker News
- OpenAI says new coding model helped build itself NBC News · Jared Perlo
- OpenAI Releases GPT-5.3-Codex Thurrott · Paul Thurrott
- OpenAI's GPT-5.3-Codex helped build itself The New Stack · Frederic Lardinois
- OpenAI's GPT-5.3-Codex drops as Anthropic upgrades Claude — AI coding wars heat up ahead of Super Bowl ads VentureBeat · Michael Nuñez
- Anthropic launches Claude Opus 4.6, OpenAI rolls out GPT-5.3-Codex Constellation Research · Larry Dignan
- OpenAI Just Launched GPT-5.3-Codex: A Faster Agentic Coding Model Unifying Frontier Code Performance And Professional Reasoning Into One System MarkTechPost · Asif Razzaq
- And 5.3 too. Dang these guys are in a sprint to catch up. OpenAI should've been first not last to get the ai agent on the desktop app, not Anthropic. … Scott Cunningham
- OpenAI Announces Trusted Access for Cyber: Model Hits High Cybersecurity Rating and 10 Million API Credits to Accelerate Defense Blockchain.News
- OpenAI's new coding model GPT-5.3-Codex helped build itself during training and deployment The Decoder · Matthias Bastian
- OpenAI launches new agentic coding model only minutes after Anthropic drops its own TechCrunch · Lucas Ropek
- OpenAI's new model leaps ahead in coding capabilities—but raises unprecedented cybersecurity risks Fortune · Sharon Goldman
- OpenAI debuts GPT-5.3-Codex: 25% faster and setting new coding benchmark records Neowin · Pradeep Viswanathan
- GPT-5.3 Codex Released: Full Benchmark Results and What's New The Mac Observer · Rajat Saini
- OpenAI releases its answer to Claude Code, first AI model with “high capability” risk for cybersecurity Sherwood News · Jon Keegan
Discussion
-
@zephyr_z9
@zephyr_z9
on x
Need more speed ups like this to enable long horizon tasks and not bore the user to death
-
@youjiacheng
You Jiacheng
on x
5.3 only uses 48% tokens of 5.2 (both xhigh) and has 25% higher TPS. the wallclock speedup is +160% (2.6× speed), crazy.
-
@scaling01
@scaling01
on x
GPT-5.3 Codex absolutely demolished Opus 4.6 (65.4%) on Terminal Bench 2 just minutes after its launch! [image]
-
@scaling01
@scaling01
on x
OpenAI released GPT-5.3-Codex with massive improvements in reasoning efficiency! [image]
-
@sama
Sam Altman
on x
This is our first model that hits “high” for cybersecurity on our preparedness framework. We are piloting a Trusted Access framework, and committing $10 million in API credits to accelerate cyber defense. https://openai.com/...
-
@gdb
Greg Brockman
on x
gpt-5.3-codex — smarter, faster, and very capable at tasks like making presentations, spreadsheets, and other work products. Codex becoming an agent that can do nearly anything developers and professionals can do on a computer. [image]
-
@sama
Sam Altman
on x
It was amazing to watch how much faster we were able to ship 5.3-Codex by using 5.3-Codex, and fore sure this is a sign of things to come.
-
@sama
Sam Altman
on x
I love building with this model; it feels like more of a step forward than the benchmarks suggest. Also you can choose “pragmatic” or “friendly” for its personality; people have strong preferences one way or the other!
-
@marvinvonhagen
Marvin von Hagen
on x
“GPT-5.3-Codex is our first model that was instrumental in creating itself.”
-
@natolambert
Nathan Lambert
on x
“Due to GPT-5.3-Codex being so different from its predecessors, the data from alpha testing exhibited numerous unusual and counter-intuitive results” Sounds worth giving a go. Big changes are good.
-
@sama
Sam Altman
on x
GPT-5.3-Codex is here! *Best coding performance (57% SWE-Bench Pro, 76% TerminalBench 2.0, 64% OSWorld). *Mid-task steerability and live updates during tasks. *Faster! Less than half the tokens of 5.2-Codex for same tasks, and >25% faster per token! *Good computer use.
-
@openaidevs
@openaidevs
on x
GPT-5.3-Codex is our first model that was instrumental in creating itself. The Codex team used early versions to debug training, manage deployment, and diagnose test results and evaluations, accelerating its own development.
-
@kimmonismus
@kimmonismus
on x
GPT-5.3 codex!! What a day!!
-
@synthwavedd
Leo
on x
THEY RELEASED 5.3 CODEX THE SECOND OPUS 4.6 DROPPED LMAO [image]
-
@danielkarunaa
Daniel
on x
aaaaand gpt-5.3-codex in codex cli now! great timing (v0.98.0) [image]
-
r/singularity
r
on reddit
OpenAI released GPT 5.3 Codex
-
@nvidianewsroom
@nvidianewsroom
on x
OpenAI's new GPT-5.3-Codex was co-designed for, trained with, and is served on NVIDIA GB200 NVL72 systems, accelerating the frontier of AI. We're excited to see what developers build next with this breakthrough in code intelligence.
-
r/accelerate
r
on reddit
GPT-5.3 Codex is out now, minutes after Opus 4.6
-
@sarahwooders
Sarah Wooders
on x
Not available on the API in the name of “safety” (classic OpenAI), so impossible to properly evaluate or try out I'll be sticking to Opus 4.6 [image]
-
@timkellogg.me
Tim Kellogg
on bluesky
GPT-5.3-Codex — Cheaper (fewer tokens, higher intelligence) — you can interrupt it — big focus on coding — first LLM to be used extensively in its own development — openai.com/index/introd... [image]