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The post argues frontier-model release cycles have compressed to roughly 2–3…

2026-02-05 · 19:07 UTC ·kimmonismus ·2 min read

Brief

Kimmonismus argues that leading AI labs are accelerating both model release cadence and capability gains, with Anthropic and OpenAI shipping major updates within weeks of each other in late 2025 and early 2026. The post emphasizes practical advances beyond benchmark scores, including Anthropic’s 1 million-token Opus 4.6 and OpenAI’s GPT-5.3-Codex, whose reported token-efficiency, inference-speed, and self-assistance in training and deployment suggest increasingly recursive model development.

Why it matters

The post argues frontier-model release cycles have compressed to roughly 2–3 months, citing Anthropic Opus 4.5 on November 24, 2025, OpenAI GPT-5.2 Codex on December 18, 2025, and additional launches by early February 2026.

Key details

  • Anthropic’s Opus 4.6 is described as expanding to a 1 million-token context window and improving long-running agentic coding work by operating in massive codebases, catching its own mistakes, and extending workflows into PowerPoint and Excel.
  • OpenAI researcher Noam Brown highlighted GPT-5.3-Codex for better token efficiency and faster inference, while OpenAI said early versions of the model helped debug its own training, manage deployment, and diagnose evaluations, which the author frames as a step toward self-improving models.
Source evidence

title: @kimmonismus: Release intervals are getting shorter. While Opus 4.5 was released on November 2...
author: kimmonismus
contenttype: twitterarticle
published: 2026-02-05T19:07:32+00:00
source_url: https://x.com/kimmonismus/status/2019488076796686621

word_count: 361

Release intervals are getting shorter. While Opus 4.5 was released on November 24th, the GPT-5.2 cod

Release intervals are getting shorter. While Opus 4.5 was released on November 24th, the GPT-5.2 codex was released on December 18th, 2025. It's now early February, so release intervals are shrinking to 2-3 months. And within those 2 months, we're seeing significant performance improvements.

That alone would be significant enough, considering the evaluations, which will not be discussed in detail here.

Much more significant is what comes with the additional features in the releases. Anthropic, for example, increased the context window of Opus 4.6 to 1m, "sustains agentic tasks for longer, operates reliably in massive codebases, and catches its own mistakes." In addition, Anthropic extends the use case of its models to PowerPoint and improves their use in Excel - almost as an afterthought.

(ARG-AGI-2 is not even 12 months old)

Even more exciting, however, are the developments at OpenAI. The rivalry between Anthropic and OpenAI has famously intensified recently, and Anthropic's release of its anti-ad YouTube videos was a clear dig at OpenAI. Therefore, it was certainly no coincidence that both major AI companies released their latest models almost simultaneously on the same day.

But OpenAI also has a few tricks up its sleeve.

OpenAI researcher Noam Brown sums it up perfectly:

"GPT-5.3-Codex's much better token efficiency AND faster inference is the biggest story of this release."

https://x.com/polynoamial/status/2019476535044948419?s=20

But the real magic can only be found in OpenAI's blog post about the GPT-5.3 codex, presented in a completely unpretentious way:

"GPT-5.3-Codex is our first model that was instrumental in creating itself. The Codex team used early versions to debug its own training, manage its own deployment, and diagnose test results and evaluations ."

We recently heard a similar announcement from Anthropic, namely that Opus 4.5 delivered all the code for Claude Code, but OpenAI is going a step further.

It's certainly not presumptuous to say that we are entering the era of self-improving models and can expect that the intervals between releases will either decrease even further or - if the intervals remain the same - that even better models will be released within just a few months.

From here on out, it will only get faster - and better.

Posted: 2026-02-05T19:07:32.000Z

Engagement: 887 likes, 61 retweets, 9 replies