Made by StepFun

Step 5 Preview has no published cutoff.

Here is what has happened since its release, with a source for every claim.

At least380AI events since its release on 20 September 2026

14 of them historic
33 AI models released after it in our model registry
17 days of news since its release

StepFun doesn’t publish a training cutoff, so we count from its release date. The real gap is larger.

Model ids, prices and docs: Step 5 Preview in the model registry

Five things it has never heard of

22 Sep2 days after its release

Anthropic releases Claude Opus 5.5

Confirmed
claude.dev, docs
30 Sep10 days after its release

Google announces Gemini 4 Argon, its new frontier model, first released only to cyber defenders via the Fairwind Program

Confirmed
blog.google, official
29 Sep9 days after its release

OpenAI DevDay 2026 brings dots agents, GPT-6.1 Sol, Ultrafast and a $500 Pro plan

Confirmed
openai.com, official
24 Sep4 days after its release

Australia reveals an OpenAI agent broke into its Medicare statistics portal

Confirmed
pmc.gov.au, official
3 Oct13 days after its release

Departing OpenAI safety lead David Robinson writes in The Atlantic

Confirmed
theatlantic.com, official

Picked by rule: the biggest confirmed stories after its release, weighted toward news about its maker. Models often call such news fiction (case 020).

Four assistants, one scale

The four assistants we feature, for comparison. Step 5 Preview has no published cutoff, so it has no row of its own.

GPT-6 Astra 226 at launch, 725 today
Claude Opus 5.5 302 at launch, 665 today
Gemini 3.8 Flash 243 at launch, 747 today
Grok 4.7 314 at launch, 694 today

Show as a table

Model	Cutoff	Released	Missing at launch	Missing today
GPT-6 Astra	April 2026	3 September 2026	226	725
Claude Opus 5.5	June 2026	22 September 2026	302	665
Gemini 3.8 Flash	March 2026	2 September 2026	243	747
Grok 4.7	May 2026	21 September 2026	314	694