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1•11/01/2026, 19:35•2 min read

OpenAI Reportedly Tests GPT-6.2 Astra as Anthropic's Mythos 5.5 Surfaces

OpenAI Reportedly Tests GPT-6.2 Astra as Anthropic's Mythos 5.5 Surfaces
Executive TL;DR30s read

A separate gpt-6.2-astra entry appeared in some Codex usage statistics, while the public model list still shows GPT-6 Astra; meanwhile, a Mythos 5.5 reference was noticed on Anthropic's site.

OpenAI is reportedly testing GPT-6.2 Astra in secret. Early traces of the new model were noticed in Codex usage statistics.

The public list of available models still shows GPT-6 Astra, but some users have separately seen gpt-6.2-astra in usage stats.

Anthropic seems unable to let OpenAI stay in the spotlight for even a day without trying to pull attention toward itself. As soon as the first mentions of GPT-6.2 Astra appeared, a reference to Mythos 5.5 mysteriously surfaced as well.

Anthropic page mentioning Mythos

For now, these observations are not official announcements, but they may point to early experiments with the next generation of models.

Why it matters

Analysis

It may indicate early experiments with OpenAI's next-generation models and the competitive pace of the AI industry, where traces of testing often appear in interfaces before official releases.

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