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OpenAI and Anthropic Quietly Test GPT-6 Sol and Opus 5.2

OpenAI and Anthropic Quietly Test GPT-6 Sol and Opus 5.2

Just days after the heads of two major AI companies publicly called for slowing down the breakneck pace of development, the industry's internal competition has only heated up. This week, OpenAI and Anthropic quietly began gray-scale testing of their next-generation flagship models.

According to users and technical communities, OpenAI is testing a new model called GPT-6 Sol, while Anthropic has skipped version 5.1 and gone straight to Opus 5.2. The simultaneous moves suggest different strategic bets.

Anthropic's Opus 5.2: A Push for the IPO

Anthropic's Opus 5.2 is currently only available in the Claude Code environment; the web version remains on 5.0. Early testers report major leaps in animation realism, front-end development, and 3D rendering—performance that rivals OpenAI's GPT-6 Astra. Analysts say Anthropic is accelerating testing to build momentum for its upcoming IPO.

OpenAI's GPT-6 Sol: Faster, Cheaper, and a $200 Subscription?

OpenAI's gray-scale test can be spotted by checking the model's knowledge cutoff. If it can answer questions about events from April 16, it's likely on the test channel. Some users say GPT-6 Sol has invested heavily in reinforcement learning and runs extremely fast. One goal: introduce a more cost-effective low-price version and revive the rumored $200 premium subscription. New features could launch this week.

Out with the Old, In with the New

As new models are tested, old ones are being retired. OpenAI has announced that the GPT-5.5 series will be discontinued on October 14. Meanwhile, registration for the annual OpenAI DevDay developer conference is now open, promising more quota benefits and technical support.

Both companies are cautious in their public statements, but the product race is intensifying. As these AI giants push forward, one thing is clear: the competition isn't slowing down anytime soon.

Key Points:

  • OpenAI and Anthropic are secretly gray-scale testing GPT-6 Sol and Opus 5.2, respectively.
  • Anthropic's Opus 5.2 shows major improvements in animation, front-end, and 3D rendering, likely to boost its IPO.
  • OpenAI's GPT-6 Sol focuses on speed and cost, potentially reviving a $200 subscription plan.
  • OpenAI will retire GPT-5.5 on October 14 and has opened registration for DevDay.
  • Despite calls for caution, the AI arms race continues unabated.