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Since April 30, 2026: what GPT-6.1 Sol cannot know

GPT-6.1 Sol was trained on data up to April 30, 2026. Since then, 346 models, APIs and runtimes have reached their end date and packages have shipped 180,663 breaking changes. Code it writes from memory can still use any of them.

Knowledge cutoff April 30, 2026

On this page

The model ID is gpt-6.1-sol, from OpenAI, released September 29, 2026. The endings and the package changes below came after its training data ends, so they are not in what the model learned.

Ended since April 30, 2026

346 models, APIs and runtimes have reached their end date since the cutoff. The newest of each:

AI models

And 315 more on the calendar.

Still ahead

450 end dates are still ahead. Some were announced after the cutoff, so the model may write what they end. The soonest of each:

AI models

APIs

And 420 more on the calendar.

Packages that changed most

Since the cutoff, package versions shipped 180,663 breaking changes, and 34,323 security advisories were published. The packages with the most breaking changes in versions released since:

Check before it writes

Run npx since-dev init in a repository and your coding agent checks a version or a model ID before it writes one, whatever model it runs on. To see what a repository already uses that has ended, scan it, or run npx since-dev inside it.

Knowledge cutoffs are from models.dev (MIT License). A cutoff given as a month is read as that month’s last day.

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claude mcp add --transport http since https://api.since.dev/mcp
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