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Epoch AI's model tracker shows OpenAI's GPT- Sol, released on 29 September 2026 at $10 per million output tokens, reaching a best score of on FrontierMath Tier 4 (v2), Epoch's set of exceptionally difficult research-level maths problems OpenAI's GPT-6.1 Sol scored 100% on FrontierMath's hardest research-maths tier
Verified 2026-10-28
Track with InsiderWhy it matters
A benchmark built to resist AI for years is now maxed out by a lower-priced model, so frontier maths ability is getting cheap and new yardsticks are needed.
The screener · 72 companiesEvery layer of the AI chain, priced dailyHow this was verifiedEvery figure links to the filing it came from
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