Solar Open 2 grows to 250B parameters while cutting total training tokens
keunwoochoi · x · 2026-07-26
- Solar Open 2 is described as a 250B sovereign LLM from South Korea, and the author says it is 2.5× larger than Solar Open 1 while using fewer total training tokens.
- The post highlights a four-stage post-training recipe: supervised fine-tuning, multi-domain RL, specialist training, and multi-teacher on-policy distillation.
- The paper also claims selective weight transfer from Solar Open 1, a 10T-token general pre-training stage, a 1T intensive stage, and Korean officework data curation for domain-specific performance.
Related event: Upstage Releases Solar Open 2: A 250B Sovereign LLM(6 posts)→
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