Model releases & benchmarks
Introducing GPT-6.1 Sol
GPT-6.1 Sol aims for near-Astra performance on several agentic tasks at much lower cost, while GPT-6 Astra remains the recommendation for the hardest scientific research tasks.
Why it matters: For developers choosing a model for repeated-context agents, the lower cached-input price may make reuse less costly. For the most difficult scientific research tasks, the announcement specifically recommends GPT-6 Astra rather than Sol.