Test: GPT-6.1 Sol matches GPT-6 Astra at 18% of the cost

OpenAI launched GPT-6.1 Sol on September 29, a week after GPT-6 Sol, marketing it as "near-Astra intelligence for a fifth of the price." In independent testing across three tasks — CI triage, incident log analysis and writing a dependency resolver — GPT-6.1 Sol tied Astra on accuracy, ran faster on the two longer tests and cost $2.66 versus Astra's $14.77.

• Pricing: $2 per 1M input and $10 per 1M output tokens vs Astra's $10 and $50
• Cached input halved from GPT-6 Sol's $0.20 to $0.10
• All 15 runs across three tests passed with no errors for both models
• Total test cost: $2.66 for GPT-6.1 Sol vs $14.77 for Astra, or 18%