GPT-6.1 Sol replaces GPT-6 Sol after seven days, achieving near-Astra intelligence levels with a score just 1 point below GPT-6 Astra while costing less than one quarter per task. Pricing remains at $2/$10 per million tokens with improved cache discounts, delivering significant gains across benchmarks including an 8-point jump in AA-Omniscience Accuracy and a 12-point improvement in Terminal-Bench 4.0.
Claude Sonnet 5.5 (High) by Anthropic ranked 4th in Code Arena: WebDev with 1699 points, demonstrating strong cost efficiency at $8 per million tokens and reshaping the performance-cost frontier.