LaunchAI ModelsOctober 3, 2026

GPT-6.1 Sol and Sonnet 5.5 reshape cost-performance frontier

Read original source →latent.space

OpenAI priced GPT-6.1 Sol at $2/$10 per million input/output tokens versus $10/$50 for Astra, reportedly beating GPT-6 Sol by 6.4 points on DeepSWE v1.1. Sonnet 5.5 debuted at #3 (+12.5%) in Agent Arena and ranked #1 in Chat, with Anthropic holding the top three Arena spots.

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