GPT-6.1 Sol and Claude Sonnet 5.5: same $2/$10 price, no shared benchmark

OpenAI launched GPT-6.1 Sol on September 29, 2026, a day after Anthropic's Claude Sonnet 5.5. Both cost $2 per million input tokens and $10 per million output tokens, but neither vendor compared them directly: OpenAI pits Sol against Opus 5.5, Anthropic pits Sonnet 5.5 against GPT-6 Sol.

• Both models cost $2 per 1M input and $10 per 1M output tokens
• GPT-6.1 Sol cache reads cost $0.10 vs $0.20 for Sonnet 5.5 per 1M
• Prompts over 272K tokens on Sol are billed at $4/$15 for the whole request
• Sonnet 5.5 outputs 138 tokens/s vs 76 for GPT-6 Sol at max effort