OpenAI and Anthropic released GPT-6 Sol and Claude Opus 5.5 on Sept. 22, 2026, putting two new coding- and agent-focused models in direct competition.
GPT-6 Sol starts at half the standard API price of Opus 5.5, while Claude posts stronger results in several current coding benchmarks. The gap changes once prompts get very large, and the two models also differ in reasoning controls, deployment options, and safeguards.
For teams choosing between them, the better fit depends on how much context a workload uses, how much reasoning it needs, and whether coding, automation, or enterprise controls matter most.
GPT-6 Sol vs Claude Opus 5.5 at a glance
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