Claude Opus 5.5 vs. GPT-6 Sol: Cost per correct task, not price per token (www.aipricing.guru)

On September 22, 2026, Claude Opus 5.5 and GPT-6 Sol were launched, sparking a critical comparison centered around cost per accepted task rather than just price per token. While GPT-6 Sol offers lower rates for various token usages—$2 for input versus Claude Opus’s $4—the effective cost analysis reveals that if Claude Opus requires significantly fewer calls to complete a task, its premium may justify the expense. Anthropic claims Opus 5.5 can be up to 40% cheaper on typical workloads due to its efficiency in terms of token usage, despite being more expensive on a per-token basis. The technical implications of these models point to a nuanced evaluation for users selecting a tool for AI-driven coding tasks. For instance, although Opus 5.5 scored impressively in benchmark tests, it exhibited a higher cost per correct answer in some scenarios when compared head-to-head with GPT-6 Sol. This suggests that organizations must carefully assess their specific use cases, factoring in not only direct costs but also the productivity and success rates associated with each model. This shift in focus from upfront costs to overall task efficiency signals a maturation in the AI/ML landscape, encouraging developers to prioritize the effectiveness of models in practical applications over superficial price comparisons.