Opus 5 vs GPT-5.6 Sol Tested in Browser Agent: GPT Wins Big on Cost
PrajwalTomar_ · x · 2026-07-26
In a head-to-head test using the browser automation agent Hyperagent, Anthropic's Opus 5 and GPT-5.6 Sol demonstrated distinct strengths and trade-offs.
- Opus 5: Delivers clearer writing and excels at reviewing complex data to justify decisions. However, it acts more like a "rule follower," taking fewer creative risks, and tends to be verbose unless explicitly instructed otherwise.
- GPT-5.6 Sol: Proved to be highly capable across five real-world test cases while maintaining a consistently much lower operational cost per run than Opus 5.
Evaluating models through real agent workflows with transparent cost metrics offers far more actionable insights for developers than traditional leaderboards.
Related event: Opus 5 vs GPT-5.6 Sol: Capabilities Converge, Cost and Style Define Choices(7 posts)→
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