Agent Arena says Claude Opus 5 beats GPT-5.6 on test-time scaling, but costs more
infwinston · x · 2026-07-30
A post on Agent Arena highlights test-time scaling results for Claude Opus 5 and GPT-5.6.
Key takeaways
- Opus 5 (High) and Opus 5 (Max) outperform GPT-5.6 Sol (xHigh), but at higher cost
- Opus 5 (Medium) roughly matches GPT-5.6 Sol (xHigh) at about the same cost
- Fable 5 (High) offers the best price/performance trade-off in the comparison
The broader point is that real-world agent cost depends on total task execution, not just per-token pricing, because extra iterations and tool calls quickly raise the bill.
Related event: Agent Arena: Claude Opus 5 Outperforms GPT-5.6 Variants(4 posts)→
More from coding & agent
- theo builds his own visualizer for today's agent models, showing how cheap Luna really is — ivan_bezdomny · 2026-09-23
- Vite+ Hits RC: One Rust-Powered CLI to Replace Your Entire Web Toolchain — cnakazawa · 2026-09-23
- Tesla's in-car Grok agent books trips across Gmail, Calendar and Notion in one command — xiaohu · 2026-09-23
- Tesla's In-Car Grok Assistant Now Executes Cross-App Tasks in One Sentence — xiaohu · 2026-09-23
- Garry Tan says Capy lets him ship PRs much faster than Codex or Claude Code — garrytan · 2026-09-23
- DeskPilot: open-source native Python desktop client for local LLMs with MCP and sandboxed tools — poofph · 2026-09-23