Harness-bench with e2b and herdrdev
Compare Claude Opus 5 vs Codex GPT 5.6 Sol performance when debugging an ambiguous parsing edge case. Give each its own E2B sandbox, so you can spin up as many harness evals as you want in parallel. Results we got from our run: - Opus used
Opus 5 (Extra high)
Procedural Three.js TSL forest FPS prototype (Vite + WebGPU, zero external assets) Light and shadow look better than Grok 4.6? • 195M tokens (97.3% cache) • $160.59 official Build cost • 6h 48m active agent time
Anthropic says Claude's text watermark applies to models launched on or after August 2, 2026.
Every selectable model, including Opus 5, launched before that. Detection tooling is still forthcoming, so nobody can verify the GitHub removal tools.
Your claude limit doesn’t die on message 30.
It dies rereading messages 1–29. every time you hit send, Claude processes the conversation again. that’s why a long chat gets more expensive even when your prompts stay short. 10 ways to stop feeding the loop: turn PDFs into
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