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Public story · 2026-03-02 · source-backed
A practitioner ran 1,188 benchmark runs across 3 Claude models (Haiku, Sonnet, Opus) and 10 instruction profiles. Key finding: compression hurts quality for Haiku and Sonnet (Sonnet scored 2.81 points lower with compressed instructions). Only Opus showed marginal improvement, under one point. The total quality spread across all profiles was just 0.6 points on a 100-point scale. Stop compressing your CLAUDE.md files. The researcher open-sourced claude-benchmark for A/B testing system prompts. r/ClaudeAI
Each link below shares sources, entities, or timing with this story.
Claude Code uses Haiku / Shared entities / Same source domain / Shared topic / What happened next
Linked by a graph relationship (Claude Code uses Haiku); both cover CLAUDE, ClaudeAI, Opus, Sonnet; reported by the same outlet (reddit.com).
Claude Code uses Haiku / Shared entities / Shared topic / What happened next
Linked by a graph relationship (Claude Code uses Haiku); both cover Haiku, Opus, Sonnet; overlapping topics (haiku, instruction, opus, point, quality).
Anthropic released Claude / Shared entities / Same source domain / Shared topic / What happened next / Tension
Linked by a graph relationship (Anthropic released Claude); both cover ClaudeAI, Opus, Sonnet; reported by the same outlet (reddit.com).
Claude Code uses Haiku / Shared entities / Shared topic / Earlier coverage / Tension
Linked by a graph relationship (Claude Code uses Haiku); both cover Claude, Opus, Sonnet; overlapping topics (benchmark, claude, opus, sonnet).
Anthropic released Claude / Shared entities / Shared topic / What happened next
Linked by a graph relationship (Anthropic released Claude); both cover Claude, Haiku, Opus, Sonnet; overlapping topics (claude, haiku).
Anthropic released Claude / Shared entities / Shared topic / What happened next / Tension
Linked by a graph relationship (Anthropic released Claude); both cover Haiku, Opus, Sonnet; overlapping topics (haiku, opus, sonnet).
Anthropic released Claude / Shared entities / Same source domain / What happened next / Tension
Linked by a graph relationship (Anthropic released Claude); both cover CLAUDE, ClaudeAI, Sonnet; reported by the same outlet (reddit.com).
Claude Code uses Haiku / Shared entities / Same source domain / Shared topic / What happened next / Tension
Linked by a graph relationship (Claude Code uses Haiku); both cover CLAUDE, ClaudeAI; reported by the same outlet (reddit.com).