Arena AI Model Elo History

Why this exists

AI labs frequently update their models post-launch, and users regularly report perceived "nerfs": excessive quantization (to save compute costs), aggressive censorship, or behavioral degradation. This chart plots each flagship's public Elo lifecycle on one timeline, so any such trend would be visible at a glance.

Data is fetched daily from the official Arena AI Leaderboard Dataset on Hugging Face, built from thousands of blind, crowdsourced head-to-head human votes. It's an imperfect lens (see caveats below) but the most consistent long-running signal currently available.

How the chart works

Each lab gets exactly one curve, tracking that lab's highest-rated flagship-eligible model at every point in time, not just the most recently announced one.

• If a lab ships a mid-tier model (e.g. Sonnet) while a higher-tier one (e.g. Opus) still ranks above it, the curve stays on Opus.
• Inference-mode variants (suffixes like -thinking, -reasoning, -high) are merged into the parent so the curve doesn't flip-flop between modes.
• New releases appear as labeled marker points, often with a jump in score.
• Downward trends between releases are visible too, but read the caveats below before treating them as proof.