Glimmer Index - Chess - Chess960 - Fixed-engine Rating: leaderboard
Chess960 chess strength against Glimmer Index's fixed engine ladder, using the native unbounded rating rather than an LLM-only Glicko scale. This variant remains separate from the combined rating and the other starting-position protocol. The chess-1 prompts, three-attempt policy, adjudication, 300-ply limit, exact provider/route/effort and native sample/provisional status are retained.
Metric: Fixed-engine chess rating (unbounded). Source: glimmerindex.com. Saturation forecast: Rough model projection: around 2026. 15 models tracked.
Top models
| # | Model | Score | Overall rank |
|---|---|---|---|
| 1 | GPT-6.1 Sol (Glimmer Index Run: codex-gpt-6-1-sol-medium;model=openai/gpt-6.1-sol;provider=codex;route=gpt-6.1-sol;effort=medium;precision=unreported) | 1527 | |
| 2 | GPT-6 Astra (Glimmer Index Run: codex-gpt-6-astra-medium;model=openai/gpt-6-astra;provider=codex;route=gpt-6-astra;effort=medium;precision=unreported) | 1287 | |
| 3 | Claude Opus 5.5 (Glimmer Index Run: claude-opus-5-5-medium;model=anthropic/claude-opus-5-5;provider=claude;route=claude-opus-5-5;effort=medium;precision=unreported) | 1237 | |
| 4 | GPT-6 Sol (Glimmer Index Run: codex-gpt-6-sol-medium;model=openai/gpt-6-sol;provider=codex;route=gpt-6-sol;effort=medium;precision=unreported) | 1135 | |
| 5 | Claude Sonnet 5.5 (Glimmer Index Run: claude-sonnet-5-5-medium;model=anthropic/claude-sonnet-5-5;provider=claude;route=claude-sonnet-5-5;effort=medium;precision=unreported) | 1070 | |
| 6 | Claude Haiku 5.5 (Glimmer Index Run: claude-haiku-5-5-medium;model=anthropic/claude-haiku-5-5;provider=claude;route=claude-haiku-5-5;effort=medium;precision=unreported) | 1062 | |
| 7 | Claude Fable 5.1 (Glimmer Index Run: claude-fable-5-1-medium;model=anthropic/claude-fable-5-1;provider=claude;route=claude-fable-5-1;effort=medium;precision=unreported) | 1030 | |
| 8 | GPT-6.1 Terra (Glimmer Index Run: codex-gpt-6-1-terra-medium;model=openai/gpt-6.1-terra;provider=codex;route=gpt-6.1-terra;effort=medium;precision=unreported) | 1024 | |
| 9 | GPT-OSS-20B (Glimmer Index Run: local-gpt-oss-20b-low;model=openai/gpt-oss-20b;provider=ollama;route=gpt-oss:20b;effort=low;precision=unreported) | 794 | |
| 10 | GPT-6 Luna (Glimmer Index Run: codex-gpt-6-luna-medium;model=openai/gpt-6-luna;provider=codex;route=gpt-6-luna;effort=medium;precision=unreported) | 674 |
Interactive version: theaggregate.ai/benchmark?slug=glimmer-index-chess-chess960-fixed-engine-rating · How It Works · Data refreshed daily, snapshot 2026-11-05.