# FrontierCode v1.1 (Extended) (extended split) — AI model rankings

frontier-difficulty agentic coding tasks (v1.1, extended split)

10 tracked models have a published FrontierCode v1.1 (Extended) (extended split) score. Higher is better. Scores come from published lab reports and benchmark sources; recorded sources appear beside the scores.

## Ranking

| Rank | Model | Developer | Score | Source | Released |
| --- | --- | --- | --- | --- | --- |
| 1 | Claude Opus 5.5 | Anthropic | 65.3% | Lab | Sep 22 2026 |
| 2 | Claude Fable 5 | Anthropic | 64.9% | Lab | Jun 9 2026 |
| 3 | GPT-6 Astra | OpenAI | 64.5% | Lab | Sep 3 2026 |
| 4 | Claude Sonnet 5.5 | Anthropic | 64.4% | Lab | Sep 28 2026 |
| 5 | Claude Opus 5 | Anthropic | 63.6% | Lab | Jul 24 2026 |
| 5 | Claude Fable 5.1 | Anthropic | 63.6% | Lab | Sep 1 2026 |
| 7 | Grok 4.6 | SpaceXSI | 61.3% | Lab | Aug 12 2026 |
| 8 | Claude Opus 4.8 | Anthropic | 59.6% | Lab | May 28 2026 |
| 9 | Claude Haiku 5.5 | Anthropic | 58.4% | Lab | Oct 7 2026 |
| 10 | Grok 4.5 | SpaceXSI | 56.6% | Lab | Jul 8 2026 |


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Canonical page: https://aireleasetracker.com/benchmark/frontiercode-1.1-extended
Site index: https://aireleasetracker.com/llms.txt
Source: AI Release Tracker (https://aireleasetracker.com). Most benchmark scores come from lab launch material; gathered results identify the leaderboard that published them.