0

FrontierCode

Frontier

Frontier software-engineering benchmark from Cognition; the Diamond split is the hardest tier.

Domain
coding
Published
Jun 2026
Notable for
Hard agentic-coding benchmark used at Claude Fable 5 launch.

Cite

Notes

Only stored in your browser.

Attribution

Leaderboard scores
Anthropic
Attribution policy →

Top score 29.3% by Claude Fable 5 - 3 models reporting (3 frontier)

Score history

3
0%25%50%75%100%Apr 26May 26Jun 26GPT-5.5Claude Opus 4.8Claude Fable 5

Top models

3
FrontierCodeBar chart with 3 bars. Highest value: Claude Fable 5 at 29.3.
3 models

FAQ

What is FrontierCode?
Frontier software-engineering benchmark from Cognition; the Diamond split is the hardest tier.
What is the current top score on FrontierCode?
The top reported score is 29.3% by Claude Fable 5, across 3 models reporting (3 from frontier labs).