Benchmark profile
FrontierCode 1.1 Extended
Cognition's 150-task Extended subset of the FrontierCode 1.1 software-engineering benchmark.
Data verifiedBenchmark score on FrontierCode 1.1 Extended — July 29, 2026
BenchLM mirrors the published score view for FrontierCode 1.1 Extended. Claude Opus 5 leads the public snapshot at 63.6% , followed by GPT-5.6 Sol (60.6%) and GPT-5.6 Terra (55.8%). BenchLM does not use these results to rank models overall.
Claude Opus 5
Anthropic
claude-opus-5
GPT-5.6 Sol
OpenAI
gpt-5-6-sol
GPT-5.6 Terra
OpenAI
gpt-5-6-terra
Benchmark score table (4 models)
ScoreThe published FrontierCode 1.1 Extended snapshot places Claude Opus 5 first at 63.6%. The third row is 7.8 points behind. The broader top-10 range is 8.5 points, so many of the published results sit in a relatively narrow band.
4 models have been evaluated on FrontierCode 1.1 Extended. The benchmark falls in the Coding category. This category carries a 20% weight in BenchLM.ai's overall scoring system. FrontierCode 1.1 Extended is currently displayed for reference but excluded from the scoring formula, so it does not directly affect overall rankings.
About FrontierCode 1.1 Extended
Year
2026
Tasks
150 private software-engineering tasks
Format
Repository task completion with maintainer rubrics
Difficulty
Frontier coding-agent quality
BenchLM stores Cognition's published GPT-5.6 scores on FrontierCode 1.1 Extended as display-only evidence. The tasks are private and the results combine a model with the Devin harness, so they are excluded from weighted rankings.
BenchLM freshness & provenance
Version
FrontierCode 1.1 Extended
Refresh cadence
Static
Staleness state
Current
Question availability
Private tasks with public aggregate results
BenchLM uses freshness metadata to decide whether a benchmark should still be treated as a strong differentiator, a benchmark to watch, or a display-only reference. For the full scoring policy, see the BenchLM methodology page.
FAQ
What does FrontierCode 1.1 Extended measure?
Cognition's 150-task Extended subset of the FrontierCode 1.1 software-engineering benchmark.
Which model scores highest on FrontierCode 1.1 Extended?
Claude Opus 5 by Anthropic currently leads with a score of 63.6% on FrontierCode 1.1 Extended.
How many models are evaluated on FrontierCode 1.1 Extended?
4 AI models have been evaluated on FrontierCode 1.1 Extended on BenchLM.
Compare Top Models on FrontierCode 1.1 Extended
Know when it’s worth switching models
The model to choose, the cheaper alternative, and the release we would wait on.
Read a sample issueJoin 2,000+ readers.
One email each week. Unsubscribe anytime.