Frontier Models
Closed-model performance watch
Provider APIs + benchmark watchlists + vendor docs
OpenAI
GPT-5.5
OpenAI lane is now sourced from the live OpenAI API catalog. The site promotes the newest available GPT family model first and keeps the previous static GPT-5.4 entry only as historical fallback context.
Catalog source
Live API
Internal rank
ELO 1990
Context
1M
Model family
GPT
Anthropic
Claude Opus 4.7
Anthropic lane now tracks the official Anthropic fallback seed. Claude Opus 4.7 is treated as the current flagship fallback and is replaced automatically when the configured Anthropic Models API returns a newer Opus-family model.
Catalog source
Fallback
Internal rank
ELO 1907
Context
1M
Max output
128k
Gemini 3.1 Pro Preview
Best current Artificial Analysis intelligence score and a top-three Arena text position, making it a strong general frontier benchmark.
AA intelligence
57
Arena overall
#3
Coding
#3
Creative
#2
Longer query
#3