Frontier Models
Closed-model performance watch
Provider APIs + benchmark watchlists + vendor docs
OpenAI
GPT-5.5
OpenAI lane is now sourced from the OpenAI Models API Auto-Sync (2026-06-12). 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 Fable 5
Anthropic lane now tracks the OpenRouter Catalog Auto-Sync (2026-06-12). The newest Claude family flagship is promoted automatically as soon as it appears in the synced catalog.
Catalog source
Live API
Internal rank
ELO 1875
Context
1M
Max output
64k+
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