Frontier Models
Closed-model performance watch
Provider APIs + benchmark watchlists + vendor docs
OpenAI
GPT-5.3 Codex
OpenAI lane is now sourced from the OpenRouter Catalog Auto-Sync (2026-09-27). Sourced live via OpenAI Models API & OpenRouter catalog.
Catalog source
Live API
Internal rank
ELO 1961
Context
400K
Model family
GPT
Anthropic
Claude Opus 5.5
Anthropic lane now tracks the OpenRouter Catalog Auto-Sync (2026-09-27). The newest Claude family flagship is promoted automatically.
Catalog source
Live API
Internal rank
ELO 1905
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