OpenAI's newest reasoning-tier flagship. Extremely close to Claude on AA Index with strong tool use and broad multimodal coverage.
General frontier reasoning, mixed multimodal apps, and OpenAI ecosystem tooling.
Reasoning modes vary widely in latency and cost; pick effort level carefully.
Human preference ranking from blind pairwise chats. Higher is better; top frontier models cluster within ~50–80 Elo.
Artificial Analysis composite across agents, coding, science, and general evaluations (v4.1 weighting).
Percent of real GitHub issues resolved end-to-end. Strong signal for agentic coding usefulness.
PhD-level science questions. Separates frontier reasoning models better than saturated knowledge tests.
Harder multi-choice knowledge/reasoning suite than classic MMLU.
Frontier closed-ended academic difficulty across many domains.
Hard reasoning tasks, research assistants, and multimodal product surfaces.
Default production chat, tools, and mixed workloads on OpenAI.
Teams already on GPT-5.x infra who need stability over bleeding edge.