GPT-5.5 Pro
OpenAI's max-reasoning Pro tier. Excellent structured reasoning and voice/multimodal product fit when cost is secondary.
When to use it
Hard reasoning tasks, research assistants, and multimodal product surfaces.
Watch-outs
Pro pricing is steep; often not the best $/quality vs mainline GPT-5.5/5.6.
Benchmarks
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.
More from OpenAI
- GPT-5.6 SolAA 59
General frontier reasoning, mixed multimodal apps, and OpenAI ecosystem tooling.
- GPT-5.5AA 51
Default production chat, tools, and mixed workloads on OpenAI.
- GPT-5.4AA 46
Teams already on GPT-5.x infra who need stability over bleeding edge.