GPT-5.5 vs Llama 4 Maverick

Choose GPT-5.5 if you want hard reasoning and coding for teams in the OpenAI ecosystem. Choose Llama 4 Maverick if you want self-hosted agents that want the Llama ecosystem.

In our editorial scoring, GPT-5.5 leads in 3 of five dimensions (output quality, agentic ability and reliability), while Llama 4 Maverick leads in 2. On price, GPT-5.5 runs about $13 per 1M tokens (blended) and is proprietary; Llama 4 Maverick is about $0.28 and open-weight.

The model is half the story — the agent is the other half

The model picks the moves; the agent runs the loop, the tools, and the guardrails. Once you've chosen a model, see which agent gets the most out of it.