Pick a winner in each dimension — change your vote anytime.
Pricing and capabilities synced from the OpenRouter catalogue. Scores are editorial (0–10).
Choose GPT-5.5 if you want hard reasoning and coding for teams in the OpenAI ecosystem. Choose MiniMax M2.1 if you want tool-heavy personal and autonomous agents on a budget.
In our editorial scoring, GPT-5.5 leads in 3 of five dimensions (output quality, agentic ability and reliability), while MiniMax M2.1 leads in 2. On price, GPT-5.5 runs about $13 per 1M tokens (blended) and is proprietary; MiniMax M2.1 is about $0.49 and open-weight.
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.