MAI-Thinking-1 (Reasoning)

by Microsoft

MAI-Thinking-1 (Reasoning) is a reasoning model from Microsoft, released on June 2, 2026. It ranks #70 of 220 models by Intelligence Score with a score of 32.9.

MAI-Thinking-1 is Microsoft AI's first in-house reasoning model, a 35B-active / ~1T-total parameter sparse Mixture of Experts model (base model MAI-Base-1) trained from scratch without distillation from third-party models. Built with Microsoft's Hill-Climbing Machine pipeline, it was pre-trained on 30T tokens of clean, commercially licensed, human-generated data (plus 3.55T mid-training tokens), then post-trained via reinforcement learning across STEM, agentic coding, and helpfulness/safety specialists consolidated into a single model. It delivers strong mathematical reasoning and software-engineering performance for its weight class, going toe-to-toe with Claude Opus 4.6 on SWE-Bench Pro and reaching 97.0% on AIME 2025. It supports a 256k token context window, function calling, and developer instructions, and is preferred over Claude Sonnet 4.6 in blind human side-by-side evaluations.

Key specs

Compare on the AI leaderboard · All AI models

More models from Microsoft

• MAI-Code-1-Flash (Reasoning) — Microsoft
• MAI-Code-1.1-Flash (Reasoning) — Microsoft
• Phi 4 Reasoning Plus — Microsoft
• Phi 4 Reasoning — Microsoft
• Phi 4 Mini Reasoning — Microsoft
• Phi 4 — Microsoft