MAI-Code-1-Flash in Python: 5B Coder Beats Haiku 4.5
Summary
Call Microsoft's June 2 coding model via OpenRouter for cheap, fast refactors.
On June 2, 2026, Microsoft used Build 2026 to ship seven in-house MAI models. The headline for working developers was MAI-Code-1-Flash: a 5-billion-parameter coding model that scored 51.2% on SWE-Bench Pro versus 35.2% for Claude Haiku 4.5, while using roughly 60% fewer tokens on hard tasks. That is the kind of number that changes a build cost spreadsheet.
Even better for builders: Microsoft did not lock it inside Azure. The model is live in the GitHub Copilot model picker today, and the same weights are available behind the OpenAI Chat Completions spec on OpenRouter, Fireworks AI, and Baseten. So you can prototype against a real production endpoint in five minutes, with zero Azure subscription, using the standard openai Python SDK.
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