Step 3.5 Flash 2603 just shipped!
Low mode: 56% fewer tokens
High mode: full reasoning, still 14% leaner than before
Agentic workflows make hundreds of calls—most don't need deep thinking.
Not every call needs to be a philosophy session. Now you can dial it down.
Live for all Step Plan users.
https://t.co/lmZtnHwSTb
token — The chunk of text a model reads and writes in — roughly three-quarters of a word — and the unit AI usage is billed in.
AI agent — An AI system that doesn't just answer once but works toward a goal in a loop — taking actions, reading the results, and deciding what to do next.
Why it matters
The 2603 checkpoint adds a low reasoning mode using 56% fewer tokenThe chunk of text a model reads and writes in — roughly three-quarters of a word — and the unit AI usage is billed in.Full definition →, with high mode still 14% leaner, aimed at AI agentAn AI system that doesn't just answer once but works toward a goal in a loop — taking actions, reading the results, and deciding what to do next.Full definition → loops that make hundreds of shallow tool calls.
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