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Not every question needs the same depth of reasoning. Chat modes let you pick how much thinking Libra does: quick everyday questions, the standard balanced mode, or a slower mode for genuinely complex analysis.
Libra mascot thinking
Mode is per-message, not per-chat. Default for the first prompt, Deep Thinking for synthesis, Fast for a quick summary: one chat, three depths.

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The three modes

ModeWhat it doesWhen to pick it
DefaultBalanced reasoning. The standard mode for most prompts.Anything that’s not specifically simple or specifically complex. The right choice 90% of the time.
Deep ThinkingExtended, slower reasoning that reasons step-by-step before answering.Multi-step legal analysis, contract interpretation across multiple clauses, comparative law questions, complex drafting tasks.
FastQuick, lightweight responses. Trades some reasoning depth for speed.Quick everyday questions: “What does ARG stand for?”, “Translate this clause”, “Summarise this paragraph in two sentences.”

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Switching modes

The mode picker sits to the right of the chat input. The mode is per-message; each turn of a conversation can run in a different mode if you change it.
1

Click the current mode

The picker opens above the input. The active mode is highlighted.Chat mode picker dropdown showing the three options
2

Pick the mode you want

The label updates inline. Your next message will be sent in that mode.
3

Read the label above each response

Libra labels every response with the mode that produced it: “Thinking, Libra”, “Fast, Libra”. Useful for spotting when an answer was run in the wrong depth.

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Picking the right mode

Default is the right answer almost every time. Most contract-review questions, drafting prompts, and research-light analysis sit comfortably here, so when in doubt, leave it where it is. The trade-off between speed and reasoning is tuned for the kind of work most lawyers do most of the time: “what does this clause mean and what’s the risk”, get back a thoughtful paragraph, move on.
If you don’t know which mode to pick, pick Default. Switch only when the answer it gives you actively feels too shallow (Deep Thinking) or too slow for what you’re asking (Fast).
A pattern that works: start in Default for a research question, get the overview, switch to Deep Thinking for a follow-up that requires careful comparison, then switch back to Default (or even Fast) for the short reformat or summary that lands in the email you’re drafting. One click per turn.

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Combining modes with Research

Modes and Research are independent settings; you can combine them.
DefaultDeep ThinkingFast
Research toggle offStandard chat. The workhorse.Slow + thorough chat.Quick chat for transformations.
Research toggle onSourced legal research. Default + Research is the workhorse for everyday research.Slow + thorough sourced research. Reach for it when a research question needs careful synthesis.Pairs poorly. Research itself is slow regardless of the chat mode.
Libra mascot hopeful
Every response is tagged with its mode (“Thinking”, “Fast”). Answer reads thin? Check the tag; a complex question in Fast is the most common cause.

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Next steps

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Research mode

Add sourced legal research to any chat.
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Chat basics

The full chat input walkthrough.