Claude Code /compact vs /clear (2026): Managing Long Sessions Without Losing Quality

You start a Claude Code session sharp. An hour in, responses get vague. Two hours in, Claude starts contradicting earlier decisions.

It's not Claude getting worse. It's what happens when a context window fills up and nobody manages it.

Full guide at stacknotice.com/blog/claude-code-compact-clear-context-2026

Why sessions degrade

As the context fills, earlier information gets less weight, contradictions between early and late instructions emerge, and Claude has less room to reason. The session that started great ends frustrating.

/compact — compress without losing flow

Summarizes earlier conversation history while keeping recent context intact. Key decisions and agreements are preserved in shorter form.

Use when:

• Session is 45-60+ minutes in
• You're mid-task and don't want to lose context
• Responses are getting shorter or less precise

Preserves: current task state, key agreements, CLAUDE.md conventions
Loses: step-by-step detail from early in the session

> /compact

Claude: Summarized. Here's what I kept:
- Building checkout flow with Stripe
- Server actions for mutations (not API routes)
- Webhook handler done, working on UI next

Ready to continue.

Session continues. No re-explaining needed.

/clear — hard reset

Wipes the conversation completely. CLAUDE.md reloads automatically.

Use when:

• Finished one task, starting something unrelated
• Session went the wrong direction
• /compact isn't enough

Preserves: CLAUDE.md, your project files
Loses: everything from the conversation

The decision

Still on the same task?  →  /compact
New task or wrong direction?  →  /clear

Patterns that help

Front-load context — tell Claude what you're building and the constraints at the start. It carries more weight early in the context.

Break large work into sessions — 4 hours of coding doesn't need one session. Finish the DB layer, /clear, start the API layer fresh.

Use /compact proactively — don't wait for quality to drop. Run it at natural checkpoints.

Reference CLAUDE.md instead of re-explaining — your conventions reload automatically. Don't waste context repeating them.

Extended thinking note

Ultrathink uses 3-5x more context per response. If you use it regularly, run /compact more aggressively — after every 2-3 extended thinking calls.

Full guide with the full decision tree at stacknotice.com/blog/claude-code-compact-clear-context-2026