Intelligence on your terms

From quick questions to deep research. Choose the plan that matches how you think.

Slate
$0 /month

Explore the community. No credit card required.

Get started free
  • Debate Arena (1v1 debates)
  • Predictions (manual)
  • Leaderboards & community
  • No AI chat
  • No AI prediction analysis
Amber
$7 /month

Serious intelligence. Serious value.

Everything in Slate, plus:
  • AI Chat — 50 messages per day
  • Claude Sonnet 4.6
  • AI Prediction Analyst
  • All file types (10 files, 10MB)
  • No extended thinking
Obsidian
$18 /month

For power users and professionals.

Everything in Amber, plus:
  • AI Chat — 100 messages per day
  • Extended thinking
  • Longer responses (16K tokens)
  • All file types (20 files, 25MB)
  • Priority support
Diamond
$150 /month

Maximum intelligence. Our best model.

Everything in Obsidian, plus:
  • AI Chat — 200 messages per day
  • Claude Opus 4.6 (latest)
  • Deep extended thinking
  • All file types (30 files, 50MB)
  • Priority support

Compare all plans

Slate Amber Obsidian Diamond
Price Free $7/mo $18/mo $150/mo
AI Chat — 50/day 100/day 200/day
AI Model — Sonnet 4.6 Sonnet 4.6 Opus 4.6
Extended thinking — — ✓ Deep
AI Prediction Analyst — ✓ ✓ ✓
File uploads — All types All types All types
Debate Arena ✓ ✓ ✓ ✓
Predictions Manual + AI Analysis + AI Analysis + AI Analysis
Leaderboards ✓ ✓ ✓ ✓

Frequently asked questions

Can I switch plans at any time?

Yes. You can upgrade or downgrade your plan at any time. When upgrading, you'll be charged the prorated difference. When downgrading, the change takes effect at the end of your current billing period.

What payment methods do you accept?

We accept all major credit and debit cards through Stripe, as well as PayPal. All payments are processed securely and encrypted.

What happens when I hit my daily message limit?

Your limit resets every 24 hours. If you regularly hit your limit, consider upgrading to a higher tier for more messages. You'll see a clear message when you're approaching your limit.

What is extended thinking?

Extended thinking allows the AI to reason through complex problems step by step before giving you an answer. Higher tiers get deeper reasoning capabilities, which means better answers for math, coding, analysis, and research tasks.

Can I cancel my subscription?

Yes, you can cancel anytime from your account settings. You'll continue to have access to your plan until the end of your current billing period.

What can I do on the free plan?

Free (Slate) users get full access to Debate Arena, Predictions, Leaderboards, and the community. AI-powered features like Chat and Prediction Analysis require a paid plan starting at $7/month.

What's the difference between Sonnet and Opus?

Sonnet 4.6 is Anthropic's latest mid-tier model with near-Opus intelligence — great for coding, analysis, and creative work. Opus 4.6 is the most advanced and intelligent model available, excelling at complex reasoning and deep research. Diamond subscribers get exclusive Opus access.