Another perspective on the question.
Sonnet joins Luna and Haiku in Deep Research. Keep every model’s full response alongside the final answer.
Ithy Pro
For questions worth a deeper look.
Three independent AI researchers. A detailed answer you can inspect, save and use.
$20/month or $120/year. Choose your plan in your account.
Three perspectives
ChatGPT6 Luna
ClaudeHaiku 5.5
ClaudeSonnet 5.5
ChatGPT6 LunaClaudeHaiku 5.5ClaudeSonnet 5.5One combined answerWritten by ChatGPT 6.1 Sol
Linked sourcesFull perspectivesYour library
More room for your research.
1,000 answers each month and questions up to 100,000 characters. Bring the context your question needs.
Research that stays useful.
Explore broader web evidence, organize your library and export answers to use beyond the conversation.
Choose how far you want to explore.
Start free. Make more room when you need it.
Start exploring
Standard
$010 answers each month with a free account.
- Fast Research: one researched Haiku answer
- Deep Research: two independent perspectives
- Haiku combines your final article
No payment details needed. You can also try Ithy as a guest.
Ithy Pro
More room to explore.
$20 / monthOr $120/year, billed annually. Save 50% compared with monthly billing.
- Three independent researchers in Deep Research
- ChatGPT 6.1 Sol combines the final article
- Broader web evidence and 1,000 answers a month
- Questions up to 100,000 characters
Checkout confirms your offer, taxes and renewal price. Existing memberships keep their terms.
Included on both plans: sources, available pictures and videos, writing preferences, saved answers, folders and exports. Fast Research works the same way on both plans.
A few things you might be wondering.
What changes with Pro?
Pro Deep Research adds a third independent researcher, Claude Sonnet 5.5, and uses ChatGPT 6.1 Sol to combine the final article. Pro also includes broader web evidence, 1,000 answers each month and a larger question limit. Fast Research uses the same researched Haiku answer on both plans.
How does annual billing work?
Monthly is $20 per month. Annual is $120 charged for a year, equivalent to $10 per month. Your checkout shows any taxes and the renewal terms before you confirm.
What happens to my saved research?
Your saved answers, full model perspectives, folders and exports stay with your account. Changing your membership does not delete your research.
What if I already have a membership or trial?
Your existing paid-through, discounted, prepaid, manual or lifetime terms remain in place. Manage renewals and receipts in your account. A trial starts only if you choose an eligible offer in checkout.