The highest smartness rating we track (5 of 5), and the maker describes it as strong on large coding projects.
Made by Anthropic, the company behind Claude. Smartness: ★★★★★ (5 of 5) Reads at once: about 1,500 pages 1,000-word essay: $0.03 (about 3 cents) 50-page PDF summary: $0.15 (about 15 cents)
Rated 5 out of 5 at about half the price of Claude Opus 5.5.
Made by Anthropic, the company behind Claude. Smartness: ★★★★★ (5 of 5) Reads at once: about 1,500 pages 1,000-word essay: $0.01 (about 1 cent) 50-page PDF summary: $0.07 (about 7 cents)
Chat, web search, file creation, memory and the Sonnet and Haiku models. Usage limits reset every 5 hours.
Limited; 'there's no fixed message count' (Anthropic). Up to 5 projects. Checked 2026-10-16; free plans can change. See every app's free plan.
What a 100-message chat costs with each pick
The best pick costs $5.25; the budget pick costs $2.62. These are developer prices, so they show relative cost, not your monthly bill.
Bar scale
Claude Sonnet 5.5 (budget pick)$2.62
Claude Opus 5.5 (best pick)$5.25
Show the data as a table
Model
Cost of a 100-message chat
Claude Sonnet 5.5 (budget pick)
$2.62
Claude Opus 5.5 (best pick)
$5.25
Bars use a straight scale: a bar twice as long means twice the cost. Only the two picks above. Source: OpenRouter list prices and the assumptions on How we work.