For Hermes Agent, compare real token cost—not list price
, Sonnet 5, and GPT-5.6 Terra launched on July 9, 2026, as candidates for handling about 80% of an agent’s everyday work. Muse costs $1.25 per million and $4.25 per million , and it is Meta’s first paid model. Sonnet costs $2 and $10 through August 31, then rises to $3 and $15.
Terra costs $2.50 and $15. All three offer more than one million tokens of context and support tool calling. Muse’s input rate is about 40% below Sonnet’s introductory rate and 50% below Terra’s, but it is a whose hidden are billed at the output rate.
Research, analysis, and multi-step work can therefore cost two to four times the visible output unless the effort setting is managed. Sonnet can use 30–41% more tokens for the same text, so its listed price does not show its full effective cost.
Key points
- Muse has the lowest listed input price of the three models.
- Muse’s hidden can sharply raise the cost of complex work.
- Sonnet’s introductory price ends on August 31 and then increases.
- Sonnet can use 30–41% more tokens for the same text.
- All three support tool calling and more than one million tokens of context.