Anthropic

Sonnet 4.5 Pricing

The best balance of cost and capability in the Claude family. The default choice for most production agent systems.

Token Pricing

Last updated: March 2026

Input (per 1M tokens)

$3.00

Output (per 1M tokens)

$15.00

Production agent systemsMulti-step reasoningCode generation agentsComplex tool orchestration

Light (50 convos/day)

5 turns/convo

$135-270/mo

Medium (500 convos/day)

5 turns/convo

$1,350-2,700/mo

Heavy (5K convos/day)

5 turns/convo

$13,500-27,000/mo

3x more expensive than Haiku but much stronger reasoning. The sweet spot for most agent workloads.

Similar capability. Sonnet is 20% more expensive on input but 50% more on output. Choose based on your framework preference.

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