Bird Session

Penny loss✓ Verified run (measured in the hosted demo)Oct 4, 2026

Penny cost more

Claude Code 2.1.289claude-sonnet-5-5Native Penny

Cost+$0.002

+3%

Penny 3% more expensive

Native

$0.070Penny

$0.071

Tokens−23.2k

−29%

Penny 29% fewer tokens

Native

79.4kPenny

56.2k

Model calls−1

−17%

Penny 17% fewer calls

Native

6Penny

Native

birds.html

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Penny

artifacts/36bc9101-4a0e-42f5-9185-60b16a227aca.html

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Session Details

	Native	Penny
Model	claude-sonnet-5-5	claude-sonnet-5-5
Model calls	6	5
Cache read	63.3k	43.5k
Cache write	12.7k	7.7k
Fresh input	997	764
Output	2.4k	4.3k
Total tokens	79.4k	56.2k
Background calls	claude-sonnet-5-5 ×1, claude-haiku-4-5-20251001 ×1	claude-sonnet-5-5 ×1, claude-haiku-4-5-20251001 ×1
Cost	$0.070	$0.071

Costs are API-equivalent estimates at Standard prices, including the main conversation, subagents and background calls such as titles and the auto-mode reviewer.