Claude Code 工作流程的費用——沒有人計算的扇出成本

# A workflow's cost is not "one task". It is the fan-out.
#
#   workflow_cost = orchestrator_steps x step_cost
#                 + subagents x subagent_steps x step_cost
#
# A step is 25,000 in / 1,200 out — the same sizing used on
# every other cost page here, so these numbers are comparable.
#
#   Claude Sonnet 5      $0.043 / step
#   Claude Haiku 4.5     $0.022 / step
#
# Same job, three shapes:
#
#   one thread, 20 steps, all Sonnet
#     = 20 x $0.043 = $0.868
#
#   5 subagents x 8 steps + 6 orchestrator steps, all Sonnet
#     = 46 x $0.043 = $2.00
#
#   same fan-out, subagents on Haiku, orchestrator on Sonnet
#     = 40 x $0.022 + 6 x $0.043 = $1.13
#
# The fan-out costs more than the single thread. Mapping the fan-out
# to the cheap tier is what buys most of it back.

# The one line that changes every workflow run: the tier the
# background and sub-task work lands on.

export ANTHROPIC_BASE_URL=https://api.kunavo.com
export ANTHROPIC_AUTH_TOKEN=sk-kn-...
export ANTHROPIC_MODEL=claude-sonnet-5                # orchestration
export ANTHROPIC_DEFAULT_OPUS_MODEL=claude-opus-5-5   # agents that ask for opus
export ANTHROPIC_DEFAULT_SONNET_MODEL=claude-sonnet-5 # agents that ask for sonnet
export ANTHROPIC_DEFAULT_HAIKU_MODEL=claude-haiku-4-5 # the fan-out