Benchmark AI_TRUECOST_

real AI cost, not vanity metrics

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claude-opus-5

Running claude-opus-5 inside cursor.

FastAPI: Add POST /api/v1/projects/{project_id}/tasks endpoint Plan → Review plan → Execute → Review & fix → Open PR → Verify PR → Verify e2e

All steps run as one workflow, inside a single Docker container.

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5 of the 10 steps are agent sessions, each started fresh: only the repository working tree and the previous step's output carry over. Host steps orchestrate and verify, and cost nothing.
# Step Kind What happens
1 pullIssue host Fetches the GitHub issue and creates a branch
2 plan agent Drafts a plan from the ticket, including tests
3 reviewPlan agent Always runs; returns the full final plan
4 execute agent Implements the landing page; may run repeated preview captures; no harness step timeout
5 reviewAndCorrect agent Visual review against the brief and reference render; fixes layout and copy; no harness step timeout
6 openPullRequest agent Commits, pushes, opens a pull request into main
7 verifyPullRequest host Checks that the exact pull request is open
8 verifyPullRequestCheck host Waits for the required end-to-end check to pass
9 summarizeUsage host Totals tokens and cost
10 score host Records the final result
Speed
Reasoning
Run 1 2026-09-10 · standard · high $4.10 PASS

Steps

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Agent steps start a fresh session. Host steps are included in the run cost.
Step Status Cost Time In tok Out tok Tools
pullIssue succeeded $0.00 — 0 0 0
plan succeeded $0.62 2m 00s 14 7,986 26
reviewPlan succeeded $0.43 1m 38s 16 7,369 24
execute succeeded $1.56 4m 26s 62 19,816 46
reviewAndCorrect succeeded $1.12 3m 31s 32 14,214 19
openPullRequest succeeded $0.37 1m 12s 22 3,193 10
verifyPullRequest succeeded $0.00 0m 01s 0 0 0
verifyPullRequestCheck succeeded $0.00 0m 22s 0 0 0
summarizeUsage succeeded $0.00 — 0 0 0
score succeeded $0.00 — 0 0 0

Run totals

Cost
$4.10
Agent time
12m 47s
Input tokens
146
Output tokens
52,578
Cache-read tokens
3,428,693
Tool calls
125

Tool call mix

read
62
shell
39
edit
18
glob
4
createPlan
2