Benchmark AI_TRUECOST_

real AI cost, not vanity metrics

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gemini-3.8-flash

Running gemini-3.8-flash 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 · default $1.09 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 $0.14 2m 31s 65,816 20,865 28
reviewPlan succeeded $0.20 2m 57s 123,151 25,992 25
execute succeeded $0.32 3m 31s 225,812 14,828 44
reviewAndCorrect succeeded $0.26 2m 59s 153,850 14,231 33
openPullRequest succeeded $0.17 1m 52s 136,483 4,572 29
verifyPullRequest succeeded $0.00 0m 00s 0 0 0
verifyPullRequestCheck succeeded $0.00 0m 11s 0 0 0
summarizeUsage succeeded $0.00 — 0 0 0
score succeeded $0.00 — 0 0 0

Run totals

Cost
$1.09
Agent time
13m 50s
Input tokens
705,112
Output tokens
80,488
Cache-read tokens
3,737,103
Tool calls
159

Tool call mix

read
83
shell
56
edit
9
glob
6
grep
3
createPlan
2