---
title: "Sergiusz Kierat (@sergiusz-kierat)"
description: "Rank #1579 of 2498 on the Paradev leaderboard, tier 1."
canonical: https://paradev.com/sergiusz-kierat
last-updated: 2026-10-26
---

# Sergiusz Kierat (@sergiusz-kierat)

Rank #1579 of 2498 on the Paradev leaderboard, tier 1.

URL: https://paradev.com/sergiusz-kierat

## Standing

- Rank: #1579 of 2498
- Tier: Button pusher
- Tokens: 5.80B all time
- Cost: $3710.16 API-equivalent
- Sessions: 811
- Tracking: 2026-07-29 to 2026-10-26

## How this tier was reached

Tier is a weighted score across the axes measured for you, so a strong axis offsets a weak one. Operator needs a higher combined score, and cost also caps the tier on its own.
Scored on 5 axes, measured over the trailing 30 days.

| Axis | Current | Needed | Met | Measures |
| --- | --- | --- | --- | --- |
| width | 1.0 | 3.1 | no | agents running at once |
| depth | 3.6M | 10.4M | no | tokens per session |
| output | 4.0 | 2.1 | yes | agent PRs merged per week |
| sustain | 21 | 17 | yes | active days in the last 30 |
| cost | $38.21 | <= $315.60 | yes | USD per merged PR, lower is better |

## Achievements

- **efficient** (level 2 of 3) at $300, earned 2026-09-07
- **ship-it** (level 1 of 4) at 1, earned 2026-09-07
- **whole-task** (level 1 of 3) at 2.5M, earned 2026-09-07

## Milestones

- sessions: 100
- spend: 1.0K
- tokens: 1.00B

## Contributions

- Active days in the last year: 57
- Busiest day: 2026-08-04 at 359.1M tokens

## Models

| Provider | Model | Tokens | Cost |
| --- | --- | --- | --- |
| claude | claude-opus-5 | 4.16B | $3040.35 |
| claude | claude-sonnet-5-5 | 1.27B | $408.05 |
| claude | claude-opus-5-5 | 168.9M | $135.25 |
| claude | claude-sonnet-5 | 149.8M | $75.95 |
| cursor | cursor-grok-4.6-high-fast | 33.9M | $40.53 |
| claude | claude-haiku-4-5-20251001 | 11.7M | $2.84 |
| codex | gpt-5.6-sol | 6.2M | $4.41 |
| claude | claude-haiku-5-5 | 2.5M | $1.91 |

## Token breakdown

- Uncached input: 2.5M
- Cached input: 5.66B
- Cache write 5m: 20.6M
- Cache write 1h: 94.3M
- Output: 20.2M
- Reasoning output: 5.6M

Published voluntarily by the account holder. Source: https://paradev.com/sergiusz-kierat