---
title: "Isaac Chacko (@isaac)"
description: "Rank #229 of 2498 on the Paradev leaderboard, tier 2."
canonical: https://paradev.com/isaac
last-updated: 2026-10-26
---

# Isaac Chacko (@isaac)

Rank #229 of 2498 on the Paradev leaderboard, tier 2.

URL: https://paradev.com/isaac

## Standing

- Rank: #229 of 2498
- Tier: Operator
- Tokens: 61.11B all time
- Cost: $35034.85 API-equivalent
- Sessions: 3466
- Tracking: 2026-08-17 to 2026-10-26

## Links

- Site: https://isaacchacko.com

## How this tier was reached

Tier is a weighted score across the axes measured for you, so a strong axis offsets a weak one. Plant Manager 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 | 3.0 | 5.5 | no | agents running at once |
| depth | 17.1M | 23.3M | no | tokens per session |
| output | 15.0 | 6.0 | yes | agent PRs merged per week |
| sustain | 29 | 24 | yes | active days in the last 30 |
| cost | $213.38 | <= $104.48 | no | USD per merged PR, lower is better |

## Achievements

- **efficient** (level 2 of 3) at $300, earned 2026-09-15
- **run-01**, earned 2026-09-15
- **ship-it** (level 2 of 4) at 10, earned 2026-09-15
- **two-hands** (level 1 of 3) at 10, earned 2026-09-15
- **whole-task** (level 2 of 3) at 10.0M, earned 2026-09-15

## Milestones

- sessions: 500
- spend: 1.0K
- tokens: 10.00B

## Contributions

- Active days in the last year: 66
- Busiest day: 2026-10-05 at 10.30B tokens

## Models

| Provider | Model | Tokens | Cost |
| --- | --- | --- | --- |
| claude | claude-opus-5-5 | 36.33B | $15537.98 |
| claude | claude-opus-5 | 11.14B | $7944.81 |
| claude | claude-sonnet-5-5 | 4.35B | $1054.62 |
| codex | gpt-6-astra | 3.25B | $5009.84 |
| codex | gpt-6.1-sol | 1.84B | $385.40 |
| claude | claude-fable-5 | 1.81B | $2772.44 |
| claude | claude-fable-5-1 | 1.13B | $1819.06 |
| claude | claude-opus-4-8 | 546.1M | $361.38 |

## Token breakdown

- Uncached input: 122.3M
- Cached input: 59.77B
- Cache write 5m: 321.7M
- Cache write 1h: 720.9M
- Output: 170.1M
- Reasoning output: 40.1M

Published voluntarily by the account holder. Source: https://paradev.com/isaac