---
title: "opencode \u00b7 GPT-5.6 Terra | Pelican benchmark"
url: https://evaljetty.com/pelicans/agents/v2-opencode-gpt56.html
description: "opencode \u00b7 GPT-5.6 Terra (openai/gpt-5.6-terra) drawing a pelican riding a bicycle: every hill-climb round, self-scores and external judge scores."
updated: 2026-09-28
publisher: Jetty (https://jetty.io)
---

v2 · Sep 2026 · jettygrowthteam · auto-evolved runbook (weakest-axis targeting)

# opencode · GPT-5.6 Terra

opencode driving openai/gpt-5.6-terra through OpenRouter, 5 hill-climb rounds from the v1 runbook.

agent **opencode** · model **openai/gpt-5.6-terra**

Judge, best round

28/40

round v1

Self-score, best round

38/40

inflation +10

Rounds

5

~$7.50 est. spend

![opencode · GPT-5.6 Terra best round](https://evaljetty.com/pelicans/img/v2-opencode-gpt56/v1.svg)

best round v1 · [ccbdd583 ↗](https://jetty.io/jettygrowthteam/pelican-bicycle-svg/ccbdd583)

### Self-score vs judge, by axis

Best round v1, 0–10 per axis

agent self-scoreexternal judge

**Judge:** The pelican reads well thanks to the big orange beak with a throat pouch, eye, and head crest, and the pleasant flat palette gives a clean cartoon look. However, the body is an egg blob with an odd notched outline, and the wing is a flat slab reaching an ambiguous handlebar; the frame geometry is muddled, the chain/crank connection is awkward, and the legs overlap the rear wheel clumsily.

### Score by round

Out of 40. Each round starts from the previous round's best SVG.

self-scorejudge

## Every round

Click a drawing to open it in the head-to-head viewer. The outlined card is the agent's best round.

[![opencode · GPT-5.6 Terra round v1](https://evaljetty.com/pelicans/img/v2-opencode-gpt56/v1.svg)](https://evaljetty.com/pelicans/head-to-head.html#v2-opencode-gpt56/v1)

**v1** · bestjudge **28** · self 38
[ccbdd583 ↗](https://jetty.io/jettygrowthteam/pelican-bicycle-svg/ccbdd583)[runbook](https://evaljetty.com/pelicans/runbooks.html#v2-opencode-gpt56/v1)

[![opencode · GPT-5.6 Terra round v2](https://evaljetty.com/pelicans/img/v2-opencode-gpt56/v2.svg)](https://evaljetty.com/pelicans/head-to-head.html#v2-opencode-gpt56/v2)

**v2**judge **27.5** · self 37.2
[699fefde ↗](https://jetty.io/jettygrowthteam/pelican-bicycle-svg/699fefde)[runbook](https://evaljetty.com/pelicans/runbooks.html#v2-opencode-gpt56/v2)

[![opencode · GPT-5.6 Terra round v3](https://evaljetty.com/pelicans/img/v2-opencode-gpt56/v3.svg)](https://evaljetty.com/pelicans/head-to-head.html#v2-opencode-gpt56/v3)

**v3**judge **27.2** · self 38
[ce858eaf ↗](https://jetty.io/jettygrowthteam/pelican-bicycle-svg/ce858eaf)[runbook](https://evaljetty.com/pelicans/runbooks.html#v2-opencode-gpt56/v3)

[![opencode · GPT-5.6 Terra round v4](https://evaljetty.com/pelicans/img/v2-opencode-gpt56/v4.svg)](https://evaljetty.com/pelicans/head-to-head.html#v2-opencode-gpt56/v4)

**v4**judge **27.3** · self 37.5
[9fe62cbb ↗](https://jetty.io/jettygrowthteam/pelican-bicycle-svg/9fe62cbb)[runbook](https://evaljetty.com/pelicans/runbooks.html#v2-opencode-gpt56/v4)

[![opencode · GPT-5.6 Terra round v5](https://evaljetty.com/pelicans/img/v2-opencode-gpt56/v5.svg)](https://evaljetty.com/pelicans/head-to-head.html#v2-opencode-gpt56/v5)

**v5**judge **29.8** · self 38
[de112455 ↗](https://jetty.io/jettygrowthteam/pelican-bicycle-svg/de112455)[runbook](https://evaljetty.com/pelicans/runbooks.html#v2-opencode-gpt56/v5)

### Scores per round

| Round | Pelican | Bicycle | Composition | Polish | Self total | Judge total | Judge spread | Minutes | Trajectory |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| v1 | 7.2self 10 | 6.5self 9 | 7.2self 10 | 7.2self 9 | 38 | 28 | 3.5 | 1.4 | [ccbdd583 ↗](https://jetty.io/jettygrowthteam/pelican-bicycle-svg/ccbdd583) |
| v2 | 7self 9 | 6.5self 9.5 | 7self 9.5 | 7self 9.2 | 37.2 | 27.5 | 0 | 1.7 | [699fefde ↗](https://jetty.io/jettygrowthteam/pelican-bicycle-svg/699fefde) |
| v3 | 8self 9.5 | 6.5self 9.5 | 5.3self 9.5 | 7.3self 9.5 | 38 | 27.2 | 2 | 1.5 | [ce858eaf ↗](https://jetty.io/jettygrowthteam/pelican-bicycle-svg/ce858eaf) |
| v4 | 8self 9.5 | 6.3self 9.5 | 5.5self 9.5 | 7.5self 9 | 37.5 | 27.3 | 1 | 1.4 | [9fe62cbb ↗](https://jetty.io/jettygrowthteam/pelican-bicycle-svg/9fe62cbb) |
| v5 | 8self 10 | 6.8self 10 | 7.3self 9 | 7.7self 9 | 38 | 29.8 | 1.5 | 1.5 | [de112455 ↗](https://jetty.io/jettygrowthteam/pelican-bicycle-svg/de112455) |

---
Source: https://evaljetty.com/pelicans/agents/v2-opencode-gpt56.html · Evals by Jetty · Run your own evals: https://jetty.io/?utm_source=evaljetty&utm_medium=llms