---
language:
- en
tags:
- agent-trajectories
- osworld
- interface-evolution
---
# Shadow Interface Evolution Trajectories

OSWorld V2 evaluation trajectories from Shadow Interface Evolution: two evolved-variant held-out archives and two independently evaluated seed training/validation archives.

| Archive | Evolution experiment | Variant | Trajectories | Full-credit accuracy | Mean partial score |
| --- | --- | --- | ---: | ---: | ---: |
| prime25v15r4_if-006_trajectories.zip | prime25v15r4 | if-006 | 68 | 17/68 (25.0%) | 0.6240 |
| opus5xover25v15_if-010_trajectories.zip | opus5xover25v15 | if-010 | 68 | 16/68 (23.5%) | 0.5834 |

Each archive contains only `claude_trajectory.jsonl` files, preserving the original evaluation batch and task directory structure. Separate screenshot files, result files, and task-cache artifacts are not included.

Scores use all 68 held-out tasks as the denominator, counting infrastructure failures as zero. Both runs have infrastructure-imputed zeros for tasks 002, 018, and 024. Trajectory presence does not imply a successful or complete task execution.

The if-006 archive combines the original 33-task batch and the remaining 35-task batch. The if-010 archive is from the crossover experiment (`opus5xover25v15`), evaluated in run `20260906T174130Z`.

## opus5xover25v15 seed

`opus5xover25v15_seed_trajectories.zip` contains 40 `claude_trajectory.jsonl` files from the independently evaluated `opus5xover25v15-seed`, preserving the original task directory structure. It covers 25 training tasks and 15 validation tasks; this is not a held-out 68-task baseline. Separate result and screenshot files are not included.

Across these 40 tasks, full-credit accuracy is 4/40 (10.0%) and mean partial score is 0.3135557204. These scores are from the seed records in `shadow_evolution_osworld_v2_opus5xover25v15.db` and are not directly comparable to the held-out scores above. The recorded run uses Qwen3.8-27B through OpenRouter/novita, a 1M context window, and a two-hour per-task time limit.

## prime25v15r4 seed

`prime25v15r4_seed_trajectories.zip` contains 40 `claude_trajectory.jsonl` files from `prime25v15r4-seed`, preserving the original task directory structure. It covers 25 training tasks and 15 validation tasks; this is not a held-out 68-task baseline. Separate result and screenshot files are not included.

Across these 40 tasks, full-credit accuracy is 7/40 (17.5%) and mean partial score is 0.3890158997. These scores are from the seed records in `shadow_evolution_osworld_v2_prime25v15r4.db` and are not directly comparable to the held-out scores above. This seed was evaluated independently of `opus5xover25v15-seed`; their results and trajectories are distinct.

The recorded run uses Qwen3.8-27B through OpenRouter/novita, an effective 1M context window, and no per-task wall-clock limit. Although its saved interface configuration declares `context_window_tokens: 131072`, that field was not wired into Prime during this evaluation, so the model catalog window applied. Other step and runtime termination conditions may still apply.

## qwen_synthetic30v15 (seed and if-001)

`qwen_synthetic30v15_seed_trajectories.zip` and
`qwen_synthetic30v15_if-001_trajectories.zip` contain 38 trajectory files each
from `qwen_synthetic30v15-seed` and its one mutation `qwen_synthetic30v15-if-001`,
preserving the original task directory structure. Alongside the 36
`claude_trajectory.jsonl` files, each archive carries the two retry/phase
trajectories that those runs produced (`claude_trajectory_attempt_2.jsonl`,
`claude_trajectory_phase_1.jsonl`). Separate result and screenshot files and
task-cache artifacts are not included.

This experiment uses a different split from the archives above: 30 **synthetic**
training tasks (`s_001`–`s_030`) plus the same 15 validation tasks. It is not a
held-out 68-task baseline.

| Archive | Variant | Trajectories | Val full-credit | Val mean partial |
| --- | --- | ---: | ---: | ---: |
| qwen_synthetic30v15_seed_trajectories.zip | seed | 36 (21 train + 15 val) | 1/15 (6.7%) | 0.2349933333 |
| qwen_synthetic30v15_if-001_trajectories.zip | if-001 | 36 (21 train + 15 val) | 2/15 (13.3%) | 0.3243400000 |

**Only the validation column is a score.** The 30 synthetic training tasks have
no verifiers; their recorded score is a dummy constant zero, labelled in each
`result.json` as `UNGRADED: constant zero; use trajectories, not scores`. A
combined 36-task accuracy would therefore be meaningless, and none is given.
Validation figures come from the variant records in
`shadow_evolution_osworld_v2_qwen_synthetic30v15.db`.

**Nine training tasks are missing from both archives**: `s_003`, `s_010`,
`s_011`, `s_013`, `s_016`, `s_020`, `s_022`, `s_027`, `s_028`. These are exactly
the nine synthetic tasks that drive a web application, and all nine failed
environment setup on every attempt in both rounds, producing no trajectory at
all. The cause was a defect in the imported task package, since fixed: the web
task configs never launched Chrome, so setup could not reach it over CDP. Both
variants in this experiment were therefore evolved and evaluated against 21 of
30 training trajectories, all of them desktop-only. The validation gain from
seed to if-001 should not be read as evidence about browser tasks.

The recorded run uses Qwen3.8-27B for both the builder and the task agent
through OpenRouter/novita with fallbacks disabled, the Prime Agent harness, an
interface-declared context window, 300 agent steps and a two-hour wall-clock
limit per task, and a linear mutation-only route with latest-parent selection.