Technical blog · July 2026

AI4AI at Scale: Building Open-Weight Deep Search Agents

XYZ-Aquila is a family of search agents produced by a bounded, verification-gated AI-for-AI loop: humans set the objective and acceptance gate, while AI agents optimize data, post-training, runtime, evaluation, and infrastructure inside that envelope.

Based on the slim technical report July 2026 2.8 MB PDF available for details
Benchmark overview for XYZ-Aquila across agentic search benchmarks
Overview across six of the seven evaluated agentic search benchmarks.
01 · Results

A strong efficiency frontier for Deep Search.

XYZ-Aquila-mini and XYZ-Aquila-pro are evaluated on BrowseComp, BrowseComp-ZH, DeepSearchQA, GAIA, LiveBrowseComp, Humanity’s Last Exam, and WideSearch. The external benchmark suite is isolated from the optimization loop; development decisions are made through a private, answer-hidden gate.

78.8%
BrowseComp accuracy for XYZ-Aquila-mini.
<40B leader
89.5%
DeepSearchQA F1 for XYZ-Aquila-mini.
evidence aggregation
85.1%
BrowseComp-ZH accuracy for XYZ-Aquila-pro.
open-weight group leader
81.2%
WideSearch Item F1 Max@4 for XYZ-Aquila-pro.
broad retrieval
The central claim is not that one checkpoint solved search. It is that a scoped, measured, reviewable improvement loop can turn agent development into a compounding engineering process.
Small-scale open-weight agents

XYZ-Aquila-mini leads every reported benchmark in the <40B comparison.

ModelBrowseCompBrowseComp-ZHDeepSearchQAGAIALiveBrowseCompHLEWideSearch
Agents-A175.596.029.6†47.6
Nex-N2-mini74.179.6†87.2†41.4†37.1†62.0
apodex-mini71.580.682.232.8†46.8
MiroThinker 1.7 mini67.980.334.9†36.473.3†
XYZ-Aquila-mini78.882.989.597.148.751.180.8

Percentages are reported from the slim technical report. DeepSearchQA uses F1; WideSearch uses Item F1 Max@4. † denotes reproduced results in the report’s evaluation setup.

Large-scale comparison

XYZ-Aquila-pro is competitive at sub-400B scale.

ModelBrowseCompBrowseComp-ZHDeepSearchQALiveBrowseCompHLEWideSearch
Nex-N2-Pro83.779.6†92.3†50.4†50.0†75.6
MiroThinker 1.774.075.334.1†42.9
apodex-1.075.582.684.649.0
XYZ-Aquila-pro84.885.192.553.753.381.2
apodex-h190.384.194.460.8
Kimi-K2.6 (1T)83.292.531.755.580.8
GPT-5.5 xhigh84.452.2
02 · AI4AI

Recursive improvement, bounded by design.

AI4AI uses agents to improve an agentic system, but does not hand over the objective. Humans define goals, proxy benchmarks, resource envelopes, risk boundaries, and acceptance criteria. AI agents propose and execute scoped interventions, while the evaluator returns metrics and diagnostics without exposing answer keys or private labels.

The loop is recursive, but not open-ended. Accepted and rejected attempts both become auditable experience, turning development memory into an asset rather than a pile of disconnected experiments.

AI4AI process figure

A bounded AI4AI loop keeps optimization broad enough to improve the system and narrow enough to inspect.

01
Set the contractDefine target capability, benchmarks, tools, budgets, and acceptance gates.
02
Diagnose failuresAgents analyze traces, logs, reviewer comments, costs, and reliability signals.
03
Propose changesCandidates touch data, SFT, runtime, context policy, infrastructure, or screened RL.
04
Gate adoptionAn isolated evaluator measures candidates without revealing private labels or answer keys.
05
Bank experienceAccepted and rejected attempts are retained with provenance and decision status.
03 · System

XYZ-Aquila is a system configuration, not only a model checkpoint.

Each released agent combines a selected backbone, graph-grounded data construction, state-faithful supervised post-training, a fixed three-tool execution protocol, context management, replay infrastructure, and a versioned evaluation gate.

Data intervention pipeline
Data

Graph-grounded and tool-reachable tasks.

AI4AI steers task construction toward questions that can be solved through observable search behavior, not memorized answers. The answer-hidden contract keeps rollout agents away from evaluator-side labels.

Post-training intervention pipeline
Post-training

State-faithful SFT for long traces.

Training examples are aligned to the exact visible state at each turn, preserving the decisions the agent actually faced while supporting long-sequence packing and context-managed rollouts.

Harness intervention pipeline
Runtime

Fixed interface, exact replay.

The agent can call search, scrape, and python under fixed semantics, visible-context limits, and turn budgets. Runtime and replay improvements are allowed only when they improve observability or execution without strengthening the task interface.

Tool use by benchmark
Behavior

Adaptive tool use emerges across benchmarks.

Retrieval-heavy tasks emphasize search; GAIA and DeepSearchQA use more extraction and computation. Strong search agents need flexible tool allocation, not a fixed interaction template.

04 · Boundaries

What is adopted, what is screened, and what remains open.

The released XYZ-Aquila-mini and XYZ-Aquila-pro systems include the adopted data, SFT, runtime, context, and replay interventions. A process-reward RL design is screened as a promising extension, but it is not counted as part of the reported release because it has not completed the full training-and-gate path.

Three principles keep the loop honest.

Isolation.

External benchmarks stay outside the optimization state and are used for final or explicitly authorized evaluation.

Invariance.

Candidate gains cannot come from extra tools, larger visible context, or larger turn budgets.

Auditability.

Every supervised or analyzed decision is tied to the exact visible state available at that step.

Limitations and future work

The technical report is explicit about remaining work: finer ablations are needed to quantify each intervention class; cost and latency should be reported more completely; live web benchmarks are dated observations; and the RL layer needs broader validation. The same discipline that produced the current systems should guide the next phase: define the scope, run the gate, preserve the evidence, and report what changed.