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arxiv: 2602.08392 · v2 · submitted 2026-02-09 · 💻 cs.RO · cs.AI· cs.CV

Recognition: 2 theorem links

· Lean Theorem

ST-BiBench: Benchmarking Multi-Stream Multimodal Coordination in Bimanual Embodied Tasks for MLLMs

Authors on Pith no claims yet

Pith reviewed 2026-05-16 05:56 UTC · model grok-4.3

classification 💻 cs.RO cs.AIcs.CV
keywords bimanual coordinationmultimodal large language modelsembodied AIspatial groundingaction synthesismultimodal fusioncoordination paradox
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The pith

Multimodal models plan bimanual tasks well but fail at precise physical execution

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper introduces ST-BiBench as a benchmark to test multimodal large language models on coordinated two-handed actions in embodied settings. It separates evaluation into high-level strategic planning across streams, basic spatial awareness for arm selection, and direct output of continuous actions. Tests across more than thirty current models reveal consistent success at logic-driven strategy alongside frequent breakdowns when aligning plans with visual details and motor outputs. The work identifies this as a coordination paradox caused by interference when fusing multiple perception and action streams. If the pattern holds, it shows that current models cannot yet support reliable dual-arm robotic tasks without fixes to how they integrate modalities.

Core claim

ST-BiBench reveals a persistent coordination paradox in which state-of-the-art MLLMs achieve strong performance on high-level strategic coordination planning yet suffer from perception-logic disconnection and multi-stream interference when performing foundational spatial grounding or synthesizing 16-dimensional continuous actions.

What carries the argument

ST-BiBench, a multi-tier evaluation framework that measures Strategic Coordination Planning, Foundational Spatial Grounding, and Fine-Grained Action Control to expose gaps in multi-stream multimodal fusion.

Load-bearing premise

That the chosen tasks and metrics isolate multi-stream interference and spatial misalignment without confounding effects from how visual inputs are rendered or actions are scored.

What would settle it

Running the fine-grained action control tier on a model that scored high on strategic planning and checking whether arm-selection errors or trajectory deviations remain high despite the strong planning scores.

Figures

Figures reproduced from arXiv: 2602.08392 by Mengkang Hu, Xin Wu, Xiu Li, Yue Ma, Zhixuan Liang, Zhiyuan Qin.

Figure 1
Figure 1. Figure 1: Overview of ST-BiBench. An evaluation framework for MLLMs in bimanual manipulation, spanning three parts: Strategic Coordination Planning, Foundational Spatial Grounding and Fine-Grained Action Control. To address this, we introduce ST-BiBench, a multi￾granularity framework designed to evaluate the spatio￾temporal multimodal coordination of MLLMs (Fig. ??). At the heart of our framework is Strategic Coordi… view at source ↗
Figure 2
Figure 2. Figure 2: Overview of the ST-BiBench agent architecture: A hierarchical framework for multi-stream input fusion and tiered action execution, [PITH_FULL_IMAGE:figures/full_fig_p006_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: Comparison of error type distributions. Analysis of [PITH_FULL_IMAGE:figures/full_fig_p009_3.png] view at source ↗
Figure 1
Figure 1. Figure 1: High-quality reasoning example. Foundational Spatial Grounding Example { "visual_state_description": "The image shows a first-person perspective from a dual-arm robot. There are two white robotic arms, one on the left and one on the right. In front of the robot is a brown table with three colored cubes. A red cube is located on the left side of the table, a green cube is in the center, and a blue cube is o… view at source ↗
Figure 2
Figure 2. Figure 2: Average-quality reasoning example with spatial ambiguity. [PITH_FULL_IMAGE:figures/full_fig_p019_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: Low-quality reasoning example with significant visual hallucination. [PITH_FULL_IMAGE:figures/full_fig_p019_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: Strategic Coordination Planning Success example of Gemini-2.5-Pro: Handover [PITH_FULL_IMAGE:figures/full_fig_p023_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: Strategic Coordination Planning Failed example of GPT-5: Place [PITH_FULL_IMAGE:figures/full_fig_p025_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: Fine-Grained Action Control Success example of GPT-5: Stack [PITH_FULL_IMAGE:figures/full_fig_p027_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: Fine-Grained Action Control Failed example of InternVL3-78B: Place [PITH_FULL_IMAGE:figures/full_fig_p030_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: Visualization of Observation Space. The left panel (a) shows the ego-centric view subject to occlusion during interaction. The right panel (b) displays the third-person view, which provides global context and is utilized to mitigate occlusion in Strategic Coordination Planning and selected Fine-Grained Action Control tasks. You are a dual-arm robot manipulation assistant. You are designed to finish dual-ar… view at source ↗
Figure 9
Figure 9. Figure 9: Strategic Coordination Planning example in img form: Blocks [PITH_FULL_IMAGE:figures/full_fig_p038_9.png] view at source ↗
read the original abstract

Multimodal Large Language Models (MLLMs) have significantly advanced the landscape of embodied AI, yet transitioning to synchronized bimanual coordination introduces formidable challenges in multi-stream multimodal integration. We introduce ST-BiBench, a comprehensive multi-tier framework for evaluating spatio-temporal multimodal coordination. Our approach centers on Strategic Coordination Planning, assessing high-level cross-modal reasoning over multiple action and perception streams. To investigate the "proximity paradox"-where semantically coherent plans fail to align with spatially grounded visual inputs-we incorporate Foundational Spatial Grounding to verify workspace awareness and arm-selection logic. Furthermore, we probe model frontiers through Fine-Grained Action Control, investigating whether MLLMs can directly synthesize high-dimensional continuous action modalities (16-Dim) from complex multimodal metadata. Evaluating 30+ state-of-the-art MLLMs, we uncover a persistent and pervasive "coordination paradox"-a significant gap between high-level strategic reasoning and fine-grained physical execution. Results reveal that while frontier MLLMs excel at logic-driven strategy, they frequently suffer from perception-logic disconnection and multi-stream interference during multimodal fusion. ST-BiBench provides a platform for identifying critical bottlenecks in multi-stream multimodal fusion and cross-modal alignment for complex embodied tasks.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 2 minor

Summary. The paper introduces ST-BiBench, a multi-tier benchmark framework for evaluating spatio-temporal multimodal coordination in bimanual embodied tasks for MLLMs. It assesses three components: Strategic Coordination Planning for high-level cross-modal reasoning, Foundational Spatial Grounding to address the proximity paradox in workspace awareness and arm selection, and Fine-Grained Action Control for synthesizing 16-dimensional continuous actions from multimodal inputs. Evaluation of over 30 state-of-the-art MLLMs reveals a persistent coordination paradox, with strong performance on logic-driven strategy but failures due to perception-logic disconnection and multi-stream interference during fusion.

Significance. If the benchmark tasks and metrics are demonstrated to isolate multi-stream effects without confounding artifacts, this work would be significant for embodied AI by providing a standardized platform to diagnose bottlenecks in MLLM multimodal fusion and cross-modal alignment for complex bimanual scenarios, potentially guiding targeted improvements in perception-action integration.

major comments (2)
  1. [Abstract and §4] Abstract and §4 (Fine-Grained Action Control): The central claim of a coordination paradox between high-level strategic reasoning and 16-Dim physical execution rests on the assumption that ST-BiBench metrics isolate multi-stream interference; however, no ablations are reported on action scoring tolerances (exact-match vs. continuous distance thresholds) or visual rendering choices (fixed camera views in bimanual workspaces), raising the possibility that observed failures stem from format/viewpoint artifacts rather than fusion limitations.
  2. [§3 and evaluation tables] §3 (Benchmark Design) and evaluation tables: The paper reports results across 30+ models but provides no quantitative tables with error bars, task-specific success rates, or exclusion criteria for model responses; without these, the magnitude and statistical robustness of the reported gap cannot be verified, weakening the claim of pervasiveness.
minor comments (2)
  1. [Introduction] The distinction between the 'proximity paradox' and 'coordination paradox' is introduced in the abstract but not explicitly contrasted in the introduction or related work sections; a clarifying sentence would improve readability.
  2. [Methods] Notation for the 16-Dim action space is used without an explicit definition or example vector in the methods; adding this would aid reproducibility.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the constructive and detailed feedback. We address each major comment below and describe the revisions we will incorporate to strengthen the manuscript.

read point-by-point responses
  1. Referee: [Abstract and §4] Abstract and §4 (Fine-Grained Action Control): The central claim of a coordination paradox between high-level strategic reasoning and 16-Dim physical execution rests on the assumption that ST-BiBench metrics isolate multi-stream interference; however, no ablations are reported on action scoring tolerances (exact-match vs. continuous distance thresholds) or visual rendering choices (fixed camera views in bimanual workspaces), raising the possibility that observed failures stem from format/viewpoint artifacts rather than fusion limitations.

    Authors: We agree that explicit ablations on scoring tolerances and rendering choices would more rigorously demonstrate isolation of multi-stream effects. Our current metrics follow standard practices in continuous-action embodied benchmarks, and the failure patterns are consistent across model families, but we acknowledge this does not fully rule out artifacts. In the revised version we will add targeted ablations varying exact-match versus distance-based thresholds and alternative camera viewpoints to confirm that the coordination paradox is not driven by these design choices. revision: yes

  2. Referee: [§3 and evaluation tables] §3 (Benchmark Design) and evaluation tables: The paper reports results across 30+ models but provides no quantitative tables with error bars, task-specific success rates, or exclusion criteria for model responses; without these, the magnitude and statistical robustness of the reported gap cannot be verified, weakening the claim of pervasiveness.

    Authors: We accept that the current presentation lacks the requested statistical detail. The manuscript summarizes aggregate outcomes but omits per-task breakdowns, variance estimates, and response-filtering rules. We will expand §3 and the evaluation tables to include task-specific success rates, error bars computed over repeated evaluation runs, and explicit exclusion criteria (e.g., malformed outputs or format violations). These additions will allow readers to assess the robustness and pervasiveness of the observed gaps. revision: yes

Circularity Check

0 steps flagged

No significant circularity in benchmark evaluation chain

full rationale

The paper introduces a new benchmark ST-BiBench with defined tasks and metrics for bimanual coordination, then reports empirical performance of 30+ external MLLMs on it. The claimed 'coordination paradox' is an observed gap in those results, not a derived quantity that reduces to the benchmark definition by construction. No self-definitional steps, fitted inputs renamed as predictions, or load-bearing self-citations appear in the provided text. The evaluation uses independent models and is therefore self-contained against external benchmarks.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The central claim rests on the assumption that the three-tier tasks faithfully probe multi-stream coordination without the benchmark itself introducing artifacts; no free parameters are explicitly fitted in the abstract, but task design choices function as implicit parameters.

axioms (1)
  • domain assumption The chosen bimanual tasks and 16-Dim action space adequately represent real-world coordination challenges
    Invoked when claiming the observed gap is a general 'coordination paradox' rather than an artifact of the specific test suite.

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