Extended Reasoning With Long Horizon Planning

via “long-horizon task planning”

GLM-5: Targeting complex systems engineering and long-horizon agentic tasks

Unique: Utilizes a hierarchical task decomposition model that allows for context retention across long sequences, enhancing its ability to manage complex projects.

vs others: More effective than traditional planning tools because it maintains context over extended interactions, unlike many linear models.

via “multi-horizon and scenario-based forecasting”

** - Predict anything with Chronulus AI forecasting and prediction agents.

Unique: Implements multi-horizon and scenario-based forecasting as agent-callable capabilities, allowing agents to request predictions across different time horizons and under different assumptions; uses horizon-specific model selection and scenario branching to provide contextually appropriate forecasts.

vs others: More flexible than single-horizon forecasting because it supports strategic planning use cases; enables agents to explore multiple futures (scenarios) rather than committing to a single prediction path.

via “long-horizon objective pursuit with intermediate milestone tracking”

LLM-powered lifelong learning agent in Minecraft

Unique: Maintains explicit milestone tracking for long-horizon objectives, enabling the agent to decompose distant goals into achievable intermediate steps and detect when progress stalls. Milestones serve as both planning anchors and progress checkpoints.

vs others: More effective than single-step planning for long-horizon tasks because milestones provide intermediate feedback and enable replanning; more interpretable than end-to-end RL because milestone progress is explicitly tracked and reported.

via “extended reasoning with long-horizon planning”

Kimi K2 Thinking is Moonshot AI’s most advanced open reasoning model to date, extending the K2 series into agentic, long-horizon reasoning. Built on the trillion-parameter Mixture-of-Experts (MoE) architecture introduced in...

Unique: Trillion-parameter MoE architecture enables reasoning chains to scale without the token-collapse problem seen in dense models; K2 Thinking extends the K2 series specifically for agentic long-horizon tasks rather than generic reasoning, suggesting specialized routing and attention patterns for multi-step planning

vs others: Maintains reasoning coherence across longer planning horizons than o1-preview due to MoE sparse activation, while offering lower latency than o1 for moderate-complexity tasks through optimized routing

via “agentic reasoning with extended planning horizons”

Opus 4.6 is Anthropic’s strongest model for coding and long-running professional tasks. It is built for agents that operate across entire workflows rather than single prompts, making it especially effective...

Unique: Opus 4.6 uses a training approach specifically optimized for agent workflows rather than chat, with explicit optimization for multi-step reasoning and tool use. The model's RLHF training includes examples of agents backtracking, re-evaluating decisions, and adapting to new information — capabilities that are secondary in chat-optimized models.

vs others: Stronger than GPT-4 and Claude 3.5 Sonnet at maintaining coherent multi-step plans because it was trained on agent-specific tasks rather than general chat, resulting in better strategy adaptation and fewer planning failures.

via “reasoning-and-planning-with-extended-chain-of-thought”

Compared with GLM-4.5, this generation brings several key improvements: Longer context window: The context window has been expanded from 128K to 200K tokens, enabling the model to handle more complex...

Unique: Extended context window enables multi-page chain-of-thought reasoning without truncation, allowing the model to explore multiple reasoning paths, backtrack, and reconsider assumptions within a single generation rather than requiring multiple API calls

vs others: Produces more transparent and verifiable reasoning than models with shorter context windows because it can maintain full reasoning history; enables human-in-the-loop validation of intermediate steps rather than just final answers

via “extended-reasoning-chain-of-thought-generation”

o3 is a well-rounded and powerful model across domains. It sets a new standard for math, science, coding, and visual reasoning tasks. It also excels at technical writing and instruction-following....

Unique: Implements internal extended thinking with computational budget allocation — the model allocates more inference compute to reasoning phases before answer generation, unlike standard LLMs that generate reasoning and answers in a single forward pass. This is achieved through a two-phase architecture where reasoning tokens are generated in a hidden reasoning phase before final output.

vs others: Outperforms GPT-4 and Claude 3.5 on math olympiad problems and complex reasoning tasks by 15-40% due to extended thinking budget, but at significantly higher latency and cost than standard models

via “long-context-reasoning-over-extended-documents”

The latest and strongest model family from OpenAI, o1 is designed to spend more time thinking before responding. The o1 model series is trained with large-scale reinforcement learning to reason...

Unique: Applies learned reasoning patterns to identify and synthesize information across long contexts, rather than applying uniform attention to all sections. The model learns which parts of long documents are relevant to reasoning queries and how to synthesize across distant sections.

vs others: Handles long-document reasoning better than standard LLMs because it learns to prioritize relevant sections and reason about relationships, but remains slower and more expensive than specialized document retrieval systems for simple lookup tasks.

via “long-context reasoning with mixture-of-experts architecture”

Cogito v2.1 671B MoE represents one of the strongest open models globally, matching performance of frontier closed and open models. This model is trained using self play with reinforcement learning...

Unique: Uses self-play reinforcement learning during training to optimize reasoning behavior, creating emergent multi-step problem-solving patterns not present in supervised-only models. The 671B MoE design activates only necessary expert pathways per token, enabling frontier-class reasoning at lower per-token computational cost than dense equivalents.

vs others: Matches frontier closed-model reasoning quality while maintaining the efficiency benefits of sparse MoE routing, positioning it as a cost-effective alternative to GPT-4 or Claude 3.5 for reasoning-heavy workloads when accessed via OpenRouter.

via “extended-context-reasoning-with-sparse-activation”

Tongyi DeepResearch is an agentic large language model developed by Tongyi Lab, with 30 billion total parameters activating only 3 billion per token. It's optimized for long-horizon, deep information-seeking tasks...

Unique: Uses a 30B parameter MoE architecture with 3B active parameters per token, a design choice that balances reasoning capability with inference efficiency. This is distinct from dense 30B models and from smaller 7B-13B models — it achieves reasoning depth closer to 30B while maintaining latency closer to 7B.

vs others: More efficient than dense 30B models for long-horizon tasks (lower latency, lower memory), and more capable than 7B-13B models for complex reasoning, making it a sweet spot for research-heavy applications.

via “extended-chain-of-thought reasoning with configurable effort levels”

OpenAI o4-mini-high is the same model as [o4-mini](/openai/o4-mini) with reasoning_effort set to high. OpenAI o4-mini is a compact reasoning model in the o-series, optimized for fast, cost-efficient performance while retaining...

Unique: Uses a dedicated high reasoning_effort mode that explicitly allocates extended computational budget to internal reasoning phases, distinct from standard LLM inference. The architecture separates reasoning computation from response generation, allowing the model to perform deeper verification and multi-path exploration before committing to an answer.

vs others: Provides deeper reasoning than GPT-4 Turbo or Claude 3.5 Sonnet by design, but at higher latency and cost; positioned for accuracy-critical reasoning tasks where inference time is less constrained than response quality.

via “complex-query-answering-with-reasoning”

Trinity Large Thinking is a powerful open source reasoning model from the team at Arcee AI. It shows strong performance in PinchBench, agentic workloads, and reasoning tasks. Launch video: https://youtu.be/Gc82AXLa0Rg?si=4RLn6WBz33qT--B7

Unique: Applies extended reasoning to open-ended question answering, enabling the model to decompose complex questions, explore multiple reasoning paths, and synthesize coherent answers that account for nuance and trade-offs. This goes beyond retrieval-based QA by enabling inference and reasoning.

vs others: Outperforms standard LLMs on complex, multi-faceted questions because reasoning tokens allow exploration of implications and trade-offs; more thorough than simple retrieval systems because it can reason beyond stored facts.

via “scaling reasoning models to longer chains”

A guide to building a working reasoning model from the ground up, by Sebastian Raschka.

Unique: Treats chain length scaling as a distinct architectural problem requiring specialized attention patterns and memory mechanisms rather than assuming standard transformer scaling applies to reasoning

vs others: Specifically addresses reasoning-specific scaling challenges; more targeted than generic long-context techniques designed for document understanding