Large Context Window
Processes up to 1 million tokens in a single session (currently in beta), enabling analysis of entire codebases, lengthy documents, or large data sets without truncation.
Claude Opus 4.6 is Anthropic's most capable text generation model, released on February 5, 2026. It is designed for long-horizon agentic tasks, complex reasoning, and professional knowledge work across domains such as software development, finance, and legal analysis. A defining feature of this release is its 1 million token context window, available in beta, which allows the model to process and reason over very large volumes of information within a single session. It also introduces adaptive thinking, which automatically calibrates the depth of reasoning applied based on the complexity of the task at hand. Opus 4.6 is built to handle demanding, real-world workloads with minimal human oversight. It can orchestrate teams of subagents, parallelize work across tools, and sustain long-running tasks across the full software development lifecycle from architecture through deployment. The model supports tool use and MCP server integration, making it suitable for enterprise workflows and autonomous agent pipelines. It is best suited for senior engineers, analysts, and organizations that need to delegate complex, multi-step challenges to an AI system.
High-signal model metadata in a structured two-column overview table.
The entity that provides this model.
The routed model identifier exposed by upstream providers.
The number of tokens supported by the input context window.
The number of tokens that can be generated by the model in a single request.
Whether the model's code is available for public use.
When the model was first released.
When the model's knowledge was last updated.
The providers that offer this model. This is not an exhaustive list.
Types of data this model can process.
A fuller summary of positioning, capabilities, and source-specific details for Claude 4.6 Opus.
Claude Opus 4.6 is Anthropic's most capable text generation model, released on February 5, 2026. It is designed for long-horizon agentic tasks, complex reasoning, and professional knowledge work across domains such as software development, finance, and legal analysis. A defining feature of this release is its 1 million token context window, available in beta, which allows the model to process and reason over very large volumes of information within a single session. It also introduces adaptive thinking, which automatically calibrates the depth of reasoning applied based on the complexity of the task at hand.
Opus 4.6 is built to handle demanding, real-world workloads with minimal human oversight. It can orchestrate teams of subagents, parallelize work across tools, and sustain long-running tasks across the full software development lifecycle from architecture through deployment. The model supports tool use and MCP server integration, making it suitable for enterprise workflows and autonomous agent pipelines. It is best suited for senior engineers, analysts, and organizations that need to delegate complex, multi-step challenges to an AI system.
Processes up to 1 million tokens in a single session (currently in beta), enabling analysis of entire codebases, lengthy documents, or large data sets without truncation.
Automatically adjusts the amount of reasoning effort applied based on task complexity, allocating deeper computation to harder problems and less to simpler ones.
Handles long-horizon software development tasks including architecture, implementation, and deployment, with benchmark results on Terminal-Bench 2.0 cited in the model overview.
Accepts tool definitions at inference time and can call external functions or APIs, enabling integration with custom workflows and automated pipelines.
Connects to Model Context Protocol servers, allowing the model to interact with external data sources and services through a standardized interface.
Applies multi-step reasoning across rigorous multidisciplinary tasks, with performance on Humanity's Last Exam cited as a benchmark reference in the model overview.
Performs deep, multi-step web research to locate hard-to-find information, with BrowseComp cited as a benchmark for this capability in the model overview.
Handles economically valuable tasks in domains such as finance and legal analysis, with GDPval-AA cited as a benchmark evaluation in the model overview.
Can coordinate and manage teams of subagents, parallelizing work across tools to complete complex, multi-stage tasks with minimal human intervention.
Primary API pricing shown in the same “quick compare” spirit as the reference page.
Additional usage-cost dimensions synced into the project for this model.
Places where this model is available, based on the synced detail-page metadata.
Endpoint-level provider data currently available for this model.
The configurable options currently documented for this model.
When enabled, the model will explain its thought process step-by-step before providing a final answer. This can help users understand how the model arrived at its conclusions, but may result in longer responses. Opus 4.6 uses adaptive thinking mode. The model dynamically decides when and how much to think.
Parameters currently listed by OpenRouter or the local catalog for this model.
Benchmark scores synced from the current model source and normalized into the local catalog.
| Benchmark | Score |
|---|---|
|
ARC-AGI-2
Novel abstract reasoning and pattern recognition
|
|
|
BigLaw Bench
Legal reasoning and analysis tasks
|
|
|
GPQA Diamond
PhD-level science questions (biology, physics, chemistry)
|
|
|
HLE
Questions that challenge frontier models across many domains
|
|
|
SciCode
Scientific research coding and numerical methods
|
|
|
SWE-bench Verified
Real GitHub issues requiring multi-file code fixes
|
|
|
Terminal-Bench 2.0
Agentic coding and terminal command tasks
|
Official model cards, release notes, docs, and other references synced from the source page.
Jump straight into the most relevant side-by-side comparison pages for this model.
Compare Claude 4.6 Opus and Claude 4 Sonnet across pricing, context window, capabilities, benchmarks, and API access to choose the better fit for long-context workloads versus reasoning-heavy tasks.
Compare Claude 4.6 Opus and Claude 4 Opus across pricing, context window, capabilities, benchmarks, and API access to choose the better fit for long-context workloads versus reasoning-heavy tasks.
Compare Claude 4.8 Opus and Claude 4.6 Opus across pricing, context window, capabilities, benchmarks, and API access to choose the better fit for reasoning-heavy tasks versus long-context workloads.
Compare Claude 4.7 Opus and Claude 4.6 Opus across pricing, context window, capabilities, benchmarks, and API access to choose the better fit for long-context workloads versus long-context workloads.
Compare Claude 4.6 Opus and Claude 4.5 Sonnet across pricing, context window, capabilities, benchmarks, and API access to choose the better fit for long-context workloads versus reasoning-heavy tasks.
Compare Claude 4.6 Opus and Claude 4.5 Opus across pricing, context window, capabilities, benchmarks, and API access to choose the better fit for long-context workloads versus reasoning-heavy tasks.
Claude 4.6 Opus discussions are most active in r/LocalLLaMA, r/cursor. Top Reddit threads cluster around benchmark and model-comparison threads, safety and censorship questions.
The strongest match in this snapshot has 329 upvotes and 83 comments.
Time and time again I find posts about these fine tunes that promise increased intelligence and reasoning with base models, and I continuously try them, realize they're botched, and delete them shortly after. I sometimes do resort to a lower quant since they are bigger, in this case, a 40b variant of Qwen 3.5 27b, but they seem to always let me down. I've resorted to not downloading any model with "Claude Opus 4.6" in the name.
Kudos to everyone who tries to make the foundation models more intelligent, but imo, it never works.
Note that this example is anecdotal evidence on a single prompt, but it's overall always the case of decreased intelligence when using with a local agent setup + llama.cpp in WSL2. This is irrespective of the quant as well - I've tried many.
One thing to notice however, the reasoning/thinking is significantly less, perhaps that's part of the problem.
Have any you found these better than base, ever?
The attached screenshots are:
./llama-server -hf mradermacher/Qwen3.5-27B-heretic-GGUF:Q4_K_S --temp 1.0 --top-p 0.8 --top-k 20 --min-p 0.00 --fit on --alias default --jinja --flash-attn on --ctx-size 262144 --ctx-checkpoints 256 --cache-ram -1 --cache-type-k q4_0 --cache-type-v q4_0 --threads 8 --threads-batch 16 --no-mmap
./llama-server -hf mradermacher/Qwen3.5-40B-Claude-4.6-Opus-Deckard-Heretic-Uncensored-Thinking-i1-GGUF:i1-Q3_K_S --temp 1.0 --top-p 0.8 --top-k 20 --min-p 0.00 --fit on --alias default --jinja --flash-attn on --ctx-size 131072 --ctx-checkpoints 256 --cache-ram -1 --cache-type-k q4_0 --cache-type-v q4_0 --threads 8 --threads-batch 16 --no-mmap
Anyone else here doing full-stack Next.js in Cursor and watching the Claude quota evaporate before lunch? I used to be in the same boat — massive context windows from all the components, pages, and DB logic would smoke the default limits fast.
Not anymore. I’ve been on this setup for weeks and basically never hit a wall while still getting top-tier answers. Here’s exactly what I do:
**1. .cursorrules is non-negotiable**
I keep one in the root of every project. The key line I added: “Never explain the code to me. Just output the code blocks.”
That single rule saves me thousands of output tokens a day. No more walls of “here’s what I changed and why” — just the goods.
**2. Stopped using Cursor’s built-in Claude quota**
I killed the default Cursor Pro subscription for the heavy stuff. Instead I use my own API keys and point Cursor’s “OpenAI Compatible” base URL at LLM Router Gateway.
Inside [llmrouter](https://llmrouter.app/) routing settings I set up simple tags routing like this:
* **UI & CSS tweaks**: gemini-3.1-flash → gpt-5.4-mini
* **Deep backend / complex logic**: claude-opus-4.6 → deepseek-v3.2
* **General / quick questions**: llama-4-scout
I sorted the fallback chains by speed vs intelligence. The router auto-detects the query type, so 90% of my UI polish and small fixes go to Gemini (basically free + huge context). I only actually hit Claude Opus 4.6 when I’m doing nasty database refactors or tricky architecture stuff. My Anthropic bill dropped \~70% overnight.
**3. Cmd+K for everything small**
Don’t open the full chat sidebar just to rename a variable or extract a component. Highlight the code, hit Cmd+K, let a fast model handle the inline edit. Saves a ton of tokens and feels way snappier.
That’s it. Super simple but it completely changed how much I can actually use Cursor in a day.
How are you all managing the limits? Using a Cursor Team? Or did you build your own router hacks too? Drop your setups — always looking to steal better ideas.
Also waiting for 27B ? :D
[https://huggingface.co/collections/Jackrong/qwen35-claude-46-opus-reasoning-distilled-v2](https://huggingface.co/collections/Jackrong/qwen35-claude-46-opus-reasoning-distilled-v2)
UPDATE:
Well after some testing, for a small hobby project i found B27 Q6 very capable for local inference in opencode together with [https://github.com/code-yeongyu/oh-my-openagent](https://github.com/code-yeongyu/oh-my-openagent)
Claude Opus 4.6 has a 1 million token context window, which is currently available in beta. This is the first time the Opus model family has offered a context window of this size.
Based on the metadata provided, the training date for Claude Opus 4.6 is listed as February 2026. Specific knowledge cutoff details are documented in the model's system card.
Claude Opus 4.6 is designed for demanding, long-horizon tasks including autonomous software development, enterprise workflows, financial analysis, cybersecurity, and complex research. It supports tool use and MCP server integration for agentic pipelines.
Yes. Claude Opus 4.6 accepts tool definitions at inference time and supports MCP (Model Context Protocol) server connections, allowing it to interact with external APIs, data sources, and services.
Claude Opus 4.6 is available through Anthropic's API. It is also listed on Azure AI Foundry. The API model reference documentation is available at platform.claude.com.
Continue browsing adjacent models from the same provider.