Anthropic

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.

Feb 04, 2026 1M context 128,000 tokens output
Large Context Window Adaptive Thinking Agentic Coding Tool Use MCP Server Support Complex Reasoning

Model Overview

High-signal model metadata in a structured two-column overview table.

Provider

The entity that provides this model.

Anthropic

Model ID

The routed model identifier exposed by upstream providers.

anthropic/claude-opus-4.6

Input Context Window

The number of tokens supported by the input context window.

1M tokens

Maximum Output Tokens

The number of tokens that can be generated by the model in a single request.

128,000 tokens tokens

Open Source

Whether the model's code is available for public use.

No

Release Date

When the model was first released.

Feb 04, 2026 4 months ago

Knowledge Cut-off Date

When the model's knowledge was last updated.

February 2026

API Providers

The providers that offer this model. This is not an exhaustive list.

Google, Amazon Bedrock, Azure, Anthropic

Modalities

Types of data this model can process.

Text Image File

What is Claude 4.6 Opus

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.

Capabilities

What Claude 4.6 Opus supports

CTX

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.

AI

Adaptive Thinking

Automatically adjusts the amount of reasoning effort applied based on task complexity, allocating deeper computation to harder problems and less to simpler ones.

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Agentic Coding

Handles long-horizon software development tasks including architecture, implementation, and deployment, with benchmark results on Terminal-Bench 2.0 cited in the model overview.

TL

Tool Use

Accepts tool definitions at inference time and can call external functions or APIs, enabling integration with custom workflows and automated pipelines.

MCP

MCP Server Support

Connects to Model Context Protocol servers, allowing the model to interact with external data sources and services through a standardized interface.

RN

Complex Reasoning

Applies multi-step reasoning across rigorous multidisciplinary tasks, with performance on Humanity's Last Exam cited as a benchmark reference in the model overview.

AG

Agentic Web Search

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.

AI

Professional Knowledge Work

Handles economically valuable tasks in domains such as finance and legal analysis, with GDPval-AA cited as a benchmark evaluation in the model overview.

AG

Subagent Orchestration

Can coordinate and manage teams of subagents, parallelizing work across tools to complete complex, multi-stage tasks with minimal human intervention.

Pricing for Claude 4.6 Opus

Primary API pricing shown in the same “quick compare” spirit as the reference page.

Price Comparison

Additional usage-cost dimensions synced into the project for this model.

Web search $10000.00
Cache read $0.50
Cache write $6.25
maxTemperature 1
maxResponseSize 128,000 tokens

API Access & Providers

Places where this model is available, based on the synced detail-page metadata.

Google Amazon Bedrock Azure Anthropic

Provider Endpoints

Endpoint-level provider data currently available for this model.

Google

Max output: 128,000 Supported params: 10 Implicit caching: No

Amazon Bedrock

Max output: 128,000 1d uptime: 100.0% Supported params: 12 Implicit caching: No

Azure

Max output: 128,000 Supported params: 13 Implicit caching: No

Anthropic

Max output: 128,000 1d uptime: 100.0% Supported params: 11 Implicit caching: No

Google

Max output: 128,000 1d uptime: 100.0% Supported params: 10 Implicit caching: No

Anthropic

Max output: 128,000 1d uptime: 99.5% Supported params: 11 Implicit caching: No

Configuration & Parameters

The configurable options currently documented for this model.

Reasoning

Select

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.

Default: false
Disabled Enabled

Supported Request Parameters

Parameters currently listed by OpenRouter or the local catalog for this model.

Reasoning

Model Performance

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
68.8%
BigLaw Bench
Legal reasoning and analysis tasks
90.2%
GPQA Diamond
PhD-level science questions (biology, physics, chemistry)
84.0%
HLE
Questions that challenge frontier models across many domains
18.6%
SciCode
Scientific research coding and numerical methods
45.7%
SWE-bench Verified
Real GitHub issues requiring multi-file code fixes
80.8%
Terminal-Bench 2.0
Agentic coding and terminal command tasks
65.4%

Resources & Documentation

Official model cards, release notes, docs, and other references synced from the source page.

Compare Claude 4.6 Opus with related models

Jump straight into the most relevant side-by-side comparison pages for this model.

Claude 4.6 Opus vs Claude 4 Sonnet

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.

Claude 4.6 Opus vs Claude 4 Opus

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.

Claude 4.8 Opus vs Claude 4.6 Opus

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.

Claude 4.7 Opus vs Claude 4.6 Opus

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.

Claude 4.6 Opus vs Claude 4.5 Sonnet

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.

Claude 4.6 Opus vs Claude 4.5 Opus

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.

Community discussion

What people think about Claude 4.6 Opus

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.

r/LocalLLaMA 272 upvotes 123 comments April 14, 2026
These "Claude-4.6-Opus" Fine Tunes of Local Models Are Usually A Downgrade

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

Open Reddit thread

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.

Open Reddit thread
r/LocalLLaMA 207 upvotes 77 comments March 18, 2026
Let's GO ! Qwen3.5-Claude-4.6-Opus-Reasoning-Distilled-v2

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)

Open Reddit thread
View more discussions →
FAQ

Common questions about Claude 4.6 Opus

What is the context window size for Claude Opus 4.6?

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.

What is the training data cutoff for Claude Opus 4.6?

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.

What types of tasks is Claude Opus 4.6 best suited for?

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.

Does Claude Opus 4.6 support tool use and external integrations?

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.

Where can I access Claude Opus 4.6 via API?

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.

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