Claude Opus 4.6

About Claude Opus 4.6

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 for large codebases, complex refactors, and multi-step debugging that unfolds over time. The model shows deeper contextual understanding, stronger problem decomposition, and greater reliability on hard engineering tasks than prior generations. Beyond coding, Opus 4.6 excels at sustained knowledge work. It produces near-production-ready documents, plans, and analyses in a single pass, and maintains coherence across very long outputs and extended sessions. This makes it a strong default for tasks that require persistence, judgment, and follow-through, such as technical design, migration planning, and end-to-end project execution. For users upgrading from earlier Opus versions, see our [official migration guide here](https://openrouter.ai/docs/guides/guides/model-migrations/claude-4-6-opus)

Model Specifications

💰 Real-World Cost Examples

Estimated monthly costs for common use cases

Anthropic Model Lineup

Compare all models from Anthropic to find the best fit

Similar Models from Other Providers

Cross-brand alternatives with similar capabilities

GPT Chat Latest

OpenAI

Input: $5.00

Output: $30.00

Context: 400k

GPT-5.6 Sol Pro

OpenAI

Input: $5.00

Output: $30.00

Context: 1.1M

GPT-5.6 Sol

OpenAI

Input: $5.00

Output: $30.00

Context: 1.1M

Fugu Ultra

Sakana

Input: $5.00

Output: $30.00

Context: 1.0M

💡 Cheaper Alternatives

Same Brand (Anthropic)

Cross Brand

🚀 Quick Start

Get started with Claude Opus 4.6 API

import anthropic

client = anthropic.Anthropic()

message = client.messages.create(
    model="anthropic/claude-4.6-opus-20260205",
    max_tokens=1024,
    messages=[
        {"role": "user", "content": "Hello!"}
    ]
)
print(message.content[0].text)

Continue Your Decision