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Claude Opus 4.6

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Adopt

Claude Opus 4.6, released February 5, 2026, is Anthropic's most capable model — designed for complex, long-horizon tasks that require sustained autonomous reasoning. It is the recommended choice for multi-hour agentic workflows, complex architecture work, and tasks where quality matters more than cost.

Architecture Deep Dive → Claude Opus 4.6 Architecture Breakdown — 1M context window design, adaptive thinking / extended reasoning, context compaction mechanism, and how the architecture differs from GPT-5.4.

Why It's in Adopt

Claude Opus 4.6 is the model to reach for when task complexity justifies the cost. Anthropic designed it specifically for agentic use cases where an AI works "autonomously for hours" — and the design shows:

  • Extended autonomous operation: Maintains coherence and follows constraints reliably across long multi-step tasks, outperforming other models on task completion in extended agentic sessions
  • Prompt injection resistance: Significantly stronger defences against malicious instructions injected through tool outputs — critical when agents are reading untrusted content
  • Computer use: State-of-the-art GUI automation (clicking, typing, navigating browsers) — Anthropic's most capable implementation
  • Superior instruction following: Stays within boundaries set in the system prompt even under pressure from adversarial content

Performance

Benchmark Score
SWE-bench Verified ~74%
GPQA Diamond ~91.3%
AIME 2026 93.3
ARC-AGI-2 Leading proprietary model scores

Claude Sonnet 4.6 (already on this radar) delivers near-Opus performance at Sonnet pricing for most coding tasks — Opus is the right choice when you need the last few percentage points of reliability on complex autonomous tasks.

When to Use Opus vs Sonnet 4.6

Use Sonnet 4.6 Use Opus 4.6
Most coding tasks Complex multi-day autonomous agents
Routine code generation Architecture decisions requiring deep reasoning
Cost-sensitive production usage High-stakes or irreversible operations
Batch processing at scale Tasks needing maximum prompt injection resistance

Pricing

Property Value
Input $5 per million tokens
Output $25 per million tokens
Context window 1,000,000 tokens
Max output 32,000 tokens

Prompt caching reduces costs by up to 90% on repeated context — essential for long agentic sessions that repeatedly re-read large codebases.

How to Access

  • Claude.ai — available on Pro and higher plans
  • Anthropic API — claude-opus-4-6 model ID
  • Amazon Bedrock and Google Vertex AI — for enterprise deployments
  • Claude Code — available as an alternative to the default Sonnet model

Key Characteristics

Property Value
Context window 1,000,000 tokens (1M)
Max output 32,000 tokens
Input pricing $5 per million tokens
Output pricing $25 per million tokens
Provider Anthropic
API model ID claude-opus-4-6
Release date February 5, 2026

Further Reading