Claude Opus 4.6

Overview

Freshness note: Model capabilities, limits, and pricing can change quickly. This profile is a point-in-time snapshot last verified on April 18, 2026.

Claude Opus 4.6 launched on February 5, 2026 and is no longer Anthropic’s latest Opus release after Claude Opus 4.7 shipped on April 16, 2026. This page remains useful as a historical snapshot because many comparisons, benchmarks, and older workflows still reference Opus 4.6 directly.

Within Anthropic’s lineup, Sonnet was usually the cost-performance default while Opus 4.6 was the premium option when reliability on hard tasks mattered more than raw speed. It was designed for high-stakes knowledge work: multi-step planning, deep code changes, long-context analysis, and tool-driven workflows.

Capabilities

Opus 4.6 was strongest when tasks required sustained coherence over many steps:

• Complex reasoning with fewer dropped constraints across long prompts.
• Strong coding performance for large refactors, bug isolation, and architecture-sensitive changes.
• Better long-horizon tool use, including function/tool loops that need planning and recovery.
• High-quality instruction following for structured responses and policy-constrained workflows.
• Solid multimodal understanding for image-plus-text analysis in docs, diagrams, and UI workflows.

In practice, teams usually routed “hard tickets” or “final pass” tasks to Opus and kept lighter workloads on cheaper models.

Technical Details

Anthropic positions Opus 4.6 as its most capable model in the Claude 4 generation. Official model docs and launch materials list:

• 200K default context window, with 1M-context beta support.
• 128K max output tokens.
• Support for text and image input, text output, and tool use.
• Hybrid reasoning, adaptive thinking, and effort controls for complex reasoning workloads.

Claude API aliasing is also relevant operationally: aliases track latest snapshots, while pinned version IDs are preferred for strict reproducibility in production.

Pricing & Access

Base API pricing (per 1M tokens) is:

• Input: $5
• Output: $25

Long-context requests above 200K input tokens are priced at higher rates. Anthropic also documents prompt-caching discounts, batch-processing discounts, and US-only inference at 1.1x pricing for eligible workloads.

Historically documented access options included:

• Anthropic API (direct) as claude-opus-4-6
• AWS Bedrock
• Google Vertex AI
• Microsoft Foundry
• Claude consumer/workspace products for interactive use

For new production work, verify whether you actually need the exact 4.6 snapshot before pinning to it. Anthropic’s current public default reference has moved to Opus 4.7.

Best Use Cases

Choose Opus 4.6 today mainly when you need to understand or reproduce older Claude 4.6-era behavior:

• Multi-file or multi-repo coding tasks with strict correctness requirements.
• Agent loops that must maintain plan integrity across many tool calls.
• Legal, compliance, or research synthesis where nuance and citation quality matter.
• Long document review with complex instruction constraints and structured output.

Less ideal use cases are new greenfield workflows where current Opus 4.7 or a cheaper Sonnet route is the better fit.

Comparisons

• Claude Opus 4.7 (Anthropic): Current premium successor with stronger coding, better vision, and improved long-running task behavior.
• Claude Sonnet 4.6 (Anthropic): Better default cost-performance route for most production traffic.
• GPT-5.4 (OpenAI): Comparable premium lane for difficult professional and agentic workflows.