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Claude Opus 6

Last updated 2026-08-06 · Reviewed by ToolForge Editorial

Anthropic's flagship reasoning model, 2026 release

★ 4.8 · Flagship model for Claude Max and Claude API traffic · Since 2026 (Anthropic) · Yes (limited Opus 6 access on Claude Free)

$45 $45 / 1M output tokens (API); included in Claude Max plans

Try Claude Opus 6 → Read full review

Anthropic's deepest reasoning model to date

Claude Opus 6 is Anthropic's 2026 flagship, replacing Claude Opus 5.2 at the top of the Anthropic stack. It extends the multi-hour agentic and long-context work Anthropic has been pushing, with a particular jump in end-to-end software engineering, scientific reasoning, and long-form synthesis. Opus 6 ships in Claude.ai, the Claude API, Amazon Bedrock, and Google Cloud Vertex AI.

Who it's for: Software teams running long agentic workflows, researchers pushing on frontier reasoning, and enterprises already standardized on Claude via Bedrock or Vertex.

Key features

Brain Agentic engineering

Reliably completes multi-hour software tasks end-to-end — writing code, running tests, reading logs, and iterating — with far fewer interventions than Opus 5.2.

Book Expanded context

Effective long-context retrieval has been pushed significantly past the previous generation, with much stronger performance at the deep end of the window.

Sigma Frontier benchmarks

Posts best-in-class scores on SWE-bench Verified, GPQA Diamond, and 2026 software-engineering evals at launch.

Shield Constitutional training

Built on Anthropic's updated constitutional approach with stronger refusal-curve behavior on adversarial and dual-use prompts.

The honest take

✓ What works

Best-in-class agentic coding and multi-step reasoning at launch
Long-context retrieval quality is the strongest Anthropic has shipped
Available across Claude.ai, Anthropic API, Bedrock, and Vertex AI on day one
Noticeably better at admitting uncertainty instead of hallucinating an answer

✗ What doesn't

The most expensive flagship of 2026 on a per-token basis at list pricing
Heavy reasoning mode is slow — expect multi-minute latencies on the hardest queries
Image generation remains out of scope (text + vision understanding only)
Some SWE-bench-style gains depend on Anthropic's scaffold, less on raw model skill

Verdict

The strongest single reasoning model available in mid-2026 for software engineering and long-context work, with pricing to match. Pick it when quality matters more than latency or cost.

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