---
type: "Evidence Item"
title: "Claude Opus 5.5: complex coding and professional agents"
description: "Anthropic reports better performance on difficult coding and professional tasks, with typical running costs below Opus 5. It positions Opus 5.5 as its general starting point for."
resource: "https://www.anthropic.com/claude-opus-5-5"
tags: ["appendix-iii", "vendor", "anthropic"]
timestamp: "2026-09-22"
category: "vendor"
publisher: "Anthropic"
cope_score: 76
confidence: 0.85
---

# Claude Opus 5.5: complex coding and professional agents

# Claim

Anthropic reports better performance on difficult coding and professional tasks, with typical running costs below Opus 5. It positions Opus 5.5 as its general starting point for demanding workloads.

# Relevance

Appendix III, sections one and two: model capability and vendor threshold evidence

# Oracle Verdict

This release strengthens a broadly usable agent tier. Vendor case studies support further evaluation but do not independently establish productivity gains across occupations.

# Metadata

* Publisher: Anthropic
* Category: vendor
* Sector: General AI capability
* Capability: Agentic coding and professional task execution
* Cope score: 76
* Confidence: 0.85

# Related Concepts

* [Live evidence index](index.md)
* [Thesis](../thesis.md)

# Citations

[1] [Claude Opus 5.5: complex coding and professional agents](https://www.anthropic.com/claude-opus-5-5)